Log in

Relevant bibliographies by topics / Chirped Raman laser / Journal articles

Journal articles on the topic 'Chirped Raman laser'

To see the other types of publications on this topic, follow the link: Chirped Raman laser.

Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Chirped Raman laser.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Kinyaevskiy, I. O., L. V. Seleznev, A. V. Koribut, E. E. Dunaeva, Yu M. Andreev, and A. A. Ionin. "Stimulated Raman scattering of chirped Ti:Sapphire laser pulses in BaWO4 crystal." Izvestiya vysshikh uchebnykh zavedenii. Fizika, no. 11 (2021): 67–70. http://dx.doi.org/10.17223/00213411/64/11/67.

Full text

Abstract:

Stimulated Raman scattering of chirped Ti:Sapphire laser pulses in BaWO4 crystal A spectrum transformation of a chirped Ti:sapphire laser pulse stretched to 0.2 ns (with initial transform limited pulse duration of 90 fs) was experimentally studied in a tandem of BaWO4 crystals. To increase stimulated Raman scattering efficiency, broadband laser emission was used as a seed of this process. Efficiency of the Stokes component generation corresponding to the BaWO4 crystal phonon mode ν1(Ag)≈925 cm-1 reached ~ 10%. Generation of the Stokes component corresponding to the weaker phonon mode ν3(Eg)≈795 cm-1, and second Stokes components of ν1(Ag) and ν3(Eg) modes were also observed. Mechanisms reducing the stimulated Raman scattering efficiency for the ν1(Ag) mode are discussed.

APA, Harvard, Vancouver, ISO, and other styles

2

Schroeder, C. B., E. Esarey, B. A. Shadwick, and W. P. Leemans. "Raman forward scattering of chirped laser pulses." Physics of Plasmas 10, no. 1 (January 2003): 285–95. http://dx.doi.org/10.1063/1.1528901.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Lanin, A. A., E. A. Stepanov, R. A. Tikhonov, D. A. Sidorov-Biryukov, A. B. Fedotov, and A. M. Zheltikov. "Multimodal nonlinear Raman microspectroscopy with ultrashort chirped laser pulses." JETP Letters 101, no. 9 (May 2015): 593–97. http://dx.doi.org/10.1134/s002136401509009x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Tian, Xin, Chenhui Gao, Chongwei Wang, Xiaofan Zhao, Meng Wang, Xiaoming Xi, and Zefeng Wang. "2.58 kW Narrow Linewidth Fiber Laser Based on a Compact Structure with a Chirped and Tilted Fiber Bragg Grating for Raman Suppression." Photonics 8, no. 12 (November 25, 2021): 532. http://dx.doi.org/10.3390/photonics8120532.

Full text

Abstract:

We report a high power, narrow linewidth fiber laser based on oscillator one-stage power amplification configuration. A fiber oscillator with a center wavelength of 1080 nm is used as the seed, which is based on a high reflection fiber Bragg grating (FBG) and an output coupling FBG of narrow reflection bandwidth. The amplifier stage adopted counter pumping. By optimizing the seed and amplifier properties, an output laser power of 2276 W was obtained with a slope efficiency of 80.3%, a 3 dB linewidth of 0.54 nm and a signal to Raman ratio of 32 dB, however, the transverse mode instability (TMI) began to occur. For further increasing the laser power, a high-power chirped and tilted FBG (CTFBG) was inserted between the backward combiner and the output passive fiber, experimental results showed that both the threshold of Stimulated Raman scattering (SRS) and TMI increased. The maximum laser power was improved to 2576 W with a signal to Raman ratio of 42 dB, a slope efficiency of 77.1%, and a 3 dB linewidth of 0.87 nm. No TMI was observed and the beam quality factor M2 maintained about 1.6. This work could provide a useful reference for obtaining narrow-linewidth high-power fiber lasers with high signal to Raman ratio.

APA, Harvard, Vancouver, ISO, and other styles

5

Dodd, Evan S., and Donald Umstadter. "Coherent control of stimulated Raman scattering using chirped laser pulses." Physics of Plasmas 8, no. 8 (August 2001): 3531–34. http://dx.doi.org/10.1063/1.1382820.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Sanders, James C., Rafal Zgadzaj, and Michael C. Downer. "Terawatt chirped pulse Raman amplified laser for two-color experiments." Optical Engineering 59, no. 07 (July 20, 2020): 1. http://dx.doi.org/10.1117/1.oe.59.7.076110.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Kinyaevskiy, I. O., L. V. Seleznev, A. V. Koribut, E. E. Dunaeva, Yu M. Andreev, and A. A. Ionin. "Stimulated Raman Scattering of Chirped Ti:Sapphire Laser Pulses in BaWO4 Crystal." Russian Physics Journal 64, no. 11 (March 2022): 2058–61. http://dx.doi.org/10.1007/s11182-022-02555-y.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Grigsby, Franklin B., Peng Dong, and Michael C. Downer. "Chirped-pulse Raman amplification for two-color, high-intensity laser experiments." Journal of the Optical Society of America B 25, no. 3 (February 20, 2008): 346. http://dx.doi.org/10.1364/josab.25.000346.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Légaré, F., S. Chelkowski, and A. D. Bandrauk. "Laser pulse control of Raman processes by chirped non-adiabatic passage." Journal of Raman Spectroscopy 31, no. 1-2 (January 2000): 15–23. http://dx.doi.org/10.1002/(sici)1097-4555(200001/02)31:1/2<15::aid-jrs495>3.0.co;2-a.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Ning, G., P. Shum, J. Q. Zhou, and L. Xia. "Multiwavelength Raman fiber laser inserting a sampled chirped fiber Bragg grating." Microwave and Optical Technology Letters 49, no. 9 (2007): 2242–45. http://dx.doi.org/10.1002/mop.22652.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Zhao, Xiaofan, Xin Tian, Meng Wang, Binyu Rao, Hongye Li, Xiaoming Xi, and Zefeng Wang. "Fabrication of 2 kW-Level Chirped and Tilted Fiber Bragg Gratings and Mitigating Stimulated Raman Scattering in Long-Distance Delivery of High-Power Fiber Laser." Photonics 8, no. 9 (September 2, 2021): 369. http://dx.doi.org/10.3390/photonics8090369.

Full text

Abstract:

Chirped and tilted fiber Bragg gratings (CTFBGs) have attracted a lot of attention in stimulated Raman scattering (SRS) suppression of high-power fiber lasers. However, the laser power handling capacity seriously limits their applications. In this paper, by optimizing the inscription parameters and post-processing strategy, we fabricate a large-mode-area double-cladding CTFBG with a thermal slope of ~0.015 °C/W due to the low insertion loss of about 0.15 dB, which make it possible for direct kilowatt-level application. A 2 kW-level fiber laser oscillator is employed to test the CTFBG, and a series of experiments have been carried out to compare the effect of SRS mitigation in high-power fiber laser long-distance delivery. In addition, the influence of CTFBGs on laser beam quality is studied for the first time. Experimental results indicated that the CTFBG could effectively mitigate SRS and has no obvious influence on laser beam quality. This work opens a new opportunity for further power scaling and the delivery of high-power fiber lasers over longer distances.

APA, Harvard, Vancouver, ISO, and other styles

12

Marrocco, Michele. "Classical approach to off‐resonant Raman coherence with chirped femtosecond laser pulses." Journal of Raman Spectroscopy 52, no. 9 (February 24, 2021): 1606–16. http://dx.doi.org/10.1002/jrs.6083.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Mahdian, Zeinab, Saeed Mirzanejhad, Taghi Mohsenpour, and Meisam Taghipour. "Polarization influence on the backward Raman amplification through chirped pump laser pulse." Optik 149 (November 2017): 372–77. http://dx.doi.org/10.1016/j.ijleo.2017.09.043.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Krylov, A. A., A. V. Gladyshev, A. K. Senatorov, A. N. Kolyadin, A. F. Kosolapov, M. M. Khudyakov, M. E. Likhachev, and I. A. Bufetov. "1.56-to-2.84 μm SRS conversion of chirped pulses of a high-power erbium fibre laser in a methane-filled hollow-core revolver fibre." Quantum Electronics 52, no. 3 (March 1, 2022): 274–77. http://dx.doi.org/10.1070/qel18003.

Full text

Abstract:

Abstract Single-cascade 1.56-to-2.84 μm SRS conversion is demonstrated in a hollow-core revolver fibre filled with methane at a pressure of 25 atm under pumping by positively chirped pulses of a high-power erbium-doped all-fibre laser. At a maximum pump pulse energy of 34 μJ (average power 3.74 W) and a pump pulse duration of about 260 ps, ultrashort pulses (USPs) with a duration of 110 ps and an energy of 1.33 μJ (average power 133 mW) are achieved at the centre wavelength of 2.84 μm. The gas fibre Raman lasers based on hollow-core fibres with pumping by high-power fibre sources are promising for producing all-fibre systems emitting USPs in the mid-IR range.

APA, Harvard, Vancouver, ISO, and other styles

15

Chelkowski, Szczepan, and George N. Gibson. "Adiabatic climbing of vibrational ladders using Raman transitions with a chirped pump laser." Physical Review A 52, no. 5 (November 1, 1995): R3417—R3420. http://dx.doi.org/10.1103/physreva.52.r3417.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Rocha-Mendoza, Israel, Wolfgang Langbein, Peter Watson, and Paola Borri. "Differential coherent anti-Stokes Raman scattering microscopy with linearly chirped femtosecond laser pulses." Optics Letters 34, no. 15 (July 17, 2009): 2258. http://dx.doi.org/10.1364/ol.34.002258.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Yan, Donglin, Ruoyu Liao, Chao Guo, Pengfei Zhao, Qiang Shu, Honghuan Lin, Jianjun Wang, and Rumao Tao. "A 3.7-kW Oscillating-Amplifying Integrated Fiber Laser Featuring a Compact Oval-Shaped Cylinder Package." Micromachines 14, no. 2 (January 20, 2023): 264. http://dx.doi.org/10.3390/mi14020264.

Full text

Abstract:

Combining the advantages of high efficiency, environmental robustness, and anti-reflection behavior, oscillating-amplifying integrated fiber lasers have become popular for use in high-power laser structures in industrial applications, wherein the size of the laser source matters. Here, an oscillating-amplifying integrated fiber laser in an oval-shaped cylinder package has been proposed and demonstrated, the footprint for which only occupies an area of 0.024 m2 apart from the pump diode, which is much smaller than in traditional planar fiber laser packages. Numerical simulations have been carried out, which have revealed that an oval-shaped cylinder package can effectively suppress the high-order mode in large mode area fiber setups and thereby benefit the integration of fusion points and the unpackaged elements at the same time. Over 3.7 kW of transverse mode instability (TMI)-free output power has been obtained, with a slope efficiency higher than 80%. With a custom-made chirped and tilted fiber Bragg grating (CTFBG), the Raman suppression ratio is improved to reach 38 dB at peak output power. The oval-shaped design has been verified to assist with the realization of TMI suppression and improve the integration of high-power fiber lasers. To the best of our knowledge, this fiber laser has among the smallest footprints of the various fiber sources at such high-power operating levels.

APA, Harvard, Vancouver, ISO, and other styles

18

Kinyaevskiy, I. O., A. V. Koribut, Ya V. Grudtsyn, L. V. Seleznev, V. I. Kovalev, D. V. Pushkarev, E. E. Dunaeva, and A. A. Ionin. "Frequency down-conversion of a chirped Ti:sapphire laser pulse with BaWO₄ Raman shifter and second-order nonlinear crystal." Laser Physics Letters 19, no. 9 (August 10, 2022): 095403. http://dx.doi.org/10.1088/1612-202x/ac7f36.

Full text

Abstract:

Abstract We experimentally carried out frequency conversion of a chirped and stretched up to 200 ps near-IR 90 fs Ti:Sapphire laser pulse into the mid-IR through difference frequency generation in either GaSe or LiGaS2 crystal. The crystal was pumped by laser radiation that passed through a BaWO4 crystal, where Stokes frequency-shifted radiation (signal wave) was generated through SRS. The generated ∼60 nJ mid-IR pulse had a central wavelength of 11.1 μm and FWHM spectral width of about 0.2 μm, which made it possible to achieve a pulse duration of ∼0.9 ps after its compression. The mid-IR pulse generation efficiency was ∼10−3% at SRS efficiency of 3%. To the best of our knowledge, this all solid-state scheme combining Raman shifting and second-order nonlinear crystals achieves the frequency down-conversion of femtosecond near-IR laser pulses to ∼11 μm radiation for the first time.

APA, Harvard, Vancouver, ISO, and other styles

19

Miriam Cheriyan, Renju, Nikhil Varghese, R. S. Sooraj, Kavya H. Rao, and N. Smijesh. "A Comprehensive Review on Amplification of Laser Pulses via Stimulated Raman Scattering and Stimulated Brillouin Scattering in Plasmas." Plasma 5, no. 4 (November 24, 2022): 499–539. http://dx.doi.org/10.3390/plasma5040037.

Full text

Abstract:

The demand for high-intensity lasers has grown ever since the invention of lasers in 1960, owing to their applications in the fields of inertial confinement fusion, plasma-based relativistic particle accelerators, complex X-ray and gamma-ray sources, and laboratory astrophysics. To create such high-intensity lasers, free-running lasers were either Q-switched or mode-locked to increase the peak power to the gigawatt range. Later, chirped pulse amplification was developed, allowing the generation of peak power up to 1012 W. However, the next generation of high-intensity lasers might not be able to be driven by the solid-state technology alone as they are already operating close to their damage thresholds. In this scenario, concepts of amplification based on plasmas has the potential to revolutionize the laser industry, as plasma is already a broken-down medium, and hence does not pose any problems related to the damage thresholds. On the other hand, there are many other aspects that need to be addressed before developing technologies based on plasma-based amplification, and they are being investigated via theoretical and numerical methods and supported by several experiments. In this report, we review the prospects of employing plasma as the medium of amplification by utilising stimulated scattering techniques, such as the stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) techniques, to modulate high-power laser pulses, which would possibly be the key to the next generation of high-power lasers. The 1980s saw the commencement of research in this field, and possibilities of obtaining high peak powers were verified theoretically with the help of numerical calculations and simulations. The extent of amplification by these stimulated scattering schemes are limited by a number of instabilities such as forward Raman scattering (FRS), filamentation, etc., and here, magnetised plasma played an important role in counteracting these parasitic effects. The current research combines all these factors to experimentally realise a large-scale plasma-based amplifier, which can impact the high-energy laser industry in the near future.

APA, Harvard, Vancouver, ISO, and other styles

20

Vallee, Ral, Erik Belanger, Bernard Dery, Martin Bernier, and Dominic Faucher. "Highly Efficient and High-Power Raman Fiber Laser Based on Broadband Chirped Fiber Bragg Gratings." Journal of Lightwave Technology 24, no. 12 (December 2006): 5039–43. http://dx.doi.org/10.1109/jlt.2006.884998.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Saadati-Niari, M., and N. Shirkhanghah. "Population transfer in a nonlinear three-level Λ-system by Stark - chirped rapid adiabatic passage." Canadian Journal of Physics 99, no. 9 (September 2021): 799–805. http://dx.doi.org/10.1139/cjp-2020-0563.

Full text

Abstract:

We propose the use of the Stark-chirped rapid adiabatic passage (SCRAP) method to induce a complete population transfer in a nonlinear three-level Λ-type system (nl-SCRAP). We also use the nl-SCRAP method for creating stable diatomic ground molecular Bose–Einstein condensates (BECs) from atomic BECs. In this three-laser technique the pump and Stokes pulses are slightly detuned from transition frequencies, and a third strong hyperbolic-tangent laser pulse induces dynamic Stark shifts of the relevant transitions and compensates for third-order nonlinearities. If the timing of the three pulses is appropriately chosen, the nonlinear quantum system is prepared to almost complete population inversion between the two lower states in the Λ-like scheme. The paper shows that the efficiency of the nl-SCRAP is higher than the nonlinear stimulated Raman adiabatic passage (nl-STIRAP) technique, and this method can be used in one-photon as well as multi-photon transitions. The transfer process is robust concerning fluctuations of experimental parameters, such as peak Rabi frequencies, the time delay between pulses, and static detunings.

APA, Harvard, Vancouver, ISO, and other styles

22

Richardson, D. R., R. P. Lucht, W. D. Kulatilaka, S. Roy, and J. R. Gord. "Theoretical modeling of single-laser-shot, chirped-probe-pulse femtosecond coherent anti-Stokes Raman scattering thermometry." Applied Physics B 104, no. 3 (April 9, 2011): 699–714. http://dx.doi.org/10.1007/s00340-011-4489-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

HU, XUE-JIN, WEI ZHANG, YIN HUANG, JUN-FENG YANG, and SHU-LIN CONG. "FORMATION OF ULTRACOLD CESIUM MOLECULES IN THE GROUND ELECTRONIC STATE." Journal of Theoretical and Computational Chemistry 11, no. 06 (December 2012): 1323–30. http://dx.doi.org/10.1142/s0219633612500897.

Full text

Abstract:

We investigate theoretically the preparation of ultracold photoassociated Cs 2 molecules in the lowest vibrational level of the ground electronic state via the stimulated Raman adiabatic passage (STIRAP) by solving the time-dependent Schrödinger equation using the mapped Fourier grid method. A negative chirped laser pulse is used to produce the unstable photoassociated molecules in the excited electronic state. A dump pulse is utilized to transfer a partial population of the unstable photoassociated molecules to the vibrational v″ = 18 level of the ground electronic state. This part of population is then transferred to the v″ = 0 level of the ground electronic state by the pump and Stokes laser pulses via an intermediate state which is taken to be the v′ = 7 level of the excited electronic state, forming the stable photoassociated molecules. The population transfer efficiency from v″ = 18 to v″ = 0 in the ground electronic state reaches 96.2% via the STIRAP.

APA, Harvard, Vancouver, ISO, and other styles

24

Funkner, Stefan, Katsuya Saito, Gudrun Niehues, Yoshiki Yazawa, Takashi Furuya, Kohji Yamamoto, and Masahiko Tani. "Utilization of chirped laser pulses to measure stimulated Raman scattering of organic liquids in the terahertz regime." Applied Physics Letters 105, no. 2 (July 14, 2014): 021103. http://dx.doi.org/10.1063/1.4890092.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Sarkar, Chitrakshya, Rangana Bhattacharya, S. S. Bhattacharyya, and Samir Saha. "Population transfer to excited vibrational levels of H2 molecule by stimulated hyper-Raman passage with chirped laser pulses." Journal of Chemical Physics 127, no. 10 (September 14, 2007): 104304. http://dx.doi.org/10.1063/1.2775448.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Wang, Zefeng, Meng Wang, and Qihao Hu. "Filtering of stimulated Raman scattering in a monolithic fiber laser oscillator using chirped and tilted fiber Bragg gratings." Laser Physics 29, no. 7 (May 10, 2019): 075101. http://dx.doi.org/10.1088/1555-6611/ab1537.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Zheltikov, A. M. "Limiting temporal and spectral resolution in spectroscopy and microscopy of coherent Raman scattering with chirped ultrashort laser pulses." Journal of Experimental and Theoretical Physics 100, no. 5 (May 2005): 833–43. http://dx.doi.org/10.1134/1.1947308.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Marrocco, M. "Simple model of coherent anti-Stokes Raman scattering signals generated by means of linearly chirped ultrashort Gaussian laser pulses." Journal of Raman Spectroscopy 49, no. 7 (March 24, 2018): 1109–15. http://dx.doi.org/10.1002/jrs.5373.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Pershin, Sergey M., Evgeny V. Shashkov, Nikolay S. Vorobiev, Sergey P. Nikitin, Mikhail Ya Grishin, and Anton S. Komel’Kov. "Asymmetric broadening and blue shift of the stimulated Raman scattering spectrum in water under chirped picosecond laser pulse train excitation." Laser Physics Letters 17, no. 11 (November 1, 2020): 115403. http://dx.doi.org/10.1088/1612-202x/abbf47.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Tian, Xin, Xiaofan Zhao, Meng Wang, and Zefeng Wang. "Effective suppression of stimulated Raman scattering in direct laser diode pumped 5 kilowatt fiber amplifier using chirped and tilted fiber bragg gratings." Laser Physics Letters 17, no. 8 (July 22, 2020): 085104. http://dx.doi.org/10.1088/1612-202x/aba051.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Tan, Fangzhou, Hongxing Shi, Ruoyu Sun, Peng Wang, and Pu Wang. "1 μJ, sub-300 fs pulse generation from a compact thulium-doped chirped pulse amplifier seeded by Raman shifted erbium-doped fiber laser." Optics Express 24, no. 20 (September 19, 2016): 22461. http://dx.doi.org/10.1364/oe.24.022461.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Luo, Mufei, Stefan Hüller, Min Chen, and Zhengming Sheng. "Frequency chirp effects on stimulated Raman scattering in inhomogeneous plasmas." Physics of Plasmas 29, no. 7 (July 2022): 072709. http://dx.doi.org/10.1063/5.0096771.

Full text

Abstract:

Previous studies have shown that the use of laser bandwidth may mitigate the growth of stimulated Raman scattering (SRS) in laser plasma interaction experiments, in particular, when the spectrum of the driving (or pump) laser is composed of uniformly distributed frequency components with a well-chosen bandwidth [for example, Luo et al., Phys. Plasmas 29, 032102 (2022); Wen et al., ibid. 28, 042109 (2021); and Follett et al., ibid. 26, 062111 (2019)]. Here, we investigate the effects of frequency chirp in the pump laser on backward SRS in inhomogeneous plasmas, taking into account kinetic effects associated with the nonlinear detuning of the parametric resonance due to high-amplitude electron plasma waves (EPW). Through theoretical considerations and numerical simulations, using a multi-dimensional particle-in-cell (PIC) code, it is shown that positive frequency chirp rates lead to a displacement of the resonance in the plasma profile. For a sufficiently strong positive chirp rate, such that the resonance displacement is faster than the EPW group velocity, the EPWs prove to remain limited in amplitude such that SRS is suppressed. The required frequency chirp rate corresponds to a laser bandwidth of about 1%–2%.

APA, Harvard, Vancouver, ISO, and other styles

33

Fu, Dan, Gary Holtom, Christian Freudiger, Xu Zhang, and Xiaoliang Sunney Xie. "Hyperspectral Imaging with Stimulated Raman Scattering by Chirped Femtosecond Lasers." Journal of Physical Chemistry B 117, no. 16 (January 18, 2013): 4634–40. http://dx.doi.org/10.1021/jp308938t.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Ning, G., P. Shum, S. Aditya, D. Liu, Y. Gong, N. Q. Ngo, and M. Tang. "Multiwavelength Raman fiber lasers with equalized peak power using a sampled chirped fiber Bragg grating." Applied Physics B 83, no. 2 (March 21, 2006): 249–53. http://dx.doi.org/10.1007/s00340-006-2166-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Yang, Zihui, Fanpeng Dong, Hongguang Liu, Xiaoxia Yang, Zhiwei Li, and Bin Xue. "Direct Underwater Sound Velocity Measurement Based on the Acousto-Optic Self-Interference Effect between the Chirp Signal and the Optical Frequency Comb." Journal of Marine Science and Engineering 11, no. 1 (December 23, 2022): 18. http://dx.doi.org/10.3390/jmse11010018.

Full text

Abstract:

Underwater sound speed plays a vital role in maritime safety. Based on the acousto-optic self-interference effect, we proposed a new method to measure underwater sound speed utilizing Raman–Nath diffraction, generated by the acousto-optic effect between an optical frequency comb and pulsed chirp signal. When the pulsed chirp travels between the measurement and reference arm in the experimental setup that we constructed, the same signal resulting from acousto-optic self-interference is produced. The time gap between the two identical signals represents the time interval. Thus, we can determine the time-of-flight using cross-correlation. The optical path difference between the two arms is double the flight distance of ultrasonic waves and can easily be obtained using femtosecond laser interferometry. The time gap and the distance can be used to measure sound speed. The experimental results show that the chirp signal improves the signal-to-noise ratio and expands the applicable time-of-flight algorithm. The waveform pulse width after cross-correlation is 1.5 μs, compared with 40 μs before. The time-of-flight uncertainty can achieve 1.03 ns compared to 8.6 ns before. Uncertainty of sound velocity can achieve 0.026 m/s.

APA, Harvard, Vancouver, ISO, and other styles

36

Lanin, A. A., E. A. Stepanov, R. A. Tikhonov, D. A. Sidorov-Biryukov, A. B. Fedotov, and A. M. Zheltikov. "A compact laser platform for nonlinear Raman microspectroscopy: multimodality through broad chirp tunability." Journal of Raman Spectroscopy 47, no. 9 (January 28, 2016): 1042–48. http://dx.doi.org/10.1002/jrs.4860.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Wang, Meng, Zefeng Wang, Le Liu, Qihao Hu, Hu Xiao, and Xiaojun Xu. "Effective suppression of stimulated Raman scattering in half 10 kW tandem pumping fiber lasers using chirped and tilted fiber Bragg gratings." Photonics Research 7, no. 2 (January 23, 2019): 167. http://dx.doi.org/10.1364/prj.7.000167.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Che, Hao, An Li, Jie Fang, Xi Chen, and Fang-Jun Qin. "Interference fringe fitting of atom gravimeter based on fitness particle swarm optimization." AIP Advances 12, no. 7 (July 1, 2022): 075211. http://dx.doi.org/10.1063/5.0096967.

Full text

Abstract:

In the atom gravimeter, three Raman pulses are utilized to realize the interference of atom matter waves, and atom interference fringes are obtained by scanning the chirp rate of the Raman laser during the interference time. Previously, fringe data analysis methods used LS (Least Squares) to fit the cosine function of each interference fringe data to minimize the standard deviation between the estimated value and the observed value of each group of fringe data or the EKF (Extended Kalman Filter) method to obtain the estimation of the gravity value. In this paper, we propose a new method applied to the interference fringe fitting of the atom gravimeter, namely, through the FPSO (Fitness Particle Swarm Optimization) method to estimate the parameters of the interference fringe atom and then estimate the gravity value. First, the theoretical analysis and proof are carried out by using simulation data. On this basis, we carried out a gravity measurement experiment in the ship-mounted mooring state, which further verified the feasibility and effectiveness of the algorithm. The simulation and experimental results show that, compared with LS and EKF methods, the FPSO method can search the relatively optimal fitting parameters of atom interference fringes quickly and accurately and improve the accuracy and stability of the atom gravimeter measurement. It is feasible and effective to apply the FPSO method to fitting atom interference fringes. The FPSO method proposed in this paper can be used as a new method for fitting atom interference fringes, which provides a new idea and choice for accurate gravity measurement in a dynamic environment.

APA, Harvard, Vancouver, ISO, and other styles

39

Tchitchekova, Deyana S., Szczepan Chelkowski, and André D. Bandrauk. "Adiabatic climbing of vibrational ladders using Raman transitions with chirped pump lasers: effect of higher electronic surfaces and control of the shapes of vibrational wave packets." Journal of Raman Spectroscopy 38, no. 7 (2007): 927–35. http://dx.doi.org/10.1002/jrs.1738.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Yau, T. W., C. J. Hsu, H. H. Chu, Y. H. Chen, C. H. Lee, J. Wang, and S. Y. Chen. "Dependence of relativistic self-guiding and Raman forward scattering on duration and chirp of an intense laser pulse propagating in a plasma." Physics of Plasmas 9, no. 2 (February 2002): 391–94. http://dx.doi.org/10.1063/1.1430251.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Faure, J., J. R. Marquès, V. Malka, F. Amiranoff, Z. Najmudin, B. Walton, J. P. Rousseau, S. Ranc, A. Solodov, and P. Mora. "Dynamics of Raman instabilities using chirped laser pulses." Physical Review E 63, no. 6 (May 24, 2001). http://dx.doi.org/10.1103/physreve.63.065401.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Turčičová, Hana, and Jaroslav Huynh. "Stimulated Raman Backscattering in Plasma — a Promising Tool for the Generation of Ultra-High Power Laser Beams." Acta Polytechnica 53, no. 2 (January 2, 2013). http://dx.doi.org/10.14311/1777.

Full text

Abstract:

In the last fifteen years stimulated Raman backscattering (SRBS) in plasma has been intensively elaborated as a promising tool on the way towards high intense lasers. There are several advantages of this technique in comparison to the world-wide used the CPA-Chirped Pulse Amplification technique for a laser amplification. We present the principle of the SRBS technique, the best results so far obtained in theory and experiment, and a possible SRBS project at the PALS Research Centre in Prague.

APA, Harvard, Vancouver, ISO, and other styles

43

Wang, Meng, Le Liu, Zefeng Wang, Xiaoming Xi, and Xiaojun Xu. "Mitigation of stimulated Raman scattering in kilowatt-level diode-pumped fiber amplifiers with chirped and tilted fiber Bragg gratings." High Power Laser Science and Engineering 7 (2019). http://dx.doi.org/10.1017/hpl.2019.1.

Full text

Abstract:

The average power of diode-pumped fiber lasers has been developed deeply into the kW regime in the past years. However, stimulated Raman scattering (SRS) is still a major factor limiting the further power scaling. Here, we have demonstrated the mitigation of SRS in kilowatt-level diode-pumped fiber amplifiers using a chirped and tilted fiber Bragg grating (CTFBG) for the first time. The CTFBG is designed and inscribed in large-mode-area (LMA) fibers, matching with the operating wavelength of the fiber amplifier. With the CTFBG inserted between the seed laser and the amplifier stage, an SRS suppression ratio of ${\sim}10~\text{dB}$ is achieved in spectrum at the maximum output laser power of 2.35 kW, and there is no reduction in laser slope efficiency and degradation in beam quality. This work proves the feasibility and practicability of CTFBGs for SRS suppression in high-power fiber lasers, which is very useful for the further power scaling.

APA, Harvard, Vancouver, ISO, and other styles

44

Perez-Herrera, R. A., P. Roldan-Varona, M. Galarza, S. Sañudo-Lasagabaster, L. Rodriguez-Cobo, J. M. Lopez-Higuera, and M. Lopez-Amo. "Hybrid Raman-erbium random fiber laser with a half open cavity assisted by artificially controlled backscattering fiber reflectors." Scientific Reports 11, no. 1 (April 28, 2021). http://dx.doi.org/10.1038/s41598-021-88748-w.

Full text

Abstract:

AbstractA hybrid Raman-erbium random fiber laser with a half-open cavity assisted by chirped artificially controlled backscattering fiber reflectors is presented. A combination of a 2.4 km-long dispersion compensating fiber with two highly erbium-doped fiber pieces of 5 m length were used as gain media. A single random laser emission line centered at 1553.8 nm with an optical signal to noise ratio of 47 dB were obtained when pumped at 37.5 dBm. A full width at half maximum of 1 nm and a 100% confidence level output power instability as low as 0.08 dB were measured. The utilization of the new laser cavity as a temperature and strain sensor is also experimentally studied.

APA, Harvard, Vancouver, ISO, and other styles

45

Redeckas, Kipras, Vladislava Voiciuk, and Mikas Vengris. "A tunable femtosecond stimulated Raman scattering system based on spectrally narrowed second harmonic generation." Lithuanian Journal of Physics 56, no. 1 (April 26, 2016). http://dx.doi.org/10.3952/physics.v56i1.3273.

Full text

Abstract:

In this work we present a femtosecond stimulated Raman scattering system. The setup is based on a commercial femtosecond laser system supplemented by a pair of travelling-wave optical parametric amplifiers. One of the parametric amplifiers is used to generate the femtosecond actinic pump pulses, whereas the output of the other (high-power) parametric amplifier undergoes a combination of spectrally narrowed second harmonic generation in a long non-linear crystal and subsequent spectral filtering for the generation of narrowband Raman pump pulses. Chirped white light supercontinuum is used as the Raman probe. The setup offers tunability of the Raman pump pulses in the 400–800 nm range, and spectral and temporal resolutions of ca. 6 cm–1 and ca. 70 fs, respectively. We present the basic technical and optical aspects of the system along with data acquisition and signal retrieval techniques. We characterize the system by exploring the time-resolved vibrational dynamics of the S2(11Bu+) and S1(21Ag–) excited states of β-carotene.

APA, Harvard, Vancouver, ISO, and other styles

46

Nuter, R., and V. Tikhonchuk. "Prepulse suppression and optimization of backward Raman amplification with a chirped pump laser beam." Physical Review E 87, no. 4 (April 22, 2013). http://dx.doi.org/10.1103/physreve.87.043109.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

万婷, 程栋, 张翰达, and 陈长水. "The wavelength conversion with KTP crystal based on stark-chirped rapid adiabatic passage." Acta Physica Sinica, 2022, 0. http://dx.doi.org/10.7498/aps.71.20210887.

Full text

Abstract:

The nonlinear wavelength conversion can generate the laser wavelengths which are not directly available, thereby broadening the laser spectrum range. However, the existence of phase mismatch greatly limits the development and application of nonlinear optical technology. The wavelength conversion schemes in a manner analogous to population transfer in atomic rapid adiabatic passage, stimulated Raman adiabatic passage(STIRAP), and Stark chirped rapid adiabatic passage(SCRAP) provide feasible solutions for efficient and broadband wavelength conversion. SCRAP use the Stark shift caused by the Stark field to generate energy level crossings, thereby, the population in initial state can be efficiently converted to the target state. It does not require the two-photon resonance, can be applied to multi-photon transition. In this paper, by approximate analogy to the adiabatic population theory, a wavelength conversion model with the KTP crystals based on SCRAP is established, the influence of the coupling delay parameters, width parameters, pump intensity, temperature, and incident wavelength on the conversion process are systematically studied. The results show that signal laser energy can almost convert into output laser energy, while the intermediate laser energy is kept extremely low during the conversion process. The conversion process is sensitive to changes in coupling delay parameters, width parameters, and pump intensity. The farther away from the optimal coupling delay parameter, the lower the conversion efficiency. When the width parameter is fixed, as the width parameter increases, the conversion efficiency will first increase to the maximum, and then slowly decrease. At the same time, the greater the value of the width parameter , the greater the maximum conversion efficiency that can be achieved, and the greater the bandwidth that can achieve high-efficiency wavelength conversion. The conversion efficiency increases as the pump intensity increases. However, changes in temperature and incident wavelength have little effect on the conversion efficiency. The above research can provide a theoretical basis for the acquisition of ultraviolet to mid-infrared.

APA, Harvard, Vancouver, ISO, and other styles

48

Sun, Zhi-Xin, Bing-Kuan Lyu, Gaoren Wang, and Shu-Lin Cong. "Full optical preparation of absolute ground-state ultracold CsYb molecule via laser-assisted self-induced Feshbach resonance." Journal of Physics B: Atomic, Molecular and Optical Physics, August 18, 2022. http://dx.doi.org/10.1088/1361-6455/ac8adc.

Full text

Abstract:

Abstract We investigate theoretically the formation of ultracold CsYb molecule in the absolute ground state by full optical control. The laser-assisted self-induced Feshbach resonance takes place when the trap state in the optical lattice is coupled with a rovibrational state of the ground electronic state. The Feshbach molecule is formed in the resonant rovibrational state via an adiabatic population transfer by ramping the frequency of a chirped pulse. Two schemes are designed to prepare the absolute ground-state molecule starting from the Feshbach molecule: a pump-dump scheme controlled by short pulses and a stimulated-Raman-adiabatic-passage (STIRAP) scheme steered by long pulses. The probabilities of converting the Feshbach molecule to the absolute ground state molecule by using the pump-dump and the STIRAP schemes are 16% and 99%, respectively.

APA, Harvard, Vancouver, ISO, and other styles

49

Sarkar, Chitrakshya, Rangana Bhattacharya, S. S. Bhattacharyya, and Samir Saha. "Control of population transfer in a multilevelLi2molecule by stimulated hyper-Raman nonadiabatic passage with chirped laser pulses." Physical Review A 78, no. 2 (August 14, 2008). http://dx.doi.org/10.1103/physreva.78.023406.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Jiao, Kerong, Jian Shu, Hua Shen, Zhiwen Guan, Feiyan Yang, and Rihong Zhu. "Fabrication of kW-level chirped and tilted fiber Bragg gratings and filtering of stimulated Raman scattering in high-power CW oscillators." High Power Laser Science and Engineering 7 (2019). http://dx.doi.org/10.1017/hpl.2019.18.

Full text

Abstract:

Suppression of stimulated Raman scattering (SRS) by means of chirped and tilted fiber Bragg gratings (CTFBGs) has become a key topic. However, research on high-power systems is still lacking due to two problems. Firstly, after the inscription, there are a large number of hydroxyl compounds and hydrogen molecules in CTFBGs that cause significant heating due to their strong infrared absorption. Secondly, CTFBGs can couple Stokes light from the core to the cladding and the coating, which causes serious heating in the coating of the CTFBG. Aimed at overcoming these bottlenecks, a process that combines constant-low-temperature and variable-high-temperature annealing is used to reduce the thermal slope of the CTFBG. Also, a segmented-corrosion cladding power stripping technology is used on the CTFBG to remove the Stokes light which is coupled to the cladding, which solves the problem of overheating in the coating of the CTFBG. Thereby, a CTFBG with both a kilowatt-level power-carrying load and the ability to suppress SRS in a fiber laser has been developed. Further, we establish a kW-level CW oscillator to test the CTFBG. Experimental results demonstrate that the power-carrying load of the CTFBG is close to 1 kW, the thermal slope is lower than $0.015\,^{\circ }\text{C}/\text{W}$, and the SRS suppression ratio is nearly 23 dB.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!