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1

Chao Shen, Chao Shen, Yujun Zhang Yujun Zhang, and Jiazheng Ni Jiazheng Ni. "Real-time adaptive noise cancelling for signal-to-noise enhancement in direct absorption spectroscopy." Chinese Optics Letters 11, no. 7 (2013): 073001–73004. http://dx.doi.org/10.3788/col201311.073001.

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Lun, Zhichen, Xiaohong Wu, Jiajun Dong, and Bin Wu. "Deep Learning-Enhanced Spectroscopic Technologies for Food Quality Assessment: Convergence and Emerging Frontiers." Foods 14, no. 13 (2025): 2350. https://doi.org/10.3390/foods14132350.

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Nowadays, the development of the food industry and economic recovery have driven escalating consumer demands for high-quality, nutritious, and safe food products, and spectroscopic technologies are increasingly prominent as essential tools for food quality inspection. Concurrently, the rapid rise of artificial intelligence (AI) has created new opportunities for food quality detection. As a critical branch of AI, deep learning synergizes with spectroscopic technologies to enhance spectral data processing accuracy, enable real-time decision making, and address challenges from complex matrices an
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Velichko, E. N., O. I. Kotov, E. K. Nepomnyashchaya, A. N. Petrov, and A. V. Sokolov. "On Basic Requirements to Main Elements of Laser Correlation Spectrometer." Journal of the Russian Universities. Radioelectronics 23, no. 1 (2020): 83–95. http://dx.doi.org/10.32603/1993-8985-2020-23-1-83-95.

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Introduction. Laser correlation spectroscopy is a promising method that allows one to analyze sizes of nanoparticles and to evaluate their shape and dynamics of aggregation in liquids. A limited usage of laser correlation spectroscopy is currently caused by insufficient accuracy of existing instruments and data processing algorithms. The paper described the development of laser correlation spectroscopic hardware complex designed for nanoparticles size determination in liquids. The basic requirements for the elements of the device and the approaches used to calculate the signal-to-noise ratio w
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Hu, Mengyuan, Andrea Ventura, Juliano Grigoleto Hayashi, Francesco Poletti, and Wei Ren. "Mid-Infrared Frequency Modulation Spectroscopy of NO Detection in a Hollow-Core Antiresonant Fiber." Photonics 9, no. 12 (2022): 935. http://dx.doi.org/10.3390/photonics9120935.

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Mid-infrared frequency modulation spectroscopy (FMS) in a tellurite hollow-core antiresonant fiber (HC-ARF) is investigated for gas detection. The spectroscopic system is demonstrated for nitric oxide (NO) detection by exploiting its strong absorption line at 1900.08 cm−1 with a quantum cascade laser (QCL). By modulating the injection current of the QCL at 250 MHz and measuring NO in a 35 cm long HC-ARF, we achieve a noise equivalent concentration of 67 ppb at an averaging time of 0.1 s. Compared to direct absorption spectroscopy with a low-pass filter for etalon noise reduction, the FMS techn
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Tang, Ting, Qing Luo, Liu Yang, Changlun Gao, Caijin Ling, and Weibin Wu. "Research Review on Quality Detection of Fresh Tea Leaves Based on Spectral Technology." Foods 13, no. 1 (2023): 25. http://dx.doi.org/10.3390/foods13010025.

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As the raw material for tea making, the quality of tea leaves directly affects the quality of finished tea. The quality of fresh tea leaves is mainly assessed by manual judgment or physical and chemical testing of the content of internal components. Physical and chemical methods are more mature, and the test results are more accurate and objective, but traditional chemical methods for measuring the biochemical indexes of tea leaves are time-consuming, labor-costly, complicated, and destructive. With the rapid development of imaging and spectroscopic technology, spectroscopic technology as an e
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6

Aleksandrov, E. B., and V. S. Zapasskii. "Spin Noise Spectroscopy." Journal of Physics: Conference Series 324 (October 21, 2011): 012002. http://dx.doi.org/10.1088/1742-6596/324/1/012002.

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7

Weng, Kanxing, Bin Wu, Feichen Wang, et al. "The Influence of Temperature on Frequency Modulation Spectroscopy in Atom Gravimeter." Sensors 22, no. 24 (2022): 9935. http://dx.doi.org/10.3390/s22249935.

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Atom gravimeters use locked lasers to manipulate atoms to achieve high-precision gravity measurements. Frequency modulation spectroscopy (FMS) is an accurate method of optical heterodyne spectroscopy, capable of the sensitive and rapid frequency locking of the laser. Because of the effective absorption coefficient, Doppler broadening and susceptibility depend on temperature, and the signal-to-noise ratio (SNR) of the spectroscopy could be affected by temperature. We present a detailed study of the influence of the temperature on FMS in atom gravimeters, and the experimental results show that t
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8

Paldus, Barbara A., and Alexander A. Kachanov. "An historical overview of cavity-enhanced methods." Canadian Journal of Physics 83, no. 10 (2005): 975–99. http://dx.doi.org/10.1139/p05-054.

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An historical overview of laser-based, spectroscopic methods that employ high-finesse optical resonators is presented. The overview begins with the early work in atomic absorption (1962) and optical cavities (1974) that led to the first mirror reflectivity measurements in 1980. This paper concludes with very recent extensions of cavity-enhanced methods for the study of condensed-phase media and biological systems. Methods described here include cavity ring-down spectroscopy, integrated cavity output spectroscopy, and noise-immune cavity-enhanced optical heterodyne molecular spectroscopy. Given
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9

Ishibe, Kiyoshiro, Satoru Nakada, Yutaka Mera, and Koji Maeda. "Nanoprobe Fourier-Transform Photoabsorption Spectroscopy Using a Supercontinuum Light Source." Microscopy and Microanalysis 18, no. 3 (2012): 591–95. http://dx.doi.org/10.1017/s1431927612000219.

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AbstractA scheme of photoabsorption spectroscopy based on scanning tunneling microscopy (STM) has been developed by using a supercontinuum light as the wideband light source of a Fourier transform interferometer for spectroscopic measurements. The performance was demonstrated for a sample of GaAs. The proof-of-concept test showed that the use of the supercontinuum light instead of halogen lamps greatly enhances the signal-to-noise ratio due to the high brilliance of the supercontinuum light emitted from a small core of the photonic crystal fiber that enables tight focusing of the spectroscopy
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10

Peng, Zhimin, Yanjun Du, and Yanjun Ding. "Highly Sensitive, Calibration-Free WM-DAS Method for Recovering Absorbance—Part I: Theoretical Analysis." Sensors 20, no. 3 (2020): 681. http://dx.doi.org/10.3390/s20030681.

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The absorbance is of great importance in the tunable diode laser absorption spectroscopy (TDLAS) as it contains information of both gas properties and spectroscopic parameters. A novel, calibration-free wavelength modulation-direct absorption spectroscopy (WM-DAS) is proposed and experimentally verified in this two-part paper. This method combines the capability of absorbance measurement from DAS and the advantages of enhanced noise rejection and high sensitivity from WMS. In this Part I, we focus on the full theoretical basis and procedures of this method from the following three aspects: the
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11

Starosielec, Sebastian, and Daniel Hägele. "Ultrafast spin noise spectroscopy." Applied Physics Letters 93, no. 5 (2008): 051116. http://dx.doi.org/10.1063/1.2969041.

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12

Ferrie, Chris, Chris Granade, Gerardo Paz-Silva, and Howard M. Wiseman. "Bayesian quantum noise spectroscopy." New Journal of Physics 20, no. 12 (2018): 123005. http://dx.doi.org/10.1088/1367-2630/aaf207.

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13

Jones, B. K. "Low-frequency noise spectroscopy." IEEE Transactions on Electron Devices 41, no. 11 (1994): 2188–97. http://dx.doi.org/10.1109/16.333840.

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14

Ritu, Goswami, Sudha Vengurlekar Dr., and Sachin Kumar Jain Dr. "Comparative Evaluation of Conventional Backscattered Raman Spectroscopy and Transmission Raman Spectroscopy (TRS) for Monitoring Authenticity of APIs in Fixed Dose Combination Drug of Ibuprofen and Paracetamol." Pharmaceutical and Chemical Journal 10, no. 4 (2023): 30–38. https://doi.org/10.5281/zenodo.13995725.

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Raman spectroscopy, one of the most widely used optical spectroscopic technique can provide molecular information about pharmaceutical drugs. This particular spectroscopic technique has proven its potential over the others by overcoming the barriers faced in traditional approaches and by providing unique benefit of molecular characterization in near real time. In this spectroscopy method, incident light interacts with the molecule inelastically and the scattered light has specific vibration modes of molecules in form of sharper Raman peaks. The technique thus can identify the molecular structu
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15

Bojęś, Piotr, Piotr Pokryszka, Piotr Jaworski, Fei Yu, Dakun Wu, and Karol Krzempek. "Quartz-Enhanced Photothermal Spectroscopy-Based Methane Detection in an Anti-Resonant Hollow-Core Fiber." Sensors 22, no. 15 (2022): 5504. http://dx.doi.org/10.3390/s22155504.

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In this paper, the combination of using an anti-resonant hollow-core fiber (ARHCF), working as a gas absorption cell, and an inexpensive, commercially available watch quartz tuning fork (QTF), acting as a detector in the quartz-enhanced photothermal spectroscopy (QEPTS) sensor configuration is demonstrated. The proof-of-concept experiment involved the detection of methane (CH4) at 1651 nm (6057 cm−1). The advantage of the high QTF Q-factor combined with a specially designed low-noise amplifier and additional wavelength modulation spectroscopy with the second harmonic (2f-WMS) method of signal
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16

Zapasskii V. S., Kozlov G. G., and Ryzhov I. I. "Spin Noise Spectroscopy: Three Plots." Optics and Spectroscopy 130, no. 11 (2022): 1404. http://dx.doi.org/10.21883/eos.2022.11.55098.4095-22.

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The effect of magnetic resonance in the Faraday-rotation noise, demonstrated for the first time on an atom system more than 40 years ago, laid the foundations of a new research direction, the spin noise spectroscopy, that has been developing extensively in the last 20 years. Currently, the most popular research objects are atom and semiconductor paramagnetic materials, while research subjects are the magnetic resonance spectroscopy, the spin dynamics, the optical spectroscopy, the spectroscopy of light polarization noises. The rapid development of this new research direction laying at the inte
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17

Sato, Hidetoshi, Satoshi Wada, and Hideo Tashiro. "Fluorescence Backgroundless Ti: Sapphire Laser Using Acousto-Optical Tunable Filter for Raman Spectroscopic Measurements." Applied Spectroscopy 56, no. 10 (2002): 1303–7. http://dx.doi.org/10.1366/000370202760355019.

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The background noise inherent to tunable lasers, which emit broad band spontaneous fluorescence from the laser-active medium, is detrimental for sensitive Raman measurement. Using the diffraction effect in an acousto-optic device, we have developed a fluorescence backgroundless Ti: sapphire laser suited for near-infrared Raman spectroscopy. A Raman excitation profile consisting of series of Raman spectra of deoxygenated hemoglobin aqueous solutions was measured by changing excitation wavelengths, revealing the high potential of this laser as a spectroscopic light source.
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18

Yano, Kaori, and Toshiaki Hattori. "Improving a Terahertz Time-Domain Spectroscopy Apparatus Using Neodymium Magnets." International Letters of Chemistry, Physics and Astronomy 62 (November 2015): 10–14. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.62.10.

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The signal-to-noise ratio obtained from terahertz time-domain spectroscopy is significantly affected by the low available power of terahertz waves. We constructed a terahertz-wave source with emission power enhanced by a magnetic field. The emitter is composed of an InAs wafer and two neodymium magnets. The emitter was irradiated by femtosecond laser pulses. The data quality of terahertz spectroscopic measurements was evaluated, and reduction of error in the data obtained due to the terahertz power enhancement was observed.
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19

Yano, Kaori, and Toshiaki Hattori. "Improving a Terahertz Time-Domain Spectroscopy Apparatus Using Neodymium Magnets." International Letters of Chemistry, Physics and Astronomy 62 (November 27, 2015): 10–14. http://dx.doi.org/10.56431/p-cw453x.

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The signal-to-noise ratio obtained from terahertz time-domain spectroscopy is significantly affected by the low available power of terahertz waves. We constructed a terahertz-wave source with emission power enhanced by a magnetic field. The emitter is composed of an InAs wafer and two neodymium magnets. The emitter was irradiated by femtosecond laser pulses. The data quality of terahertz spectroscopic measurements was evaluated, and reduction of error in the data obtained due to the terahertz power enhancement was observed.
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20

Mark, Howard L., and Peter R. Griffiths. "Analysis of Noise in Fourier Transform Infrared Spectra." Applied Spectroscopy 56, no. 5 (2002): 633–39. http://dx.doi.org/10.1366/0003702021955196.

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The currently accepted theory of spectroscopic noise causes most spectroscopists to accept the statement that when the limiting noise source is constant detector noise (e.g., as in mid- and near-IR spectroscopy) the noise of a transmittance spectrum is also constant, and independent of the sample transmittance. A careful examination of the effect of noise on spectra, however, reveals that most of the previous derivations have neglected the effect of noise in the reference reading on the noise content of the spectra. The consequences range from the fact that even with constant detector noise, t
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21

Drexler, Petr, Pavel Fiala, Radim Kadlec, and Radek Kubasek. "The Instruments for Noise Spectroscopy." PIERS Online 6, no. 7 (2010): 609–12. http://dx.doi.org/10.2529/piers091218085414.

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22

Harsh, Rishav, and K. S. Narayan. "Noise spectroscopy of polymer transistors." Journal of Applied Physics 118, no. 20 (2015): 205502. http://dx.doi.org/10.1063/1.4936197.

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23

Römer, M., J. Hübner, and M. Oestreich. "Spin noise spectroscopy in semiconductors." Review of Scientific Instruments 78, no. 10 (2007): 103903. http://dx.doi.org/10.1063/1.2794059.

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24

Rosenbluh, M., A. Rosenhouse-Dantsker, A. D. Wilson-Gordon, M. D. Levenson, and R. Walser. "Spectroscopy with diode-laser noise." Optics Communications 146, no. 1-6 (1998): 158–62. http://dx.doi.org/10.1016/s0030-4018(97)00485-9.

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Aroutiounian, Vladimir M., Zara H. Mkhitaryan, Arkady A. Shatveryan, et al. "Noise Spectroscopy of Gas Sensors." IEEE Sensors Journal 8, no. 6 (2008): 786–90. http://dx.doi.org/10.1109/jsen.2008.923184.

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Pershin, Yuriy V., Valeriy A. Slipko, Dibyendu Roy, and Nikolai A. Sinitsyn. "Two-beam spin noise spectroscopy." Applied Physics Letters 102, no. 20 (2013): 202405. http://dx.doi.org/10.1063/1.4807011.

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Starchev, Konstantin, Jaro Ricka, and Jacques Buffle. "Noise on Fluorescence Correlation Spectroscopy." Journal of Colloid and Interface Science 233, no. 1 (2001): 50–55. http://dx.doi.org/10.1006/jcis.2000.7229.

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28

Yang, D. K., and D. B. Zax. "Bandwidth Extension in Noise Spectroscopy." Journal of Magnetic Resonance 135, no. 1 (1998): 267–70. http://dx.doi.org/10.1006/jmre.1998.1577.

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Yuzawa, Tetsuro, Chihiro Kato, Michael W. George, and Hiro-O. Hamaguchi. "Nanosecond Time-Resolved Infrared Spectroscopy with a Dispersive Scanning Spectrometer." Applied Spectroscopy 48, no. 6 (1994): 684–90. http://dx.doi.org/10.1366/000370294774368947.

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A nanosecond time-resolved infrared spectroscopic system based on a dispersive scanning spectrometer has been constructed. This is an advanced version of a similar system reported in a previous paper; the time resolution has been improved from 1 μs to 50 ns and the sensitivity from 10−4 in intensity changes to 10−6. These have been achieved by the use of a high-temperature ceramic infrared light source, a photovoltaic MCT detector, and a low-noise, wide-band preamplifier developed specifically for the present purpose. Time-resolved infrared spectra of a few samples of photochemical and photobi
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Shih, Wei-Chuan. "Constrained regularization for noninvasive glucose sensing using Raman spectroscopy." Journal of Innovative Optical Health Sciences 08, no. 04 (2015): 1550022. http://dx.doi.org/10.1142/s1793545815500224.

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Multivariate calibration is an important tool for spectroscopic measurement of analyte concentrations. We present a detailed study of a hybrid multivariate calibration technique, constrained regularization (CR), and demonstrate its utility in noninvasive glucose sensing using Raman spectroscopy. Similar to partial least squares (PLS) and principal component regression (PCR), CR builds an implicit model and requires knowledge only of the concentrations of the analyte of interest. Calibration is treated as an inverse problem in which an optimal balance between model complexity and noise rejectio
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Glazebrook, Karl, Themiya Nanayakkara, Danilo Marchesini, Glenn Kacprzak, and Colin Jacobs. "Revelation of Massive Quiescent Galaxies at z>3 from Deep JWST Spectroscopy." Proceedings of the International Astronomical Union 18, S377 (2022): 3–8. http://dx.doi.org/10.1017/s1743921323001552.

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AbstractWe present the first results from JWST/NIRSPEC spectroscopy of massive quiescent galaxy candidates at 3<z<4 to complete the spectroscopic survey of Schreiber et al. 2018. In the first six objects targeted (all of which were too faint to secure spectroscopic identifications from the ground) they all are confirmed as yet more massive quiescent galaxies at 3<z<4. The JWST spectra are high signal-to-noise and unambiguous. Most of them have ages of a few hundred Myr from stellar population fits to the spectra and about 1/3 show sign of AGN emission lines. One extraordinary objec
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32

Johnsen, Peter C., Sinéad A. Ryan, Christian Gentry, Anya Grafov, Henry Kapteyn, and Margaret Murnane. "A beamline for ultrafast extreme ultraviolet magneto-optical spectroscopy in reflection near the shot noise limit." Review of Scientific Instruments 94, no. 3 (2023): 033001. http://dx.doi.org/10.1063/5.0127119.

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High harmonic generation (HHG) makes it possible to measure spin and charge dynamics in materials on femtosecond to attosecond timescales. However, the extreme nonlinear nature of the high harmonic process means that intensity fluctuations can limit measurement sensitivity. Here we present a noise-canceled, tabletop high harmonic beamline for time-resolved reflection mode spectroscopy of magnetic materials. We use a reference spectrometer to independently normalize the intensity fluctuations of each harmonic order and eliminate long term drift, allowing us to make spectroscopic measurements ne
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33

Janot-Pacheco, Eduardo, and Nelson Vani Leister. "Seismology of southern Be stars." Symposium - International Astronomical Union 162 (1994): 104–5. http://dx.doi.org/10.1017/s0074180900214630.

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We have started in 1990 a search for moving bumps in the HeI λ 667.8 nm of mainly southern, bright Be stars. The objects of our sample have been selected on the basis of photometric variability (Cuypers et al., 1989). High resolution (R≥ 30,000), high signal-to-noise ratio (S/R≥ 300) spectroscopic observations have been performed at the brazilian Laboratório Nacional de Astrofísica with a CCD camera attached to the coudé spectrograph of the 1.60 m telescope (e.g. Table I). Several hundred spectra have been taken during the last three years. Photometric observations simultaneous with spectrosco
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Stadler, Adam, and Andrzej Dziedzic. "Virtual instruments in low-frequency noise spectroscopy experiments." Facta universitatis - series: Electronics and Energetics 28, no. 1 (2015): 17–28. http://dx.doi.org/10.2298/fuee1501017s.

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Low-frequency noise spectroscopy (LFNS) is an experimental technique to study noise spectra, typically below 10 kHz, as a function of temperature. Results of LFNS may be presented as the ?so-called? noise maps, giving a detailed insight into fluctuating phenomena in electronic devices and materials. The authors show the usefulness of virtual instrument concept in developing and controlling the measurement setup for LFNS experiments. An example of a noise map obtained for polymer thick-film resistors (PTFRs), made of commercial compositions, for temperature range 77 K - 300 K has been shown. Th
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35

Kim, Youngsang, and Hyunwook Song. "Noise spectroscopy of molecular electronic junctions." Applied Physics Reviews 8, no. 1 (2021): 011303. http://dx.doi.org/10.1063/5.0027602.

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Nadezhdinskii, A. I., Ya Ya Ponurovskii, D. B. Stavrovskii, and Yu P. Shapovalov. "Flicker Noise in Diode Laser Spectroscopy." Physics of Wave Phenomena 28, no. 4 (2020): 362–68. http://dx.doi.org/10.3103/s1541308x20040093.

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LI Chen, 李晨, 丁畅 DING Chang, 张桐耀 ZHANG Tong-yao, 曹丹华 CAO Dan-hua, 吴裕斌 WU Yu-bin, and 陈院森 CHEN Yuan-sen. "Tunable High-speed Spin Noise Spectroscopy." Acta Sinica Quantum Optica 23, no. 3 (2017): 228–31. http://dx.doi.org/10.3788/jqo20172303.0003.

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McIntyre, D. H., J. Cooper, R. Walser, and C. E. Fairchild. "Diode-laser noise spectroscopy of rubidium." Optics Letters 18, no. 21 (1993): 1816. http://dx.doi.org/10.1364/ol.18.001816.

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DiNitto, Julie M., and John M. Kenney. "Noise Characterization in Circular Dichroism Spectroscopy." Applied Spectroscopy 66, no. 2 (2012): 180–87. http://dx.doi.org/10.1366/11-06417.

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Kim, Youngsang, and Hyunwook Song. "Noise spectroscopy of molecular electronic junctions." Applied Physics Reviews 8, no. 1 (2021): 011303. http://dx.doi.org/10.1063/5.0027602.

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Vemuri, Gautam. "Noise spectroscopy of randomly modulated atoms." Journal of Chemical Physics 115, no. 21 (2001): 9912–22. http://dx.doi.org/10.1063/1.1416869.

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Misono, M., H. Fujimoto, T. Kohmoto, Y. Fukuda, and M. Kunitomo. "Correlation spectroscopy with noise light excitation." Physics Letters A 240, no. 1-2 (1998): 29–36. http://dx.doi.org/10.1016/s0375-9601(98)00043-7.

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Madenach, Armin J., and Jürgen H. Werner. "Noise spectroscopy of silicon grain boundaries." Physical Review B 38, no. 18 (1988): 13150–62. http://dx.doi.org/10.1103/physrevb.38.13150.

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Kohmoto, T., T. Murakami, Y. Fukuda, and M. Kunitomo. "Noise excitation spectroscopy in Rb atoms." Progress in Crystal Growth and Characterization of Materials 33, no. 1-3 (1996): 367–70. http://dx.doi.org/10.1016/0960-8974(96)83673-4.

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Grafov, B. M., Yu A. Dobrovolskii, A. L. Klyuev, A. E. Ukshe, A. D. Davydov, and E. A. Astaf’ev. "Median Chebyshev spectroscopy of electrochemical noise." Journal of Solid State Electrochemistry 21, no. 3 (2016): 915–18. http://dx.doi.org/10.1007/s10008-016-3395-0.

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46

Kozlov, G. G. "Noise spectroscopy of an optical microresonator." Journal of Experimental and Theoretical Physics 116, no. 5 (2013): 749–54. http://dx.doi.org/10.1134/s1063776113040055.

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Greenhalgh, D. A., and S. T. Whittley. "Mode noise in broadband CARS spectroscopy." Applied Optics 24, no. 6 (1985): 907. http://dx.doi.org/10.1364/ao.24.000907.

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Fiala, Pavel, Petr Drexler, Dusan Nespor, Zoltan Szabo, Jan Mikulka, and Jiri Polivka. "The Evaluation of Noise Spectroscopy Tests." Entropy 18, no. 12 (2016): 443. http://dx.doi.org/10.3390/e18120443.

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Abdullaev, N. T., O. A. Dyshin, and M. M. Gasankulieva. "Flicker Noise Spectroscopy of Electrocardiographic Signals." Biomedical Engineering 49, no. 5 (2016): 268–73. http://dx.doi.org/10.1007/s10527-016-9546-x.

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Wang, Xing-Ping, Gang Zhao, Kang Jiao, et al. "Uncertainty of optical feedback linear cavity ringdown spectroscopy." Acta Physica Sinica 71, no. 12 (2022): 124201. http://dx.doi.org/10.7498/aps.70.20220186.

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Cavity ring-down spectroscopy (CRDS) is a highly sensitive molecular absorption spectroscopic technology, which has been widely used in mirror reflectance measurement, atmospheric trace gas detection, molecular precision spectroscopy and other fields. It deduces the intracavity absorption by measuring the rapid variation of the ringdown signal. As a result, detector with high linearity, broad bandwidth and low electrical noise is indispensable. Additionally, owing to the large noise in laser frequency, low laser-to-cavity coupling efficiency is obtained. Consequently, the cavity transmission i
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