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21 March 2023 Dynamical time-frequency analysis of wavelength-swept laser based on chirp-frequency signal decomposition
Chaoze Zhang, Laiyang Dang, Ligang Huang, Tao Zhu
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Proceedings Volume 12595, Advanced Fiber Laser Conference (AFL2022); 1259505 (2023) https://doi.org/10.1117/12.2666581
Event: Advanced Fiber Laser Conference (AFL2022), 2022, Changsha, China
Abstract
A new method to analyze the wavelength-swept laser spectrum is proposed with the laser energy decomposition to a series of chirp-frequency signals, which is realized by Fractional Fourier Transform (FRFT). It can be promising to obtain a spectrum-concentrated energy distribution. In the proof-of-concept experiment, we use the Delayed Self-Heterodyne (DSH) coherent detection system to get the wavelength-swept laser signal, and the narrow linewidth of a commercial wavelength-swept laser is tested with different sweep speeds from 0.93 nm/s to 1000.03 nm/s. We explore the influence of the time window width of FRFT with different sweep speeds. Specially, we further compare the spectra by FRFT and FT in different time window widths. The narrowest linewidths calculated by FRFT, and FT are 0.14 MHz and 0.84 MHz, respectively. Finally, we compared the dynamic analysis of FRFT and traditional Fourier transform. The proposed analysis method of laser dynamical parameters will promote the understanding of laser dynamics, and benefit for the optical precision measurement applications.
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Chaoze Zhang, Laiyang Dang, Ligang Huang, and Tao Zhu "Dynamical time-frequency analysis of wavelength-swept laser based on chirp-frequency signal decomposition", Proc. SPIE 12595, Advanced Fiber Laser Conference (AFL2022), 1259505 (21 March 2023); https://doi.org/10.1117/12.2666581
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KEYWORDS
Fourier transforms
Time-frequency analysis
Laser frequency
Fractional fourier transform
Laser applications
Precision optics
Precision measurement
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