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High-Precision Laser Spectrum Analyzer via Digital Decoherence
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DOI：10.1002/lpor.202501773.png)
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Abstract
En 中文
With the continuous advancement of laser technology, accurately evaluating the noise spectrum of high-performance lasers has become increasingly challenging. In this work, we demonstrate a high-precision laser spectrum analyzer based on the proposed digital decoherence method, which can precisely measure the frequency noise spectrum of sub-Hz linewidth lasers. In addition, it has broad wavelength compatibility, which enables convenient switching between lasers with different center wavelengths. Its performance is validated through measurements of ultra-stable lasers. Based on the measured frequency noise power spectral density, a β-line linewidth is determined to be 570 mHz at a 10-s observation time, and the minimum observable linewidth is calculated to be 133 mHz. The system's noise floor is evaluated to be 210 mHz β-line linewidth at a 25-s observation time, and the minimum observable linewidth is 39 mHz.
Keywords:
digital decoherence
laser spectrum analyzer
phase noise measurement
sub-Hz linewidth
ultra-stable laser
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