Laser spectrum automatic peak searching method based on two-stage peak searching

• Main Authors: WANG ZHAOYU, CAO CHAOYANG, LI GUANGHUI, CUI PEILING, ZHOU XINXIU, ZOU SHENG
• Format: Patent
• Language: Chinese; English
• Published: 28.05.2024
• Subjects: BASIC ELECTRIC ELEMENTS; CALCULATING; COLORIMETRY; COMPUTING; COUNTING; DEVICES USING STIMULATED EMISSION; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT; MEASURING; PHYSICS; RADIATION PYROMETRY; TESTING

The invention relates to a laser spectrum automatic peak searching method based on two-stage peak searching. According to the requirement of a semiconductor laser for frequency stabilization, the influence of the peak searching precision of a saturated absorption spectrum on the frequency stabilization precision is analyzed, a two-stage peak searching algorithm is provided, and the peak searching method comprises the steps that firstly, a frequency sweeping signal loaded with frequency modulation is applied to the laser, an optical signal is converted into an electric signal through a photoelectric detector, and spectral data is collected in real time through a DA chip. The method comprises the following steps: firstly carrying out filtering downsampling pretreatment on collected spectral data, then carrying out two-stage peak searching of five-point peak searching and Lorentz fitting peak searching, and finally obtaining a spectral peak value and a sweep frequency voltage corresponding to the peak value. Thr