Time domain measurement method and system for ultrafast pulses with large pump bandwidth based on time-frequency multiplexing
An ultra-fast pulse, time-domain measurement technology, applied in measurement devices, photometry, optical radiation measurement, etc., can solve problems such as limiting pump bandwidth
Active Publication Date: 2021-09-21
SOUTH CHINA UNIV OF TECH
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However, due to the limitation of dispersion flatness, the nonlinear parametric process only has a measurement bandwidth of about 20nm, which limits the pump bandwidth.
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[0043] In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention.
[0044] A time-domain measurement method for ultrafast pulses with large pump bandwidth based on time-frequency multiplexing, comprising the following steps:
[0045] A. A signal light pulse to be measured with a repetition frequency of f passes through the dispersive component 1 at the input end to form a probe light;
[0046] B. The laser 2 produces a pulsed light source with a repetition frequency of f. The pulsed light source is a pulsed light with a large spectral bandwidth Δλ. The amplitude modulator 3 samples the repetition frequency from f to f / N, and N is a positive integer;
[0047] C. The pulse light source with a repetition frequency of f / N passes through the dispersion component 5 at the pump end to form pump light, and then splits the light through the s...
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The invention discloses a large pump bandwidth ultrafast pulse time-domain measurement method and system based on time-frequency multiplexing. The method includes: the pump pulse signal light having a large spectral bandwidth and a repetition frequency f undergoes frequency reduction and then the repetition frequency It becomes f / N, and the pump light is obtained after dispersion at the pump end. After spectral splitting, time delay, and optical beam combining, time-frequency multiplexing pump light with a repetition frequency of f is generated; the signal light to be measured is dispersed through the input end. Finally, the detection light is obtained; the time-frequency multiplexing pump light and the detection light beam enter the nonlinear medium, and through the nonlinear parametric process, the pump light applies a periodic secondary phase modulation in the time domain to the detection light, and the time-frequency multiplexing is obtained. The idler light of the time-frequency multiplexing is filtered out, and the time-domain amplified signal is obtained through the dispersion at the output end; the complete time-domain information of the pulse to be measured is obtained through high-speed data acquisition and signal reconstruction processing, realizing Real-time time-domain measurements of wide-bandwidth ultrafast pulses.
Description
technical field [0001] The invention relates to the field of ultrafast signal measurement, in particular to a large pump bandwidth ultrafast pulse time domain measurement method and system based on time-frequency multiplexing. Background technique [0002] With the further reduction of laser pulse duration, researchers continue to explore ultrafast pulse measurements such as autocorrelation technology, dispersive Fourier transform technology, time lens technology, frequency-resolved optical switch technology and spectral phase coherent direct electric field reconstruction method. technology to analyze important information such as time domain, frequency domain and phase of ultrafast pulses. [0003] Among them, the time lens technology amplifies ultrafast pulses in the time domain through an analog space lens system, avoiding the problem of insufficient sampling rate of existing electronic equipment, and realizing real-time time domain measurement of ultrafast pulses, which ...
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IPC IPC(8): G01J11/00G01J3/28G01J3/02
CPCG01J3/0218G01J3/0229G01J3/2889G01J11/00G01J2001/4238
Inventor 杨中民文晓晓孙悦怡韦小明
Owner SOUTH CHINA UNIV OF TECH