Femtosecond laser pulse synchronous extraction device and method based on MZM intensity modulation

Abstract

The invention discloses a femtosecond laser pulse synchronous extraction device and method based on MZM intensity modulation. The method comprises the steps: generating synchronous clocks in one-to-one correspondence with the femtosecond laser pulses through a phase-locked loop; after the rising edge of the synchronous clock is delayed for a specific time, outputting a synchronous extraction pulse, amplifying the synchronous extraction pulse and then transmitting the synchronous extraction pulse to the MZM for modulation, and achieving the synchronous extraction of the optical pulse; detectingthe extracted optical pulse, performing filtering and amplifying to obtain a low-frequency signal with the frequency being the frequency of the extracted pulse and a high-frequency signal with the frequency being the repetition frequency of the femtosecond laser, and solving the amplitudes of the two signals by using a lock-in amplifier; carrying out the delay scanning until the amplitude of thelow-frequency signal reaches the maximum; and carrying out the bias scanning until the amplitude of the high-frequency signal is reduced to the minimum, so detection and suppression of optical pulse leakage are realized. According to the invention, the problems of pulse extraction failure and femtosecond laser leakage caused by desynchrony in the traditional method are solved, the femtosecond laser pulse extraction stability is improved, and the method can be widely applied to the technical field of optical pulse precision measurement.

Description

technical field [0001] The invention belongs to a laser pulse extraction device and method in the technical field of precision measurement, in particular to a femtosecond laser pulse synchronous extraction device and method based on Mach-Zehnder modulator (MZM) intensity modulation. Background technique [0002] Due to the advantages of traceable repetition rate and ultra-high time resolution, femtosecond laser is widely used in the fields of laser interferometry precision measurement and ultrafast imaging technology. Restricted by factors such as the laser cavity length, the femtosecond pulse repetition frequency output by the femtosecond laser is usually on the order of tens or even hundreds of MHz. Pulse for sparse extraction. The traditional optical pulse extraction method based on the Pockels cell (Pockels) uses the principle of electro-optic phase modulation to modulate the laser polarization state. When the polarization state is the same as the polarizer, the laser i...

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Problems solved by technology

[0005] In order to solve the problems existing in the background technology, the present invention discloses a femtosecond laser pulse synchronous extraction method based on MZM intensity modulation, which solves the pulse extraction failure caused by the asynchronous driving signal and femtosecond pulse in femtosecond laser pulse extraction and leakage problems, improve the stability of femtosecond laser pulse extraction, and can be widely used in the field of optical pulse precision measurement technology

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