Laser phase modulation method capable of effectively suppressing amplitude frequency effect

Abstract

The invention discloses a laser phase modulation method capable of effectively suppressing an amplitude frequency effect. The laser phase modulation method comprises the following steps: (a) firstly, inputting single-frequency continuous laser generated by a single-longitudinal-mode laser to an amplitude modulator; (b) secondly, loading a microwave signal source to the amplitude modulator, and performing amplitude modulation on a direct current voltage source; (c) thirdly, inputting single-frequency pulse light output by the amplitude modulator to a phase modulator for spectrum widening; (d) finally, loading modulation of a non-sinusoidal radio frequency signal source to the phase modulator to obtain a Gaussian spectrum light pulse, wherein the non-sinusoidal radio frequency signal source is formed by reshaping a sinusoidal radio frequency signal proportionally. According to the laser phase modulation method capable of effectively suppressing the amplitude frequency effect, provided by the invention, the modulation of the non-sinusoidal radio frequency signal source is loaded to the phase modulator to obtain the Gaussian light pulse, so that the amplitude frequency effect after transmission and amplification can be better suppressed, and the flatness of spectral lines output by a system is greatly improved.

Description

technical field [0001] The invention relates to a laser phase modulation method, in particular to a laser phase modulation method which effectively suppresses the amplitude-frequency effect. Background technique [0002] In the inertial confinement fusion (ICF) laser driver, the phase modulation technology is usually used to broaden the spectrum of the single longitudinal mode laser to suppress the nonlinear effect (SBS) in the system, and the amplitude-frequency effect ( FM-AM) increased significantly. In the current high-power optical system, in order to effectively suppress stimulated Brillouin scattering (SBS), protect large-aperture quartz optical components, and improve the safe operation flux of the system, broadband light is used as the seed light source. A common way to generate broadband light is to introduce a phase modulation module to broaden the spectrum of a single longitudinal mode laser. The general method of broadening is to amplify the amplitude of the h...

AI Technical Summary

Problems solved by technology

However, the broadband light generated by this method will inevitably bring amplitude-frequency effect (FM-AM) during the transmission and amplification process of the system, that is, the frequency modulation (FM) of the optical pulse causes the amplitude modulation of the time-domain waveform of the optical pulse ( AM)

This effect causes the original smooth optical pulse to appear peak oscillation on the time domain waveform, which affects the shaping ability of the laser pulse and reduces the safe operating flux of the system.

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