Chirp spread laser pulse light spectrum shaping device and method

Abstract

A spectral shaping device and method for chirped and stretched laser pulses, the device consists of a mode-locked laser, a grating stretcher, a lens, a pulse sampler, a fiber beam splitter, a fiber amplifier, a synchronous photoelectric conversion device, a shaping electrical pulse generator and Composed of an integrated waveguide optical modulator, the invention can realize spectral pre-shaping of the chirped broadened pulse before amplification, and greatly reduces the gain narrowing effect in the chirped pulse amplification system. The device does not need complex optical paths and mechanical devices, is very convenient to change the shape of the spectrum, has flexible operation, high efficiency, and is easy to be embedded in a chirped pulse multi-stage amplification system.

Description

Technical field [0001] The invention relates to a chirped laser pulse, in particular to a chirped broadening laser pulse spectrum shaping device and a method thereof. technical background [0002] Chirped pulse amplification technology is often used in experimental devices that generate terawatts or even petawatts of ultra-short and super-strong laser pulses. The seed laser pulse is time-stretched in a stretcher, and then multi-stage amplification is performed. Since the power density of the expanded seed laser pulse is too low, the amplification stage is usually divided into two stages: high-gain pre-amplification and power amplification. In the high-gain pre-amplification stage, the gain narrowing effect of the laser medium usually results in the narrowing of the amplified laser pulse spectrum, so that the final amplified laser pulse cannot be compressed back to its original pulse width. The application of spectral pre-shaping technology can reduce the spectral narrowing effect...

AI Technical Summary

Problems solved by technology

In order to overcome the gain narrowing effect in the process of ultrashort laser pulse amplification, several spectral shaping methods have been proposed, such as loading narrow-band interference filters and quartz birefringent filters in the optical path, and using reflective variable pitch gratings. The method of realizing laser spectrum shaping, these methods meet the needs of the experiment to a certain extent, but there are still some problems, such as some sharp peaks in the shaped spectrum, it is cumbersome to change the shape of the spectrum, and the requirements for optical path adjustment accuracy are relatively high, stability Not good, device processing is more difficult, etc.

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