Chirp spread laser pulse light spectrum shaping device and method

Abstract

The invention relates to a spectral shaping device and a method of a chirp widening laser pulse. The spectral shaping device comprises a mode-locked laser, a raster stretcher, a lens, a pulse sample, an optical fiber splitter, an optical amplifier, a synchronous photoelectric converter, a shaping electrical pulse generator and an integrated guided-wave electro-optical modulator. The invention can perform the spectral pre-shaping of the chirp widening laser pulse before amplification, thus greatly decreasing gain narrowing effect in a chirp pulse amplification system. The spectral shaping device does not need complex light paths and machinery and spectral shape is easy to be changed. In addition, the spectral shaping device has flexible operation and high efficiency and is easy to be embedded into the multi-stage amplification system of the chirp pulse.

Description

technical field [0001] The invention relates to a chirped laser pulse, in particular to a chirped and stretched laser pulse spectrum shaping device and method thereof. technical background [0002] Chirped pulse amplification technology is often used in experimental devices for generating ultra-short and ultra-intense laser pulses of terawatts or even petawatts. The seed laser pulses are time-stretched in a stretcher, and then multi-stage amplified. Because the power density of the broadened 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 amplified laser pulse spectrum is usually narrowed due to the gain-narrowing effect of the laser medium, so that the final amplified laser pulse cannot be compressed back to the original pulse width. The application of spectral pre-shaping technology can reduce the spectral narrowing effect, so as to a...

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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