Seed spectrum shaping laser based on stretcher spatial chirp control and method

Abstract

This invention belongs to the field of laser technology, and specifically relates to a seed spectral shaping laser and method based on spatial chirp control of a stretcher. The stretcher receives the initial seed pulse and performs temporal stretching. By slightly deflecting at least one internal optical element relative to an ideal alignment state, while maintaining the temporal stretching function, it causes the output beam to form non-zero residual spatial dispersion, resulting in spatial separation of different wavelength components along a single lateral direction perpendicular to the grating lines, forming a controllable spatial chirp. A coupling unit is located after the output of the stretcher. Through lateral or axial position adjustment and effective receiving range control, it performs wavelength selective reception of the spatially chirped beam, outputting a seed spectrum with a target center wavelength, bandwidth, or spectral shape. This invention eliminates the need for an additional spectral shaping module, effectively suppressing spectral degradation during amplification and improving the final pulse quality.

Images