Multistage ultrashort pulse laser step-by-step compression system

Abstract

The present invention belongs to the optical field, and particularly relates to a multistage ultra-short pulse laser stepped compression system. The multistage ultra-short pulse laser stepped compression system comprises the components of: an ultra-short laser pulse transmitter, a first-stage compression device and a second-stage compression device. The first-stage compression device comprises the components of: a pulse broadening device, a pre-amplifier, a dispersion amount compression element, a first collimating lens and a first-stage chirped grating; wherein the pulse broadening device, the pre-amplifier, the dispersion amount compression element, the first collimating lens and the first-stage chirped grating are successively arranged in a transmitting optical path of the ultra-short laser pulse transmitter. The second-stage compression device comprises the components of: a focusing lens, a main amplifier, a second collimating lens and a second-stage chirped grating; wherein the focusing lens, the main amplifier, the second collimating lens and the second-stage chirped grating are successively arranged in a diffraction optical path of the first-stage compression device. The multistage ultra-short pulse laser stepped compression system of the invention has the functions of: realizing stepped compression on the laser pulse with random broadening amount, and simultaneously greatly reducing compression loss amount of outputted high-energy laser.

Description

technical field [0001] The invention belongs to the field of optics, and in particular relates to a multi-stage ultrashort pulse laser step-by-step compression system. Background technique [0002] Ultrashort pulse high-energy laser is generally obtained by multi-stage laser amplifier combined with chirped pulse amplification technology. This chirped pulse amplification technology route includes laser pulse generation, pulse stretching, pulse energy amplification and pulse compression. The pulse amplification link includes multiple amplification branches, and these branches are serially divided into steps in this technology route. Each link plays the role of gradually amplifying the laser pulse step by step. The stretching link and the final compression link in the route are two sets of devices that echo back and forth. The former realizes the stretching of the pulse in time to generate long pulses; the latter provides the opposite function, compressing the long pulses to t...

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Problems solved by technology

However, each volume grating has a certain diffraction loss and material absorption loss for the light incident into it (the loss is about 40% in total). If multiple volume gratings are used, the overall loss of the compressor will double as the number of volume gratings increases. increase, which greatly reduces the overall efficiency of the laser system

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