Disc medium high-energy ultrashort pulse laser regenerative amplifier based on CPA technology

Abstract

The invention discloses a disc medium high-energy ultrashort pulse laser regenerative amplifier based on a CPA technology, and the amplifier comprises a femtosecond laser seed light source which is used for providing femtosecond seed light; the chirp fiber bragg grating is used for broadening the femtosecond seed light into nanosecond laser pulses; the optical coupling input / output device is used for performing coupling input on the nanosecond laser pulse and performing coupling output on the amplified nanosecond laser pulse; the regenerative amplification laser cavity is used for performing regenerative amplification processing on the coupled and input nanosecond laser pulse; the optical coupling input / output device comprises an optical fiber coupling collimation module, an optical isolator, a first 1 / 2 wave plate and a thin film polaroid; the regenerative amplification laser cavity comprises a Pockels box, a second 1 / 2 wave plate, a first reflection module, a second reflection module, a first telescopic module, a second telescopic module, a first disc gain medium, a second disc gain medium and a third reflection module. The regenerative amplifier provided by the invention can realize laser pulse output with high repetition frequency and high pulse energy.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a disc medium high-energy ultra-short pulse laser regeneration amplifier based on CPA technology. Background technique [0002] The current rapid development of solutions for thermal management and dispersion management of ultrafast lasers has enabled novel system designs to deliver high average and peak powers and pulse energies. Some laser systems can extend the pulse energy to tens or even hundreds of millijoules. In general, there are mainly the following implementation methods: [0003] The plate laser, which produces sub-picosecond pulses with an average power of more than 1 kW at a repetition rate of tens of MHz, can generate a pulse energy of 20 mJ at 12.5 kHz. However, due to the strong asymmetric thermal lensing effect, the increase in average power often comes at the expense of degraded beam quality. [0004] Fiber lasers provide very good beam quality (M2<1.2) ...

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Problems solved by technology

[0005] The ultra-low temperature cooling of the laser working material can realize the pulse energy of tens of mJ at the repetition rate of kilohertz, but at the cost of greatly reducing the gain bandwidth

Moreover, the current mainstream technologies have technical limitations in realizing ultrashort laser pulses of 100 millijoules or the system is too complicated.

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