Silicate glass high-gain low-nonlinearity all-fiber ultrashort pulse amplifier and amplification method

Abstract

The invention provides a silicate glass high-gain low-nonlinearity all-fiber ultrashort pulse amplifier and an amplification method, and solves the problem that an existing fiber chirped pulse amplification system is limited in output pulse energy, high in cost, complex in structure and poor in stability. The amplifier comprises an optical fiber pre-amplification system, a second optical fiber circulator, a photoelectric detection module, a CPLD frequency acquisition module, an emergency control module, a high-power beam combiner, at least one high-power LD and driving module, a silicate glassoptical fiber and a collimation isolation compression unit, wherein a first port and a third port of the second optical fiber circulator are connected with the optical fiber pre-amplification systemand the input of the high-power beam combiner, a second port is connected with the photoelectric detection module, the CPLD frequency acquisition module and the emergency control module, and the pumping end and the output end of the high-power beam combiner are respectively connected with the high-power LD and the silicate glass optical fiber; the CPLD frequency acquisition module acquires repetition frequency of converting an optical signal of the second port into a pulse electric signal by the photoelectric detection module; and the driving module turns off the high-power LD according to a signal sent by the emergency control module.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a high-power and high-energy chirped pulse amplifier based on all-fiber integration of ytterbium-doped silicate glass fiber, and an amplification monitoring and damage protection method for the high-gain silicate amplifier. Background technique [0002] During femtosecond pulse processing, the thermal effect is small, the processing accuracy is high, and there is no obvious selectivity of processing materials, which has attracted great attention in the field of high-precision precision micromachining. In order to effectively improve the material processing efficiency of femtosecond amplifiers, it is necessary to simultaneously achieve high-energy femtosecond output at high repetition rates, that is, to solve the contradiction between high-power and high-energy simultaneous output. [0003] In the fiber chirped pulse amplification system, the fiber laser, single-shot serial amplifi...

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Problems solved by technology

[0004] In order to solve the technical problems of limited output pulse energy, high cost, complex structure and poor stability caused by strong nonlinearity in existing optical fiber chirped pulse amplification systems, the present invention provides a silicate glass high-gain, low-nonlinear full Optical fiber ultra-short pulse amplifier and amplification method, based on highly doped, short-length ytterbium-doped silicate glass fiber as the amplification medium, to achieve an all-fiber integrated femtosecond chirped pulse amplification system with high power and high energy simultaneous output

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