An all-fiber lossless cascaded pulse stretcher

Abstract

The invention discloses an all-fiber no-loss cascade pulse stretcher. The all-fiber no-loss cascade pulse stretcher comprises at least one pump source, and a plurality of first units; each first unitcomprises an optical fiber circulator, a first widening module and a wavelength division multiplexer; the first end of the optical fiber circulator is used for receiving externally input pulse signallight while the second end is connected with the first end of the first widening module; the second end of the first widening module is connected with the first end of the wavelength division multiplexer; the second end of the wavelength division multiplexer is connected with the output end of the pump source; the third end of the optical fiber circulator is connected with the first end of the optical fiber circulator in the adjacent first unit; the third end of the optical fiber circulator in the last first unit is used as the output end of the pulse signal light; and the multiple first unitsare connected in a cascading manner to form a cascade structure. By virtue of the all-fiber no-loss cascade pulse stretcher, the dispersion measure requirement of a single CFBG can be distributed into multiple CFBGs to be realized in an overlaid manner, and the pulse signal light is amplified to compensate device loss, so that the widening amount can be infinitely increased in a no-loss condition.

Description

technical field [0001] The invention belongs to the field of laser technology, and more specifically relates to an all-fiber lossless cascaded pulse stretcher. Background technique [0002] A chirped pulse amplifier is a commonly used device for amplifying ultrashort (picosecond or femtosecond) pulses. Its principle is to first broaden the ultrashort pulse from the time domain, amplify it, and then compress it back to the ultrashort pulse. Since the peak power of the pulse after stretching is greatly reduced, it is especially suitable for use in optical fiber amplifiers with limited peak power. [0003] Chirped Fiber Bragg Grating (Chirped Fiber Bragg Grating, CFBG) is a commonly used pulse stretcher in chirped pulse amplifiers. Dispersion), can set the spectral reflectance and reflection curve, usually used together with fiber optic circulator, is widely used in the field of optical fiber communication and sensor; its disadvantage is that due to the limitation of the manuf...

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Problems solved by technology

[0003] Chirped Fiber Bragg Grating (Chirped Fiber Bragg Grating, CFBG) is a commonly used pulse stretcher in chirped pulse amplifiers. Dispersion), can set the spectral reflectance and reflection curve, usually used together with fiber optic circulator, is widely used in the field of optical fiber communication and sensor; its disadvantage is that due to the limitation of the manufacturing process, it will generate a large loss, and additionally introduce The loss of the fiber optic circulator; another disadvantage is that the amount of pulse stretching is limited, and it is impossible to realize a pulse stretcher based on CFBG with a large amount of dispersion

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