Multi-pass chirped fiber grating pulse broadening device

Abstract

Disclosed is a Multi-pass chirped fiber grating pulse broadening device for. The device comprises a wide-spectrum signal source, a 2*2 acoustic optical modulator, an optical fiber circulator, a chirped fiber grating, an optical fiber isolator, gain media, a wavelength division multiplexer, a band-pass filter, a general control trigger signal source, a digital pulse delay generator, a pumping protector and a pumping source. The device has the advantages that pulse broadening of large dispersion measures can be achieved through the short chirped fiber grating, the broadening amount can be adjusted freely by controlling the broadening times through gate signals generated by the digital pulse delay generator, and accordingly, the cost is reduced effectively, all-fiber is achieved, the structure is compact, and energy losses in a broadening process are compensated.

Description

Technical field [0001] The present invention relates to a broad-spectrum laser pulse, in particular to a multi-path chirped fiber grating pulse broadening device suitable for time broadening of a broad-spectrum laser pulse. Background technique [0002] In recent years, due to the appearance of high-power pump sources and the improvement of fiber manufacturing level, fiber lasers are no longer limited to low-power levels. High-energy optical pulses are usually difficult to obtain directly from lasers, and one or more amplifiers are required to amplify the pulses from the outside. However, as the peak power of the pulse increases, the nonlinear effect in the amplifier will distort the pulse and limit the energy. Zoom in. The chirped pulse amplification technology introduces chirp and expands before pulse amplification, thereby effectively reducing the peak power of the pulse and realizing high-energy pulse amplification. The use of chirped fiber gratings for pulse broadening can...

AI Technical Summary

Problems solved by technology

The use of chirped fiber gratings for pulse stretching can achieve full fiber optics and make the system compact, and the stretching amount and price of chirped fiber gratings are proportional to the length of chirped fiber gratings, so the cost of pulse stretching with large dispersion higher

Images