High-power and tunable pulse fiber laser device

Abstract

The invention belongs to the technical field of laser devices, and provides a high-power and tunable pulse fiber laser device and a super-continuum spectrum light source pumped through the high-power and tunable pulse fiber laser device. The high-power and tunable pulse fiber laser device sequentially comprises a tunable passive mode-locking fiber laser device based on the fiber nonlinear effect, a broadband fiber coupler, a power pre-amplification stage and a power main amplification stage in the light path direction. The output end of the high-power and tunable pulse fiber laser device is connected with photonic crystal fibers or high nonlinear fibers or other super-continuum spectrum generating fibers with zero-dispersion wavelength located in the pumping laser gain area, precise matching of the pumping laser and the zero-dispersion wavelength of the super-continuum spectrum generating fibers can be achieved, and accordingly, a broadband and high flatness super-continuum spectrum light source can be obtained. The device has the advantages that the structure is simple, the tuning of the pumping laser wavelength is convenient, cost is low, and full fiber is achieved, and the device can be applied to the fields such as biomedicine, remote sensing, environment monitoring, multi-channel fiber communication and spectroscopy.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a high-power tunable pulse fiber laser based on an optical fiber nonlinear passive mode-locking seed source, and a supercontinuum light source pumped based on the high-power tunable pulse fiber laser. Background technique [0002] Ultra-broadband light sources have a wide range of needs in all aspects of life. As a conventional broadband light source, incandescent lamps and fluorescent lamps have a relatively wide spectral range, but the luminous brightness is low, and they are not coherent light, and the beam quality is also poor; although lasers have good spatial coherence and high brightness, and have good single-mode beam quality, but lasers are usually monochromatic. The supercontinuum light source based on laser pumping can solve this contradiction well. [0003] Supercontinuum (SC) refers to a beam of high-intensity laser pulses passing through a nonlinear med...

AI Technical Summary

Problems solved by technology

The generation of broadband flat supercontinuum has very strict requirements on the relative position of the pump wavelength and the fiber zero-dispersion wavelength: the pump laser wavelength should be located in the fiber anomalous dispersion region and as close as possible to the fiber zero-dispersion wavelength to facilitate the evolution of the pump. The short pulse extends to the normal dispersion region, and the deviation of more than 10nm between the two will lead to a significant decline in the spectral quality of the supercontinuum

However, due to the limitations of the fiber drawing process, there is a certain deviation between the zero dispersion wavelength of the actually drawn fiber and the designed fiber zero dispersion wavelength, and the current fiber lasers used for supercontinuum generation usually have a fixed laser wavelength. Therefore, there are many restrictions on the short-wave extension and flatness of the supercontinuum

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