Saturable absorption optical fiber based all-fiber multi-wavelength passive Q-switched laser

Abstract

The invention discloses a saturable absorption optical fiber based all-fiber multi-wavelength passive Q-switched laser which comprises optical fiber devices of a pumping source, a wavelength division multiplexer, a gain fiber, an isolator, a saturable absorption optical fiber, an output coupler and the like; the wavelength division multiplexer, the gain fiber, the isolator, the saturable absorption optical fiber and the output coupler are sequentially spliced in a welded manner through a fusion splicer to form an optical fiber loop; the pumping source is spliced on the optical fiber loop in a welding manner through the wavelength division multiplexer. Multi-wavelength selection and passive Q-switch for the fiber laser b the aid of the saturable absorption optical fiber; multi-wavelength intervals can be adjusted according to the length of the saturable absorption optical fiber, the output frequency can be adjusted through the pumping source. The laser has the advantages of, strictly speaking, an all-fiber structure, compact size, stable output parameters, high environment adaptability and the like.

Description

technical field [0001] The invention relates to an all-fiber multi-wavelength passive Q-switching laser, in particular to a novel all-fiber multi-wavelength passive Q-switching laser based on a saturable absorption fiber. Background technique [0002] Multi-wavelength pulsed fiber lasers have very important applications in dense wavelength division multiplexing optical communications, optical sensing, spectroscopy, and optical information processing. [0003] To obtain multi-wavelength output, it is necessary to add a wavelength selective device in the laser system. The most commonly used is to use fiber grating to select the wavelength. The Chinese invention patent "A Multi-Wavelength Output Fiber Laser" (Patent No. ZL 01133233) provides a method and device for realizing multi-wavelength output by using an arrayed waveguide grating. The principle is to use the wavelength selectivity of the arrayed waveguide grating to realize the wavelength selection of the doped fiber la...

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Problems solved by technology

However, these methods are relatively complicated, mainly because the arrayed waveguide gratings, active phase-shifting

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