Cylindrical-arranged pluse double-clad optical fibre amplifiers

Abstract

A pulse amplifier with dual-cladding multi-mode optical fibre arranged cylindrically use high-quality low-power pulse laser as seed light source. The external cladding on a tangent line is removed to form a pump window coupled with a strip of internal cladding. A semiconductor laser pump source and a focusing lens are opposite to it. The linearly polarized pulse laser from seed light source is converted to properly polarized pulse laser by 1 / 2 wave plate and 1 / 4 wave plate, which is coupled into one end of optical fibre. After amplified, a high-power laser is output from its another end. Its advantages are compact structure, efficient and uniform pumping, and high output power.

Description

Technical field: [0001] The invention relates to a laser, which is a cylindrically arranged pulsed double-clad optical fiber amplifier. The double-clad optical fiber is arranged in a cylindrical shape with a certain diameter as an amplifier, and the pulsed laser is used as a seed light source to form a high-energy output amplifier. , High beam quality pulsed double-clad fiber amplifier. Background technique: [0002] In Q-switched pulsed double-clad fiber lasers, the required short focal length aspheric microlenses and special acousto-optic modulators and their coupling are technical difficulties, and it is difficult to achieve high average power pulsed laser output in this way, see the previous Technology [Opt. Lett., 25(1), 2000, P37]. In fiber lasers and amplifiers, the pump light must enter the inner cladding to play a pumping role. In the prior art, the pulsed fiber laser or amplifier is focused so that the pump light enters both ends of the fiber, and the pump light ...

AI Technical Summary

Problems solved by technology

Another structure is to coil the optical fiber into the shape of a mosquito coil, and pump the fiber core by removing the side cladding, see the prior art [JP Patent No.9-174450] and [JP Patent No.9-289851 ], can increase the coupling of the pump light, but because the central part of the mosquito coil is much smaller than the peripheral part, it is technically complicated to achieve uniform pumping (that is, there is a pump source at a certain distance)

The simultaneous entry of pump light and seed light by using a dichromatic chip, see the prior art [CLEO2002, 591-592], has high requirements for a dichromatic chip that achieves high reflection of seed light and high transmittance of pump light, and must be realized at the same time The seed light enters the fiber core and the pump light enters the inner cladding, which is technically difficult

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