Inner-cavity single-resonance optical parametric oscillator of fiber laser pump

Abstract

The invention discloses an inner-cavity single-resonance optical parametric oscillator of a fiber laser pump. A pump source emits single-mode gain optical fiber to absorb pump light in a band, and after being focused by a coupling lens and passing through a dichroic mirror, the pump light enters the single-mode gain optical fiber. After the single-mode gain optical fiber absorbs the pump light, population inversion is formed, and laser oscillation is formed in a laser resonance cavity which is composed of a laser fully-reflecting mirror, the dichroic mirror and an SRO output mirror. A non-linear crystal is arranged in the resonance cavity of an optical fiber laser device, and nonlinear gain is provided. Signal light oscillation is formed in an SRO resonance cavity which is composed of the SRO output mirror and the SRO fully-reflecting mirror and is output by the SRO output mirror. According to the inner-cavity single-resonance optical parametric oscillator of the fiber laser pump, the single-mode optical fiber laser device is used as the pump light of an inner-cavity SRO, the pump source of the SRO is forced to operate in a fundamental transverse mode through the structural features of the single-mode gain optical fiber, and therefore the problems that since the heat effect in a traditional inner-cavity SRO causes degradation of the quality of a pump light beam and the degradation is difficult to compensate, the conversion efficiency of the SRO and the quality of the output light beam are influenced are solved.

Description

technical field [0001] The invention relates to the field of optical parametric oscillators, in particular to an inner-cavity single-resonance optical parametric oscillator pumped by a fiber laser. Background technique [0002] Optical parametric oscillator (OPO) is an effective means to expand the wavelength range of laser radiation and obtain tunable coherent light sources. In order to ensure the stability of the output power and spectrum, most of the optical parametric oscillators in practical applications adopt the single resonance mode. An obvious disadvantage of single-resonant optical parametric oscillators (SROs) is that the threshold is high, and high down-conversion efficiency can only be achieved after the pump power is significantly higher than the threshold; Low "Stable, continuous-wave, intracavity, optical parametric oscillator pumped by a semiconductor disk laser (VECSEL), Opt. Express, 17, 10648-10658, 2009". [0003] In order to solve this problem, on the...

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Problems solved by technology

[0005] The invention provides an intracavity single-resonance optical parametric oscillator pumped by a fiber laser, and the invention solves the problem that the quality of the pumping light beam of the traditional intracavity single-resonance optical parametric oscillator deteriorates and affects the conversion efficiency of SRO and the quality of the output beam , see the description below:

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