In-cavity pump light parameter oscillator with fiber laser as pumping source

Abstract

The invention discloses an in-cavity pump light parameter oscillator with a fiber laser as a pumping source. A pumping source emits in-band laser which is absorbed by a single mode gain fiber, the laser enters the single mode gain fiber via a pump combiner to form population inversion, and laser oscillation is formed in a fiber laser resonant cavity. A non-linear crystal is arranged in the fiber laser resonant cavity, and the in-cavity oscillation laser passes through the non-linear crystal to generate OPO signal light and an OPO idle light. A resonant cavity of the OPO signal light is partially overlapped with the fiber laser resonant cavity, so that the OPO oscillator threshold can be effectively reduced and the power conversion efficiency is improved. The non-linear crystal is arranged between a pair of curved surface mirrors, and an output coupling mirror and a high reflection mirror are used to enhance the cavity length of the OPO signal cavity, so that the light spot area of the OPO signal and the pump light in the non-linear crystal is reduced, and the OPO oscillator threshold is further reduced. Therefore, the OPO oscillator threshold is effectively reduced, the OPO power conversion efficiency is improved, and the structure is simple.

Description

technical field

[0001] The invention relates to the field of optical parametric oscillators, in particular to an intracavity pumped optical parametric oscillator with a fiber laser as a pumping source. Background technique

[0002] The optical parametric oscillator (OPO) uses the second-order nonlinear effect to convert the incident laser light, called the pump light, into two outgoing laser lights with different frequencies, one of which has a higher frequency is called signal light, and the other has a lower frequency. Called the idler light, the frequency of the pump light is equal to the sum of the frequencies of the signal light and the idler light; the optical parametric oscillator is used to expand the output band of laser radiation and realize broadband tunable laser radiation.

[0003] Continuous wave single-resonant optical parametric oscillators generally use fiber amplifiers as pump sources; longer period-polarized nonlinear crystals, such as periodically-polariz...

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