Continuous wave optical parametric oscillator with pumping resonance

Abstract

The invention discloses a continuous wave optical parametric oscillator with pumping resonance. The continuous wave optical parametric oscillator with the pumping resonance comprises a single frequency pump laser, a beam collimating unit, a first optical isolator, a pump input coupling mirror, a first concave mirror, a nonlinear crystal, a second concave mirror, a dichroic mirror, an optical band pass wave filter and an OPO signal light output coupling mirror. According to the continuous wave optical parametric oscillator, the non-linear crystal is directly placed between the two concave mirrors, and a smaller signal and a spot area of the pump light can be obtained by selecting the concave mirror with short focal length; the cavity length of the signal cavity and the pumping cavity is increased with a folded resonator. Therefore, the spot area of the signal and pump light in the non-linear crystal can be further reduced, and the extremely low oscillation threshold is realized, wherein the oscillation threshold value can be less than 60 MW, or even less than 30 MW. The continuous wave optical parametric oscillator with a low threshold value has the advantages of reducing the power requirement of the pump laser, being relatively simple in structure, and easy to realize miniaturization and practicability.

Description

technical field [0001] The invention relates to the field of optical parametric oscillators, more specifically, to a continuous wave optical parametric oscillator with pump resonance. 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 the signal light, and the other is called the signal light. A lower frequency is called the idler light, and 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 the laser radiation and generate broadband tunable laser radiation. [0003] A continuous wave optical parametric oscillator generally uses a fiber amplifier as a pump source; a longer periodically polarized nonlinear crystal, such as a pe...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a continuous wave optical parametric oscillator with a lower oscillation threshold (which can be lower than 60 milliwatts or even 30 milliwatts), so as to overcome the problems of high oscillation threshold and high requirements on the output power of the pumping system in the prior art

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