Intracavity pumped continuous wave optical parametric oscillator pumped by semiconductor laser

Abstract

The invention discloses an optical parametric oscillator for an inter-cavity pumping continuous wave of a semiconductor laser pump. The optical parametric oscillator comprises a single transverse-mode semiconductor laser, a focusing lens, an input coupling mirror, a laser grain crystal, a laser concave mirror, a dichroic mirror, a first concave mirror, a non-linear crystal, a second concave mirror, an optical parametric oscillator (OPO) signal light output coupling mirror and an OPO pumping light high-reflection mirror, wherein OPO pumping light generated by the laser grain crystal is focused on the laser grain crystal under effects of the input coupling mirror and the laser concave mirror, and the laser grain crystal is Yb:KYW or Yb:KGW. A three-level ytterbium-doped laser grain crystal is employed, the quantum defect during the laser generation process is relatively low, higher power conversion efficiency can be acquired, and meanwhile, less heat is generated during the laser generation process; the single transverse-mode and high-brightness semiconductor laser is used as a pumping source, and population inversion can be efficiently acquired in the three-level laser grain medium; and the other advantage of employing the single transverse-mode semiconductor laser as the pumping source lies that laser output with low-intensity noise can be acquired.

Description

technical field [0001] The invention relates to the field of optical parametric oscillators, in particular to an intracavity pumped continuous wave optical parametric oscillator pumped by a semiconductor laser. Background technique [0002] The Optical Parametric Oscillator (OPO) uses the second-order nonlinear effect to convert the incident laser light (called pump light) into two outgoing laser light with different frequencies, one of which has a higher frequency is called signal light, and the other is called signal light. A lower frequency is called idler light, and the frequency of pump light is equal to the sum of the frequencies of signal light and idler light; OPO is used to expand the output band of laser radiation to achieve broadband tunable laser radiation. [0003] The optical parametric oscillator pumped in the cavity places a nonlinear crystal in the resonant cavity of the pump laser; using the high power density in the resonant cavity, the low-threshold oscil...

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Problems solved by technology

[0005] The object of the present invention is to provide a cavity-pumped single-resonance continuous-wave optical parametric oscillator directly pumped by a single-transverse-mode semiconductor laser, which overcomes the instability of the output power of the multi-mode laser and the lifetime of the energy level on the laser gain medium in the prior art. The life of the optical parametric oscillator is much longer than that of the pump light, which causes the problem of unstable output power of the optical parametric oscillator, and improves the problems of the laser generation process accompanied by more heat generation and low OPO power conversion efficiency in the prior art

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