A Long-Wave Infrared Optical Parametric Oscillator with High Conversion Efficiency

Abstract

The invention discloses a long-wave infrared optical parametric oscillator with the high conversion efficiency. The long-wave infrared optical parametric oscillator comprises a pumping laser device, afirst beam coupling system, a medium-wave infrared optical parametric oscillator with a first nonlinear crystal, a first beam splitter, a laser polarization adjustment system, a second beam couplingsystem, a long-wave infrared optical parametric oscillator provided with a second nonlinear crystal, and a second beam splitter. The pumping laser device generates a pump laser output; the first nonlinear crystal carries out frequency conversion and the medium-wave infrared optical parametric oscillator carries out optical resonant cavity oscillation to realize a medium-wave infrared laser output;and the medium-wave infrared laser is processed by frequency conversion by the second nonlinear crystal and optical resonant cavity oscillation by the long-wave infrared optical parametric oscillator, so that long-wave infrared laser outputting is realized. According to the invention, the medium-wave infrared laser is used as fundamental-frequency light of the long-wave infrared optical parametric oscillator and the medium-wave infrared laser is filtered by the beam splitting effect of the first beam splitter, so that the long-wave infrared laser outputting is realized.

Description

technical field

[0001] The invention relates to the technical field of long-wave infrared optical parametric oscillators, in particular to a long-wave infrared optical parametric oscillator with high conversion efficiency. Background technique

[0002] Long-wave infrared laser sources are widely used in air pollution detection, photoelectric countermeasures and other fields. At present, the most common and effective way to obtain long-wave infrared laser output is to use zinc-germanium-phosphorus crystals (ZnGeP 2 , referred to as ZGP) Optical Parametric Oscillator (optical parametric oscillator, referred to as OPO) for frequency conversion of laser light in the band near 2μm. In the process of long-wave infrared optical parametric oscillation, a pump photon is converted into a signal photon and an idler photon through nonlinear frequency. The signal light radiation wavelength is 2.5-2.8 μm, and the long-wave infrared laser is idler light, with a wavelength coverage of 7- ...

Examples

specific Embodiment approach 1

[0020] Specific implementation mode one: combine figure 1 illustrate. The invention provides a long-wave infrared optical parametric oscillator with high conversion efficiency, including a pump laser, a first beam coupling system, a mid-wave infrared optical parametric oscillator provided with a first nonlinear crystal, a first beam splitter, and a laser polarizer Adjustment system (half-wave plate in this embodiment), the second beam coupling system, a long-wave infrared optical parametric oscillator provided with a second nonlinear crystal, and a second beam splitter; the pump laser generates a pump laser output, and passes through After the first beam coupling system transforms the diameter of the pump laser beam, it is incident into the mid-wave infrared optical parametric oscillator. Under the conditions of nonlinear parameter phase matching, it undergoes the first nonlinear crystal frequency conversion and mid-wave infrared optical parametric oscillation. The optical re...

specific Embodiment approach 2

[0038] Specific implementation mode two: combination figure 2 illustrate. The difference between this embodiment and the long-wave infrared optical parametric oscillator based on the mid-wave infrared pump described in the first embodiment lies in that the implementation of the mid-wave infrared optical parametric oscillator is different.

[0039] The invention provides a long-wave infrared optical parametric oscillator based on mid-wave infrared pumping, including a pump laser, a first beam coupling system, a mid-wave infrared optical parametric oscillator, a first beam splitter, a half-wave plate, and a second beam A coupling system, a long-wave infrared optical parametric oscillator, and a second beam splitter.

[0040] The mid-wave infrared optical parametric oscillator includes a grating (can be a blazed grating, a volume Bragg grating, etc., in this embodiment, a volume Bragg grating), a volume Bragg grating, a third input mirror, a first nonlinear crystal, a third out...

technical field

[0001] The invention relates to the technical field of long-wave infrared optical parametric oscillators, in particular to a long-wave infrared optical parametric oscillator with high conversion efficiency. Background technique

[0002] Long-wave infrared laser sources are widely used in air pollution detection, photoelectric countermeasures and other fields. At present, the most common and effective way to obtain long-wave infrared laser output is to use zinc-germanium-phosphorus crystals (ZnGeP 2 , referred to as ZGP) Optical Parametric Oscillator (optical parametric oscillator, referred to as OPO) for frequency conversion of laser light in the band near 2μm. In the process of long-wave infrared optical parametric oscillation, a pump photon is converted into a signal photon and an idler photon through nonlinear frequency. The signal light radiation wavelength is 2.5-2.8 μm, and the long-wave infrared laser is idler light, with a wavelength coverage of 7- ...

Examples

specific Embodiment approach 1

[0020] Specific implementation mode one: combine figure 1 illustrate. The invention provides a long-wave infrared optical parametric oscillator with high conversion efficiency, including a pump laser, a first beam coupling system, a mid-wave infrared optical parametric oscillator provided with a first nonlinear crystal, a first beam splitter, and a laser polarizer Adjustment system (half-wave plate in this embodiment), the second beam coupling system, a long-wave infrared optical parametric oscillator provided with a second nonlinear crystal, and a second beam splitter; the pump laser generates a pump laser output, and passes through After the first beam coupling system transforms the diameter of the pump laser beam, it is incident into the mid-wave infrared optical parametric oscillator. Under the conditions of nonlinear parameter phase matching, it undergoes the first nonlinear crystal frequency conversion and mid-wave infrared optical parametric oscillation. The optical re...

specific Embodiment approach 2

[0038] Specific implementation mode two: combination figure 2 illustrate. The difference between this embodiment and the long-wave infrared optical parametric oscillator based on the mid-wave infrared pump described in the first embodiment lies in that the implementation of the mid-wave infrared optical parametric oscillator is different.

[0039] The invention provides a long-wave infrared optical parametric oscillator based on mid-wave infrared pumping, including a pump laser, a first beam coupling system, a mid-wave infrared optical parametric oscillator, a first beam splitter, a half-wave plate, and a second beam A coupling system, a long-wave infrared optical parametric oscillator, and a second beam splitter.

[0040] The mid-wave infrared optical parametric oscillator includes a grating (can be a blazed grating, a volume Bragg grating, etc., in this embodiment, a volume Bragg grating), a volume Bragg grating, a third input mirror, a first nonlinear crystal, a third out...

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