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A Compound Optical Parametric Oscillator Based on Monolithic Nonlinear Crystal

A nonlinear crystal and optical parameter technology, applied in the laser field, can solve the problems of reducing the reliability and stability of the laser, complex laser system structure, increasing the number of optical devices, etc., achieving good spatial distribution characteristics, simplifying the optical path structure, and improving stability. sexual effect

Active Publication Date: 2022-06-07
武汉光谷航天三江激光产业技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the output wavelength of the fundamental frequency pump source used in nonlinear frequency conversion technology is usually around 1 μm or 2 μm. In order to convert the wavelength to the range of medium and long-wave infrared bands, it is often necessary to use more than two stages of frequency conversion devices. It will inevitably make the structure of the laser system more complex and costly, and further reduce the reliability and stability of the laser due to the increase in the number of optical devices

Method used

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  • A Compound Optical Parametric Oscillator Based on Monolithic Nonlinear Crystal
  • A Compound Optical Parametric Oscillator Based on Monolithic Nonlinear Crystal
  • A Compound Optical Parametric Oscillator Based on Monolithic Nonlinear Crystal

Examples

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Embodiment 1

[0029] The present invention is a composite optical parametric oscillator based on a monolithic nonlinear crystal, comprising:

[0030] Pump lasers, coupling-in mirrors, nonlinear crystals, and coupling-out mirrors;

[0031]The composite optical parametric oscillator includes a first optical parametric oscillator and a second optical parametric oscillator; the coupling-in mirror, the area where light passes between the first light-transmitting surface and the bottom surface of the nonlinear crystal (specifically It is the area where the light passes between the first clear surface and the bottom light reflection point M) and the coupling output mirror to form the first optical parametric oscillator; the coupling input mirror, the second clear surface of the nonlinear crystal and the bottom surface are The area through which the intermediate light passes (specifically, the area through which the light passes between the second light-transmitting surface and the light reflection...

Embodiment 2

[0055] This embodiment further describes Example 1. The left side of the coupling-in mirror described in this embodiment is coated with 2.09 μm antireflection film, and the right side is coated with 2.09 μm antireflection film and 2.8 μm and 4.3 μm high reflection films . The transmittance of the anti-reflection coating is greater than 99%, and the reflectivity of the high-reflection coating is greater than 99%. The rest of the contents are the same as those in Example 1.

Embodiment 3

[0057] This embodiment will further describe Example 2. The nonlinear crystal ZnGeP2 crystal described in this embodiment has both the first clear surface and the second clear surface plated with 2.09 μm, 2.8 μm, 4.3 μm and 8 μm wavelength bands. The cutting angle of the first clear surface is θ1=51.3°, and the cutting angle of the second clear surface is θ2=46.7°, so the first and second optical parametric oscillators are both type I phase matching , that is, o→e+e. The rest of the contents are the same as those in Example 2.

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Abstract

A compound optical parametric oscillator based on a monolithic nonlinear crystal of the present invention includes: a pump laser, a coupling-in mirror, a nonlinear crystal, and a coupling-out mirror; the compound optical parametric oscillator includes a first optical parametric oscillator and the second optical parametric oscillator; the coupling-in mirror, the region where light passes between the first light-passing surface and the bottom surface of the nonlinear crystal, and the coupling-out mirror constitute the first optical parametric oscillator; the coupling-in The mirror, the region through which light passes between the second light-passing surface and the bottom surface of the nonlinear crystal, and the outcoupling mirror form a second optical parametric oscillator. The present invention integrates two optical parametric oscillators into a resonant cavity based on a single crystal, which can simultaneously realize medium-wave and long-wave infrared laser output, greatly simplifies the optical path structure of traditional cascaded optical parametric oscillators, and effectively reduces optical The use of components improves the stability, reliability and compactness of the entire device while reducing costs.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a composite optical parametric oscillator based on a single nonlinear crystal. Background technique [0002] The mid- and long-wave infrared bands of 3-5μm and 8-12μm are two extremely important atmospheric windows. The atmospheric absorption and scattering losses of infrared radiation in this band are extremely small, and can be used in turbid air, smoke, fog, haze, rain, snow, etc. Effective transmission in harsh atmospheric environments, and these two bands cover the absorption peaks of many molecular gases, toxic agents, air, water and soil pollutants, human respiratory components, and many explosive agents, and this wavelength range is also mid- and long-wave infrared. The wavelength response range of the focal plane detector makes the mid- and long-wave infrared coherent radiation sources of these two bands have great application value in the fields of atmospheric monitoring...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/108H01S3/06H01S3/08
CPCH01S3/108H01S3/1083H01S3/08H01S3/0809H01S3/0606
Inventor 何苗张甦董程武春风李强姜永亮刘厚康宋祥韩瑬胡舒武
Owner 武汉光谷航天三江激光产业技术研究院有限公司
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