Medium infrared parameter converter

An optical parametric oscillator, infrared light technology, applied in the laser field, can solve the problems of poor output laser beam quality, large pump light spot, limited coating level, etc., to reduce quantum number deficit, high nonlinear coefficient, high The effect of conversion efficiency

Active Publication Date: 2010-12-22
NO 717 INST CHINA MARINE HEAVY IND GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above that it is difficult to obtain high-power mid-infrared lasers by directly pumping the KTA optical parametric oscillator at 1.06 μm
[0005] 3. The US patent "monolithic serial optical parametric oscillator" (Patent No. US6344920 B1) uses a 1.06μm laser to pump the first-stage non-critical phase-matched KTA optical parametric oscillator to generate a 1.53μm eye-safe laser, and then uses a 1.53μm eye-safe Laser-pumped second-stage non-critical phase-matched KTA optical parametric oscillator to achieve 2.59μm signal light and 3.76μm idler light output. This method increases the wavelength of pump light to make the quantum number loss between signal light and idler light Reduced, thereby improving the conversion efficiency of mid-infrared idler light. In this patent, the two-stage optical parametric oscillator shares a resonant cavity through the method of lens coating, which simplifies the structure but increases the difficulty of coating
At present, the coating level i

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0035] As shown in the figure: a mid-infrared optical parametric converter, the components arranged in sequence on the main optical path are: laser 1, spectroscopic device 2, mid-infrared optical parametric oscillator 3, two-color coupling mirror 4, mid-infrared optical parametric amplifier 5 The spectroscopic device 2 includes a wave plate 2.1, a polarizing device 2.2, and a spectroscopic reflector 2.3; in the direction of light path transmission of the spectroscopic reflector 2.3, the eye-safe optical parameter converter 6, the eye-safe laser reflector 7, and the human eye are successively Safety laser delay device 8; the laser 1 is a pump laser, and the light splitting device 2 divides the pump light into two paths: one path to pump mid-infrared light parametric oscillator 3 to generate mid-infrared light parametric seed light, and the other path To pump the eye-safe optical parameter converter 6 to generate eye-safe laser; the mid-infrared seed light is time-synchronized wi...

Embodiment 2

[0037] Different from Example 1, as attached Figure 5 As shown, the eye-safe optical parametric oscillator 6.1 is a ring resonator KTA optical parametric oscillator. 6.14. The input mirror of the eye-safe optical parametric oscillator of the ring cavity is composed of 6.15, the mirror one of the eye-safe optical parametric oscillator of the ring cavity 6.16 and the mirror two of the eye-safe optical parametric oscillator of the ring cavity 6.17. The remaining pump light from the oscillator 6.1 and the generated eye-safe signal light 1.53 μm enter the eye-safe optical parametric amplifier 6.2 together. The signal light 1.53μm is amplified and output, the cut angle of the KTA crystal in the eye-safe optical parametric oscillator 6.1 and the eye-safe optical parametric amplifier 6.2 is θ=90°, Ф=0°, both ends are coated with 1.06μm, 1.4~ 1.6 μm antireflection coating, and the Y-axis direction of the KTA crystal is parallel to the polarization direction of the 1.06 μm pump light ...

Embodiment 3

[0039] The difference from Embodiment 1 is: the mid-infrared optical parametric oscillator 3, the eye-safe optical parametric converter 6 and the mid-infrared optical parametric amplifier 5, wherein the mid-infrared optical parametric oscillator 3 is critical phase matching KTA light Parametric oscillator, the laser output wavelength is 3.95 μm; the KTA crystal cutting angle of the eye-safe optical parametric converter 6 and the mid-infrared optical parametric amplifier 5 is replaced by θ=90°, Ф=90°; the eye-safe optical parametric conversion The output wavelength of the amplifier 6 is 1.5 μm, and the output wavelengths of the mid-infrared optical parametric amplifier 5 are 3.95 μm and 2.42 μm.

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Abstract

The invention relates to a medium infrared parameter converter belonging to the technical field of laser and suitable for electro-optical countermeasures, chemical and biological threats detection, imaging laser radar, trace gas detection and the like. A main optical path of the medium infrared parameter converter is sequentially provided with a laser, a light splitting device, a medium infrared parameter oscillator, a two-color coupling mirror and a medium infrared parameter amplifier, wherein the light splitting device comprises a wave plate, a polarization element and a light splitting reflector; the laser is a pump laser, the light splitting device divides pump light into two paths, one path is pumped into the medium infrared parameter oscillator to generate medium infrared parameter seed light and the other path is pumped to a human eye safe light parameter converter to generate a human eye safe laser; and after subjected to time synchronization, the medium infrared seed light and the human eye safe laser enter the medium infrared parameter amplifier through the two-color coupling mirror. The invention has the advantage of providing the medium infrared parameter converter of high light beam quality and high-energy medium infrared laser output.

Description

technical field [0001] The invention relates to a mid-infrared optical parameter converter, which belongs to the field of laser technology, specifically relates to mid-infrared nonlinear frequency conversion technology, optical parametric oscillator / amplifier technology, and is suitable for photoelectric countermeasures, biochemical threat detection, imaging laser radar, trace gas detection etc. Background technique [0002] The mid-infrared laser in the 3-5μm band is a window of the atmosphere, which has strong penetrating power to fog, smoke and dust, etc., and is less absorbed by gas molecules and scattered by suspended matter when transmitted at sea level, and is sensitive to most important hydrocarbon gases. and other toxic molecules have cavity-absorbing properties. Therefore, using these characteristics of mid-infrared lasers, the 3-5 μm band can be used in technical fields such as photoelectric countermeasures, biochemical threat detection, imaging lidar, and trace ...

Claims

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Application Information

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IPC IPC(8): G02F1/39H01S3/00
Inventor 刘在洲杨长城孙峰赵翔张熙东芳
Owner NO 717 INST CHINA MARINE HEAVY IND GRP
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