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A Miniaturized Three-Cavity Mirror Ring Cavity Mid-infrared Optical Parametric Oscillator

A technology of parametric oscillator and ring cavity, which is applied in the field of lasers, can solve the problem that the four-cavity mirror ring cavity is not fully applicable, and achieve the effect of highlighting the substantive characteristics

Active Publication Date: 2017-03-15
北京华宇德信光电技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The miniaturized OPO puts forward strict requirements on volume, weight and reliability. The common four-chamber mirror annular cavity (rectangular or X-shaped) is not completely suitable, and needs to be optimized for miniaturization. This is the existing technology. deficiencies

Method used

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  • A Miniaturized Three-Cavity Mirror Ring Cavity Mid-infrared Optical Parametric Oscillator

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0021] The fiber laser 1 used as the pump source uses a 2mm pulsed fiber laser with an adjustable repetition rate of 1-100kHz and a pulse width of hundreds of nanoseconds. The polarization-maintaining fiber is used to achieve linear polarization output to achieve the phase matching condition of OPO.

[0022] The pump coupling system 10 realizes the collimation and beam expansion of the 2mm pulsed laser output from the fiber laser, and the front coupling lens 2 and the rear coupling lens 3 are coated with 2mm anti-reflection coatings on both sides.

[0023] The nonlinear crystal 8 in the ring cavity OPO5 adopts two ZGP crystals (ZnGeP2, zinc phosphorous germanium) placed opposite to each other in the direction of the optical axis to compensate for the walk-off compensation under the birefringence phase matching, and at the same time increase the gain length of the optical parametric conversion and reduce the Light threshold, improve conversion efficiency. OPO full reflection mi...

specific Embodiment approach 2

[0026] combine figure 1 Describe this embodiment. The difference between this embodiment and Embodiment 1 is that the nonlinear crystal adopts PPLN crystal (Periodically Poled Lithium Niobate, periodically poled lithium niobate), and the two transparent surfaces of the crystal are coated with pump laser and AR coating for parametric lasers. Since the PPLN crystal is based on quasi-phase matching, there is no walk-off effect, so there is no need for dual crystals for walk-off compensation. By designing the polarization period (single period, multi-period, fan-shaped period, mixed period), incident angle and operating temperature (usually room temperature to 200°C) of the PPLN crystal, it can be achieved within the phase matching condition and the PPLN absorption cut-off band. Continuous high-precision tuning near 1~4mm, and it is expected to achieve multi-band (≥2) and even supercontinuum mid-infrared laser output.

specific Embodiment approach 3

[0028] combine figure 1Describe this embodiment. The difference between this embodiment and Embodiment 2 is that the fiber laser 1 used as the pump source is a 1 mm pulsed fiber laser, and parameters such as repetition frequency, pulse width, and beam quality are similar to those in Embodiment 1. Both sides of the front coupling lens 2 and the rear coupling lens 3 in the pump coupling system 10 are coated with 1mm anti-reflection coatings. OPO full reflection mirror 9 has high transmittance for 1mm laser and high reflectivity for near-infrared signal light and mid-infrared idler light, and is placed at a certain angle. The OPO reflector 4 has high reflectivity for near-infrared signal light and mid-infrared idler light, and is placed at a horizontal angle. OPO output mirror 7 has high transmittance for 1mm laser, high transmittance for one of near-infrared signal light and mid-infrared idler light, and partial reflection for the other laser, or partial reflection for both las...

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Abstract

The invention provides a miniature three-endoscope ring cavity mid-infrared optical parametric oscillator. According to the technical scheme, the three- endoscope ring cavity structure is adopted, the inverse transformation effect is reduced, transformation efficiency is improved, system isolation is avoided, and the size of an OPO system is reduced. Compared with a four-endoscope ring cavity OPO, the three-endoscope ring cavity OPO reduces the light outlet threshold of a laser device, transformation efficiency is improved, the complexity of a ring cavity is reduced, reliability of the OPO system is improved, and the size and the weight of the OPO system are reduced at the same time.

Description

technical field [0001] The invention relates to laser technology, in particular to a miniaturized three-cavity mirror ring cavity mid-infrared light parametric oscillator. Background technique [0002] In the prior art, the known technology is that the 3-5 μm mid-infrared laser is widely used in the fields of national defense, scientific research and civilian use such as photoelectric countermeasures, atmospheric monitoring, molecular spectroscopy, and laser medical treatment. With the continuous expansion and deepening of application fields, tunable and miniaturized mid-infrared solid-state lasers with a certain power level have attracted much attention in recent years. Optical parametric oscillator (OPO) based on frequency conversion is one of the effective ways to generate high-power, tunable mid-infrared laser. [0003] The OPO system is mainly composed of a pump laser, a coupling isolation system, a nonlinear crystal and a resonant cavity mirror. The OPO is only compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/083H01S3/094G02F1/39
Inventor 张凯彭跃峰魏星斌罗兴旺彭珏高剑蓉李德明
Owner 北京华宇德信光电技术有限公司