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A slab-pumped mid-infrared optical parametric oscillator

A parametric oscillator, pump light technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problem of difficulty in obtaining high-power mid-infrared laser output, deterioration of mid-infrared laser beam quality, and limiting laser pump power. and other problems, to achieve the effect of achieving high-power mid-infrared laser output, reducing damage probability, and high pump power

Active Publication Date: 2019-06-11
INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, the damage threshold of the PPLN crystal and the mid-infrared film layer, as well as the thermal effect of the PPLN crystal have an important impact on the output power of the mid-infrared laser. The main reason is that the pumping power of the laser is limited, even if a high conversion efficiency is obtained. Due to the limited pump power, it is also difficult to obtain high-power mid-infrared laser output
Finally, under high-power working conditions, due to the degradation of the quality of the pump laser beam, the thermal effect of the PPLN crystal will lead to the deterioration of the quality of the mid-infrared laser beam generated by the OPO, which is difficult to meet the application requirements

Method used

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  • A slab-pumped mid-infrared optical parametric oscillator
  • A slab-pumped mid-infrared optical parametric oscillator
  • A slab-pumped mid-infrared optical parametric oscillator

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0024] The seed laser 1 uses a fiber-coupled 808nm diode laser to end-pump an Nd-doped gain crystal to obtain several watts and a beam quality factor of M in a folded resonator. 2 Fundamental mode 1.064μm output of <1.5. The pulse modulation is realized through the acousto-optic Q switch in the cavity. By adjusting the gain, cavity length, Q switch parameters, etc., the pulse frequency of the seed laser can be adjusted from thousands of hertz to tens of kilohertz, and the pulse width is tens of nanoseconds to hundreds of nanoseconds. Seconds can be designed. Through the selection of the Nd crystal, the control of the polarization device in the resonator, etc., the seed laser can achieve linear polarization output to achieve the phase matching of the subsequent OPO system.

[0025] The slab amplifier system 2 is mainly composed of a beam shaping and transmission system, an isolation system, and a side-pumped Nd slab amplifier module. The beam shaping and transmission system i...

specific Embodiment approach 2

[0032] combine figure 1 and figure 2 Describe this embodiment. The difference between this embodiment and Embodiment 1 is that the seed laser 1 adopts a linear cavity system composed of a rod-shaped side pump module, such as figure 2 hint. In the figure, the pump total reflection mirror 8 is coated with a 1.064 μm total reflection film, and the pump output mirror 12 is coated with a 1.064 μm laser partial reflection film, which constitute the resonant cavity of the seed laser. The acousto-optic Q switch 9 realizes the pulse modulation of the seed laser, and the repetition frequency is adjustable from thousands of hertz to tens of kilohertz. The gain medium of the rod side pumping module 10 is a uniformly doped Nd:YAG rod with a diameter of 2 mm and a length of 106 mm, and an 808 nm diode laser chip is uniformly irradiated on the side of the rod. The polarizer 11 is placed in the resonant cavity to ensure that the seed laser achieves linearly polarized output, thereby achi...

specific Embodiment approach 3

[0033] combine figure 1 This embodiment is described. The difference between this embodiment and Embodiments 1 and 2 is that a 1 mm pulsed fiber laser is used as the seed laser 1 , and parameters such as repetition frequency, pulse width, and beam quality are similar to those in Embodiment 1.

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Abstract

The invention provides a mid-infrared optical parameter oscillator of a slab pump. The mid-infrared optical parameter oscillator comprises a seed laser, slab amplifiers, a light beam shaping system and a PPLN-OPO system; pump light emitted by the seed laser passes through the slab amplifiers, the light beam shaping system and the PPLN-OPO system in sequence and is output; the pump light comprises near-infrared signal light, a mid-infrared idler beam and a near-infrared idler beam. According to the mid-infrared optical parameter oscillator of the slab pump, improvement and optimization are conducted according to laser types and parameters of an existing pump and matching parameters of an OPO, seed light is calibrated and amplified through slab power, and by means of beam shaping of a coupling system and pumping of the PPLN-OPO, mid-infrared laser output with high efficiency, high power and high beam quality is achieved.

Description

technical field [0001] The invention relates to laser application technology, in particular to a slab-pumped mid-infrared optical parametric oscillator. Background technique [0002] The 3-5μm mid-infrared laser is widely used in national defense, scientific research and civilian fields such as photoelectric countermeasures, atmospheric monitoring, molecular spectroscopy, and laser medical treatment. In recent years, with the continuous expansion and deepening of application fields, mid-infrared solid-state lasers with high efficiency, high power and high beam quality have broad development prospects. Thanks to the progress of mature solid-state laser technology and the improvement of nonlinear crystal quality, the optical parametric oscillator (OPO) based on frequency conversion is one of the effective ways to generate high-efficiency, high-power, and high-beam-quality mid-infrared lasers. At present, the most widely used and the highest output power is the technical route...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/102H01S3/094
CPCH01S3/094H01S3/1024
Inventor 魏星斌彭跃峰罗兴旺周唐建高剑蓉
Owner INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS