Coherent combination system based on mid-infrared light parameter amplifier

A parametric amplifier and coherent synthesis technology, applied in lasers, laser devices, laser parts, etc., can solve the problem that the phase modulator can only be placed before the main amplifier of the seed source, the injectable power of the phase modulator is limited, and the phase control of high-power lasers cannot be performed. and other problems, to achieve the effect of strong array expansion potential, high polarization degree, and easy line width

Inactive Publication Date: 2020-04-10
INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS
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AI Technical Summary

Problems solved by technology

The reason is that the coherent combination technology puts forward strict requirements on the phase control of the sub-beams, and the injection power of the phase modulator is limited, so it is impossible to directly control the phase of the high-power laser.
For a high-power optical parametric laser mid-infrared light source based on nonlinear frequency conversion, the phase modulator of the coherent combination system can only be placed before the main amplifier of the seed source, and the phase relationship between multiple parameters is complex during the nonlinear frequency conversion process. The phases of the three waves interact with each other in a parametric laser with a high degree of uncertainty

Method used

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  • Coherent combination system based on mid-infrared light parameter amplifier
  • Coherent combination system based on mid-infrared light parameter amplifier

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Embodiment 1

[0037] Such asfigure 1 As shown, a coherent combination system based on a mid-infrared optical parametric amplifier includes three parts: an optical parametric amplifier laser sub-beam module, an active phase control module, and a beam combination and photodetection feedback control module; wherein the optical parametric amplifier laser sub-beam includes There are three parts: pump source, seed source and optical parametric amplifier; the active phase control module includes the phase controller of the seed source; the beam combination and photodetection feedback control module consists of an optical path difference adjustment system, a photodetector, and a beam combiner for coherent synthesis and spectroscope composition.

[0038] The pump source adopts a multi-stage MOPA structure, and the pump source is composed of the low-power seed source of the pump source, the first beam splitter and the multi-stage amplification system of the pump source; the low-power seed source of th...

Embodiment 2

[0048] Preferably, the low-power mid-infrared seed source uses a narrow linewidth pulse mid-infrared parametric oscillator, wherein the infrared output laser linewidth is narrowed by inserting a grating, FP etalon, etc. into the mid-infrared parametric oscillator cavity to meet Coherent combination puts forward requirements on the sub-beam linewidth. By adjusting the crystal temperature, a tunable mid-infrared laser output with a central wavelength of 2-5 μm can be obtained. Correspondingly, the multi-stage amplification system of the seed source adopts a multi-stage optical parametric amplifier, and the parameters of the nonlinear crystal are consistent with those of the narrow-linewidth mid-infrared optical parametric oscillator of the seed source and the subsequent optical parametric amplifier. The PPLN crystal temperature of the system keeps the central wavelength of each beam of mid-infrared lasers consistent in the final coherent combination system. It should be noted th...

Embodiment 3

[0050] Preferably, the nonlinear crystal adopts PPLT crystal (Periodically Poled Lithium Tantalate, periodically poled lithium tantalate), PPSLT crystal (Periodically Poled Stoichiometric Lithium Tantalate, periodically poled stoichiometric lithium tantalate) or ZGP crystal (ZnGeP2, phosphorous germanium zinc). The phase matching conditions of the optical parametric amplifier can be met by designing the polarization period (single period, mixed period, sectoral period, etc.) and operating temperature of the PPLT or PPSLT crystal, and by designing the parameters such as the cutting angle of the ZGP crystal. The wavelength band of the phase modulator and the coatings of various optical devices have been changed accordingly.

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Abstract

The invention relates to the field of laser array coherent combination, and discloses a coherent combination system based on a mid-infrared optical parametric amplifier. The system is composed of a phase-controllable optical parametric amplifier laser beamlet module, an active phase control module and a beam combination and photoelectric detection feedback control module; the optical parameter amplifier laser beamlet comprises three parts, namely a pumping source, a seed source and an optical parameter amplifier; and, when the power density ratio of the seed light to the pump light in the optical parametric amplifier meets a certain condition, the phases of the seed light and the output light have a determined relation, the phase of the seed light is adjusted through a phase modulator arranged in a seed source so as to lock the phase between light beams of the mid-infrared band optical parametric amplifier array, and active phase-locked coherent combination of mid-infrared light wavesis achieved. The optical parametric amplifier beamlet in the system has the advantages of high single-path output power, high conversion efficiency, high polarization degree, wide wavelength tuning range, easiness in line width control and the like.

Description

technical field [0001] The invention relates to the field of coherent combination of laser arrays, in particular to a coherent combination system based on a mid-infrared optical parametric amplifier. Background technique [0002] The 3-5μm band is an important band with the smallest attenuation and covers many atomic and molecular absorption peaks. This band is widely used in national defense, scientific research and civilian fields such as photoelectric countermeasures, atmospheric monitoring, terahertz field generation, free space optical communication, and laser medical treatment. Optical parametric laser technology based on frequency conversion is one of the effective ways to generate mid-infrared laser in the 1-5μm band. It is not easy to further increase the output power of the mid-infrared optical parametric oscillator due to the possible damage to the nonlinear crystal and mid-infrared coating caused by strong pumping energy. The power beam combining technology bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/10H01S3/13H01S3/23
CPCH01S3/10015H01S3/10053H01S3/1301H01S3/1305H01S3/1307H01S3/2308H01S3/2383
Inventor 彭珏孙殷宏魏星斌彭万敬王尧李蕊君李腾龙杨小波
Owner INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS
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