A device used for generating high efficiency narrow linewidth intermediate infrared laser and a method

An infrared laser and narrow linewidth technology, applied in the direction of lasers, laser components, phonon exciters, etc., can solve the problems of reducing parameter conversion efficiency, increasing parameter oscillation threshold, and high cost, so as to reduce the difficulty of optical path adjustment and Cost, the effect of reducing the loss in the cavity

Active Publication Date: 2016-01-27
ZHEJIANG UNIV
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Problems solved by technology

However, its output light width is relatively wide, and it changes with the input light wavelength. The output high-power parametric light width is generally several nanometers to tens of nanometers.
[0004] The current research focus is to add spectral compression devices such as volume Bragg gratings and F-P etalon

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  • A device used for generating high efficiency narrow linewidth intermediate infrared laser and a method
  • A device used for generating high efficiency narrow linewidth intermediate infrared laser and a method
  • A device used for generating high efficiency narrow linewidth intermediate infrared laser and a method

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[0053] Example

[0054] The structure adopted in this embodiment adopts the combination of the above-mentioned multiple preferred modes, that is, as figure 1 The device shown was tested. The light emitted by the pump source 1 is split by the first polarizer 5, and the reflected light is incident on the sixth dichroic mirror 24 through the third reflector 10, the fourth reflector 11, the fifth reflector 12, and the sixth reflector 13. , the seventh dichroic mirror 25 and the OPO system composed of the first nonlinear crystal 31, select the first coupling lens 26 with a suitable focal length to focus the pump light on the center of the PPLN crystal, and control the spot diameter to 0.7mm to reduce the divergence angle, as Improve the conversion efficiency and reduce the threshold, the pump light is reflected by the seventh dichroic mirror 25 and passes through the first nonlinear crystal 31 again, and the first half-wave plate 2 is rotated to adjust the pump light power. When t...

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Abstract

The invention provides a device used for generating high efficiency narrow linewidth intermediate infrared laser and a method. The device comprises a pumping source, an OPO and two stages of OPAs. The device also comprises a coupling lens used for making idler frequency light and pumping light coincide and converge in a nonlinear crystal, a dichroic mirror used for separating signal light and the idler frequency light, and a dichroic mirror used for separating the idler frequency light and the pumping light. The invention also provides the method of obtaining narrow linewidth intermediate infrared laser output without inserting a linewidth controller in the cavity of the OPO. The method is characterized by adjusting the pumping spot size of crystals to control the divergence angle thereof, applying proper pumping power to obtain narrow linewidth seed light output, selecting the proper pumping power and pumping spot size as well in an amplifying process, and reasonably distributing the pumping power between two stages to obtain high power narrow linewidth intermediate infrared output.

Description

technical field [0001] The invention relates to the technical field of solid-state lasers, in particular to a device and method for generating high-efficiency narrow-linewidth mid-infrared lasers. Background technique [0002] Optical Parametric Oscillation (OPO) and Optical Parametric Oscillation Amplification (OPA) are commonly used methods to generate high-power mid-infrared lasers. It is usually called signal light in OPO with shorter output wavelength, and idler light with longer wavelength. . [0003] Compared with birefringent phase matching technology, quasi-phase matching technology (QPM) has no limitation of wave vector direction and polarization direction. By properly selecting polarized beams, using the maximum nonlinear coefficient of crystals, and adopting non-critical phase matching methods, the gap between beams can be eliminated. Walk-off effect, and PPMg: OLN crystal has high effective nonlinear coefficient, high anti-damage threshold and wide tunable rang...

Claims

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Application Information

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IPC IPC(8): H01S3/102H01S3/108
Inventor 刘崇刘斌姜洪波项震
Owner ZHEJIANG UNIV
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