An Orthogonal Polarization Dual-Wavelength Laser with Adjustable Power Ratio

Abstract

The invention discloses an orthogonally polarized dual-wavelength laser with adjustable power ratio. The linearly polarized fundamental-frequency laser is focused into a Raman crystal through a coupling focusing system to provide Raman gain. When the Raman gain is greater than the Stokes optical resonance When the cavity is lost, Stokes light is formed to oscillate and output in the cavity. The Raman crystals used have different frequency shifts of the main Raman peaks in different polarization directions. When the polarization direction of the fundamental frequency light is not parallel to the crystal axis, an orthogonally polarized dual-wavelength laser output is obtained, and the incident linearly polarized fundamental frequency is controlled by a half-wave plate. The polarization direction of the laser can change the ratio of the two polarization components of the fundamental frequency light along the crystal axis direction, and realize the simple adjustment of the output power ratio of the orthogonal polarization dual wavelengths.

Description

technical field [0001] The invention relates to the field of lasers, in particular to an orthogonally polarized dual-wavelength laser with adjustable power ratio. Background technique [0002] Dual-wavelength lasers with similar wavelengths and orthogonal polarization directions have important applications in nonlinear optical frequency conversion, laser radar and other fields. Most of the current orthogonally polarized dual-wavelength lasers use two laser crystals of the same type or a combination of two laser crystals with different emission peak wavelengths in the two polarization directions, such as Nd:YLF (neodymium-doped yttrium lithium fluoride) [1] or Nd:YAP (Nd-doped yttrium aluminate) [2] etc. Under the action of the pump light, the gains of different laser wavelengths on two orthogonal polarizations are respectively provided, and the two wavelengths are combined / splittered through polarization devices such as a polarization beam splitter prism or a polarization b...

AI Technical Summary

Problems solved by technology

[0009] The present invention provides an orthogonally polarized dual-wavelength laser with adjustable power ratio. The present invention utilizes potassium gadolinium tungstate (KGW) crystals with different Raman main peak frequency shifts in different polarization directions to realize orthogonally polarized dual-wavelength lasers with similar wavelengths. Laser output, and the power ratio of the dual-wavelength laser can be adjusted conveniently, which overcomes the shortcomings of the existing dual-wavelength laser system in terms of complexity, high risk of damage, and difficulty in time synchronization. See the following description for details:

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