Efficient wide-temperature semiconductor array pump intra-cavity frequency doubling solid laser

Abstract

The invention relates to a semiconductor array pump intra-cavity frequency doubling all-solid-state laser capable of being used at wide temperature. The efficient wide-temperature semiconductor array pump intra-cavity frequency doubling solid laser adopts a mode that an optical crystal beam splitting base frequency light and frequency doubling light wave plate having obvious dispersing effect on base frequency light and frequency doubling light is inserted into two same non-linear crystals or a mode that a frequency doubling light wave plate is added in laser crystals and non-linear crystals, changes a polarization state of frequency doubling light produced by returned base frequency light through the non-linear crystal and prevents the frequency doubling light reflected by the laser crystals from taking part in non-linear coupling wave conversion in the non-linear crystals. By adopting the method, the efficient wide-temperature semiconductor array pump intra-cavity frequency doubling solid laser can be achieved.

Description

technical field [0001] The invention relates to the design of a red, green and blue all-solid-state intracavity frequency-doubling laser that can be used at a wide temperature, and the invention belongs to the field of laser technology. technical background [0002] The structure of the general all-solid-state intracavity frequency-doubling red, blue, and green light devices is as follows: figure 1 , Figure 4 as shown, figure 1 It shows the separated basic structure of a general all-solid-state intracavity frequency-doubling laser, including: a semiconductor pump source 101, a coupling lens 102, a laser cavity rear cavity mirror 103, a laser crystal 104, a nonlinear crystal 105, and a laser output mirror 106. Coupling lens 102 is coated with pump light anti-reflection film on both sides, laser cavity rear cavity mirror 103 is coated with pump light anti-reflection film and base frequency light total reflection film, laser crystal 104 is coated with base frequency light an...

AI Technical Summary

Problems solved by technology

Since part of the frequency-doubled light travels back and forth to the nonlinear crystal, the temperature width of the nonlinear crystal of the same size is only 1 / 3 to 1 / 2 of that outside the cavity, and the temperature width of the same nonlinear crystal is inversely proportional to the length of the light-passing direction. And because the harmonic conversion efficiency is proportional to the length, this makes the laser can only be used normally within a small temperature range without temperature control, or increases the temperature control requirements when adding temperature control, which greatly Limits the application range and working stability of the laser

For the pumping structure of a single semiconductor source, the planes of the laser crystal and the nonlinear crystal in the direction of light transmission are cut into squares. Since the semiconductor cooling chip is generally a thin sheet structure, when the designed laser needs cooling by the semiconductor cooling chip, this increases the The difficulty of assembling the laser

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