Transverse plane pump laser capable of high efficiently using pump light

Abstract

A transverse plane pump laser comprises: a pump laser, coupling lenses and laser crystals. The pump laser outputs linearly polarized light. The coupling lenses are used for coupling the output light of the pump laser into the laser crystals. The pump laser is characterized in that: a polarization beam splitter and a 1 / 4 wave plate are arranged between the pump laser and the laser crystals; the 1 / 4 wave plate is a quarter of the wave plate of pump light and the 1 / 4 wave plate is closer to the laser crystals than the polarization beam splitter; one end side of the laser crystals is provided with a pump light reflection component, wherein the end side is opposite to an incident end of the pump light; the linearly polarized light emitted by the pump laser can transmit the polarization beam splitter and the linearly polarized light can be reflected along the original direction after the polarization direction is rotated 90 DEG C.

Description

technical field [0001] The invention relates to a laser, mainly a solid-state laser, and belongs to the technical field of optoelectronics. Background technique [0002] Gas or solid-state lasers are currently very commonly used lasers. Most of the solid-state lasers currently used are pumped by LD. The pump light enters the resonant cavity with the laser gain medium from the end face or side to pump the laser gain medium. , so as to generate laser light, the generated laser light may be the fundamental frequency light, but this fundamental frequency light is not what we need. At this time, it may be necessary to add a frequency doubling crystal inside or outside the resonator to realize the doubling of the fundamental frequency light. Frequency, so as to get the laser we need. The end pump in the prior art is as attached figure 1 As shown, it includes a pump source 1.1, a coupling lens 1.2 and a laser crystal 1.3. The pump source 1.1 and the coupling lens 1.2 are both lo...

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Problems solved by technology

But in any case, if a high-reflection film for pump light is installed at the exit end of the laser crystal, there will be a problem, that is, the pump light may not be completely absorbed by the laser crystal after being reflected back to the laser crystal. This causes a part of the pump light to be reflected back to the pump laser source, which creates two problems. One problem is that the reflection of the pump light back to the pump source may damage or affect the pump source, and the other is that the pump light leaks out. The laser crystal is wasted, but if the pump light high reflection film is not installed at the exit end of the laser crystal, a significant loss of pump light will occur. This contradiction is a problem that needs to be solved at present.

[0003] In the prior art, in order to make full use of the pump light and not reflect the pump light back to the pump source, a side pumping technology is designed, that is, the pump light is obliquely injected into the pump with an incident window on the side. Although this pumping technology solves the above-mentioned problems to a certain extent, the structure of this technology is complicated, and the side pumping technology is used. In actual situations, due to the limitations of conditions or assembly, we Possibly only end-pumped

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