Self-stimulated Raman scattering laser of In-Band pump

Abstract

The invention discloses a self-stimulated Raman scattering laser of an In-Band pump, which comprises a laser pump source, a laser energy transfer optical fiber, a first planoconvex lens for collimation, a second planoconvex lens for focusing, a reflection mirror of a resonator cavity, a laser gain dielectric crystal, a laser output mirror and a laser collimating mirror which are sequentially arranged, wherein pump light outputted by the laser pump source is transmitted to the first planoconvex lens via the laser energy transfer optical fiber, collimated by the first planoconvex lens, focused by the second planoconvex lens and further focused on the end surface of the laser gain dielectric crystal, the laser gain dielectric crystal produces stimulated radiation after absorbing the pump light, when the radiation of fundamental frequency light in the resonator cavity exceeds the self-stimulated Raman scattering threshold of the laser gain dielectric crystal, the produced Raman laser is collimated and outputted by the laser collimating mirror. The self-stimulated Raman scattering laser can improve the self-stimulated Raman scattering conversion rate, eliminate the thermal relaxation process from the pump energy level to the laser energy level of electrons of the conventional pump way, improve the quantum efficiency, reduce the heat and increase the self-stimulated Raman scattering conversion rate.

Description

technical field [0001] The invention relates to a laser, in particular to an In-Band pumped self-excited Raman scattering laser. Background technique [0002] Stimulated Raman scattering is one of the important means of laser nonlinear frequency conversion. Many laser gain crystals have the characteristics of stimulated Raman scattering. Therefore, this crystal can be used not only as a laser gain medium but also as a Raman crystal. The two crystals can be combined into one, that is, the self-stimulated Raman scattering laser, which makes the whole laser system simple and compact. Based on the above advantages, the self-stimulated Raman scattering effect of the laser gain medium has gradually been used in recent years. People pay attention to it, but this simple structure also has its disadvantages. When the pump power is high, the temperature of the laser gain medium crystal will increase, and this temperature increase will seriously affect the efficiency of stimulated Rama...

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Problems solved by technology

[0002] Stimulated Raman scattering is one of the important means of laser nonlinear frequency conversion. Many laser gain crystals have the characteristics of stimulated Raman scattering. Therefore, this crystal can be used not only as a laser gain medium but also as a Raman crystal. The two crystals can be combined into one, that is, the self-stimulated Raman scattering laser, which makes the whole laser system simple and compact. Based on the above advantages, the self-stimulated Raman scattering effect of the laser gain medium has gradually been used in recent years. People pay attention to it, but this simple structure also has its disadvantages. When the pump power is high, the temperature of the laser gain medium crystal will increase, and this temperature increase will seriously affect the efficiency of stimulated Raman scattering. We It will be found that self-stimulated Raman scattering will have a decrease in slope efficiency or a decrease in power when the pump power is high. This phenomenon can be seen in many documents, such as: published in Opt.Lett (Optics Letters) in 2004 The article on "High-power diode-pumped actively Q-switchedNd:YVO 4 self-Raman laser:influence of dopant concentration" (the effect of crystal doping concentration on the output of high-power diode-pumped active Q-switched Nd:YVO4 self-Raman laser); the article "Continuous-wave" published on Opt.Lett in 2005 , all-solid-state interacavity Raman laser" (all-solid-state continuous wave intracavity self-Raman laser) and the article "Laser diodepumped actively Q-switched Nd:GdVO" published in Opt & Laser Technology (Optics and Laser Technology) in 2009 4 This phenomenon exists in self-Raman laser operating at 1173nm” (laser diode pumped active Q-switched Nd:GdVO4 self-Raman 1173nm laser), which is mainly due to the increase of the temperature of the laser crystal, which greatly reduces the efficiency of stimulated Raman scattering

In order to solve this problem, researchers have proposed many solutions, such as reducing the doping concentration of laser gain medium crystals and using conformal crystals as laser gain medium crystals, but these methods can only alleviate the problem and cannot fundamentally solve the problem. problem, so it is necessary to propose a method to fundamentally solve the problem

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