High-power single-longitudinal-mode holmium-doped solid laser device

Abstract

The invention discloses a high-power single-longitudinal-mode holmium-doped solid laser device. A first pumping source and a second pumping source are positioned on two transverse sides of Ho: YAG ceramic, a first reflecting body Bragg grating VBG1 is placed on the right side of a longitudinal output optical path of the YAG ceramic, laser reflected by the first reflecting body Bragg grating VBG1 enters a second reflecting body Bragg grating VBG2 by normal incidence, is subjected to normal reflection of the second reflecting body Bragg grating VBG2, and then is reflected back to the longitudinal output optical path of the Ho: YAG ceramic via the first reflecting body Bragg grating VBG1, reflectance spectra of the two VBG are overlapped, and an output coupling mirror is placed on the left side of the longitudinal output optical path of the Ho: YAG ceramic. The high-power single-longitudinal-mode holmium-doped solid laser device has the beneficial effects that the output laser has narrowline width, single-longitudinal-mode output is implemented, and high-power running can be realized.

Description

technical field [0001] The invention belongs to the technical field of lasers, and relates to a high-power single longitudinal mode Ho:YAG ceramic laser. Background technique [0002] The laser mode output by a single-mode laser is both a single longitudinal mode and a single transverse mode. Single longitudinal mode means that only a single longitudinal mode (single frequency) oscillates in the resonator. Single transverse mode is also called fundamental transverse mode, which means that the distribution of light intensity on the light cross section is Gaussian distribution. The advantage of single-mode lasers is that there is no mode competition, and the stability, coherence, and beam quality of the laser are very good. It has a wide range of applications in many fields such as interference rainbow holography, precision laser spectroscopy, laser radar, nonlinear frequency conversion, and laser medicine. [0003] There are many ways to generate a single longitudinal mode ...

AI Technical Summary

Problems solved by technology

Using a short cavity length to obtain single-mode output will limit the gain medium to a very small length, thereby limiting the output power of the laser; and if the cavity length is too short, it will easily lead to deterioration of the laser beam quality and poor stability

The use of dispersion cavity method, etalon method and optical filter method to generate single mode will make the structure of the laser complex, the loss is large, and the overall efficiency is not high

[0004] In order to suppress the generation of high-order modes and maintain a stable single longitudinal mode output, the output optical power of previous single longitudinal mode lasers is mostly maintained near the laser operating threshold; in order to obtain high-power single longitudinal mode lasers, most of them use optical amplification. way, increasing the complexity and cost of the system

If one wants to obtain high-power and stable single longitudinal mode laser output, the existing technology has been difficult to achieve or the manufacturing cost has increased sharply

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