High-power dual-wavelength human eye safe wave band Raman laser

Abstract

The invention discloses a high-power dual-wavelength human eye safe wave band Raman laser which comprises a laser diode pumping source, a focusing coupling system, an input cavity mirror of a Raman resonant cavity, a laser gain medium, an acousto-optic Q switch, a Raman gain crystal and an output cavity mirror of the Raman resonant cavity. And the Raman gain crystal is a SrWo4 crystal. Pumping laser of the laser diode pumping source is collimated and focused by the focusing coupling system and then enters the laser gain medium through a rear cavity mirror of the Raman resonant cavity, the laser gain medium generates stimulated radiation, and 1319nm and 1338nm fundamental frequency laser oscillation is formed in the Raman resonant cavity. When the power of fundamental frequency laser in the cavity reaches the threshold power of stimulated Raman scattering, the laser generates stimulated Raman scattering when propagating in the Raman gain crystal, first-order Stokes light of 1501nm and 1526nm is formed, and then the first-order Stokes light of dual wavelength is output through a front cavity mirror of the Raman resonant cavity. Compared with the existing 1.5 mu m human eye safe Raman laser, the laser provided by the invention realizes higher output power, and has the advantages of compact structure, high conversion efficiency and stable dual-wavelength Raman laser output.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a high-power eye-safe band Raman laser. Background technique [0002] Solid-state lasers with output laser wavelengths in the eye-safe area of ​​1.5 μm have attracted much attention due to their potential for wide-ranging applications in medical and lidar. In the past, to generate eye-safe 1.5 μm laser light sources, optical parametric oscillators, Cr-doped 4+ , Er 3+ and Yb 3+ Lasers and pathways for stimulated Raman scattering. Stimulated Raman scattering is known to be an efficient technique for generating new wavelengths based on conventionally achievable laser waves. Previously, Nd:SrWO-based 4 , Nd:YVO 4 , Nd:GdVO 4 , Nd:KGd(WO 4 ) 2 The self-Raman laser that works in the 1.5μm eye-safe area, but the optical conversion efficiency is low and the output power is low. Despite the complex physical process of Raman lasers, the phenomenon of spectral broadening of fundam...

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Problems solved by technology

Based on the theory of Bonner et al., when the Raman linewidth of the Raman crystal is much smaller than the laser gain bandwidt

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