A semiconductor pump laser

Abstract

The invention discloses a semiconductor pump laser, which includes a semiconductor laser pump source, an optical coupling system and a laser cavity. The laser cavity includes front and rear cavity plates, a laser gain medium, and optical elements other than the laser gain medium, wherein the laser gain The medium is composed of two or more laser gain media with different doping ion concentrations or different absorption coefficients. Different laser gain media are arranged in ascending order of doping ion concentration or absorption coefficient along the incident direction of pump light. The laser gain medium with low impurity ion concentration absorbs part of the pump light, and the other part of the pump light passes through the low-doped laser gain medium and is pumped and absorbed by the laser gain medium with high dopant ion concentration, reducing the The thermal lens effect of the laser gain medium can enhance the absorption of pump light at the same time, so as to obtain a semiconductor-pumped laser suitable for wide pump wavelength range and wide temperature operation.

Description

Technical field [0001] The invention relates to the field of lasers, in particular to a semiconductor pump laser composed of a laser gain medium with a doping concentration and other optical elements. Background technique [0002] Such as figure 1 The semiconductor pump laser shown includes a semiconductor laser pump source 1, an optical coupling system 2, and a laser cavity 3. The laser cavity 3 includes front and rear cavities 33, 36, a laser gain medium 34, and other optical elements 35. The absorption coefficient of the laser gain medium 34 varies with the concentration of doped ions. Generally, when the concentration range is not very large, the absorption half-width of the laser gain medium remains almost unchanged, and the absorption coefficient of the laser gain medium increases with the doping concentration. And improve. See you again figure 2 Shown are the absorption coefficient curves of the laser gain medium with different doping ion concentrations. Under the same l...

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Problems solved by technology

[0003] However, the higher the dopant ion concentration of the laser gain medium, the greater the absorption coefficient, and the shorter the focal length of the thermal lens, which is less suitable for pumping higher power pump lasers.

At the same time, the position of the pump point of the laser gain medium will change with the wavelength of the pump light. In actual use, the pump laser is not suitable for changing the pump point with the wavelength of the pump light, that is, only one pump point can be selected, so the pump When the wavelength is working in the effective absorption bandwidth range, the pump point is severely mismatched, cannot work well, or even completely mismatched; and the concentration of dopant ions should not be too high, otherwise the general laser gain medium has a fluorescence quenching effect

Neither such highly doped nor lowly doped laser gain media can work independently over a wide range of pump wavelengths

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