Composite wave plate method based sum frequency laser

Abstract

A composite wave plate method based sum frequency laser comprises a semi-conductor laser body, a coupling lens, a laser gain medium and an output mirror, wherein the semi-conductor laser body emits ump light, the pump light enters the laser gain medium through the coupling lens, the laser gain medium forms spontaneous radiation, the left end face of the laser gain medium and the output mirror are respectively plated with a double-spectral-line total reflection film, a resonant cavity of the laser is formed between the laser gain medium and the output mirror, a composite wave plate is arranged in the resonant cavity and is composed of a full-wave plate which enables spectrum line to have a weak gain and a quarter wave plate which enables a spectrum line to have a strong gain, radiation strength of different laser spectrum lines can be adjusted through the composite wave plate, dual-wavelength simultaneous oscillation starting is achieved, and then intracavity sum frequency is carried out through a nonlinear crystal. The composite wave plate method based sum frequency laser has the advantages of being high in light-light conversion efficiency, compact in structure, stable in performance, low in cost and the like and has wide practicability.

Description

technical field [0001] The invention relates to the technical field of solid-state lasers, specifically a composite wave plate and frequency method that improves the light-to-light conversion efficiency of a sum-frequency laser, and has the advantages of compact structure, stable performance, low cost, and wide application. Chip method and frequency laser. Background technique [0002] At present, solid-state sum-frequency lasers are mainly realized in two ways: the sum-frequency method of strong spectral lines and weak spectral lines is mainly used to obtain yellow laser light in two ways, one is to use a single gain medium to oscillate at two wavelengths at the same time, and then use Nonlinear crystals perform sum-frequency, such as the article "Diode-pumped 593.5nmcw yellow laser by type-I CPM LBO intracavity sum-frequency-mixing" published in "Optics&Laser technology" in 2006, which uses this technology, another Two gain media and two pump sources are used to form two ...

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Problems solved by technology

[0002] At present, solid-state sum-frequency lasers are mainly realized in two ways: the sum-frequency method of strong spectral lines and weak spectral lines is mainly used to obtain yellow laser light in two ways, one is to use a single gain medium to oscillate at two wavelengths at the same time, and then use Nonlinear crystals perform sum-frequency, such as the article "Diode-pumped 593.5nmcw yellow laser by type-I CPM LBO intracavity sum-frequency-mixing" published in "Optics&Laser technology" in 2006, which uses this technology, another Two gain media and two pump sources are used to form two resonant devices with overlapping regions, and then nonlinear crystals are placed in the overlapping regions to perform sum frequency to obtain yellow laser output. For example, it was published in the Acta Physica "The V-cavity intracavity and frequency generation 3W continuous wave 589nm yellow light laser" on the "V-shaped cavity" is this method, but the above two methods have certain disadvantages. The first method needs to achieve dual wavelengths in the same resonant cavity. Simultaneous oscillation requires proper loss of the spectral line with strong gain. The usual method is to coat the output mirror with a film system with a certain transmittance for the spectral line with strong gain, and to coat the weak gain spectral line with a total reflection film. , so that the ratio of the number of photons in the cavity of the two spectral lines reaches 1:1 through the loss of the strong gain spectral line, but the efficiency of this method is relatively low, such as pumping Nd:YVO with a pump power of 25W 4 The crystal can obtain about 800mW of yellow light, but the output of the 1064nm laser is as high as about 2.5W. This part of energy is wasted without participating in the sum frequency, which affects the sum frequency efficiency. The second method requires two sets of pump sources. The structure of the resonant cavity is also relatively complicated, the optical path is difficult to adjust, and the stability is poor, which is not conducive to productization and practical application

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