Method and device for measuring intracavity loss of solid laser

Abstract

The invention discloses a method and device for measuring intracavity loss of a solid laser, and the method comprises the steps: firstly drawing an input-output power curve of the laser according to the injection pumping power of the laser and the corresponding laser output power, and then calculating the intracavity loss of the solid laser through the measured laser threshold value of the laser and the obtained input-output power curve. Reading a group of laser output power corresponding to the injection pumping power at a position higher than a laser threshold value, calculating to obtain the oblique efficiency of the laser, and then calculating to obtain the size of a resonant cavity mode waist spot at a laser crystal by utilizing an ABCD matrix at the injection pumping power; and finally, the oblique efficiency of the laser and the square value of the ratio of the resonant cavity mode waist spot at the laser crystal to the pumping laser waist spot are obtained through calculation, so that the intra-cavity loss value of the laser is obtained through quick and accurate calculation, and the method can be used for measuring the intra-cavity loss of the fundamental frequency light solid-state laser with single transverse mode, single longitudinal mode and multi-mode output.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a method and device for measuring the loss in a cavity of a solid-state laser. Background technique [0002] In the production, development and maintenance of solid-state lasers, the intracavity loss of the laser will limit the output power of the laser by affecting the laser gain. The intracavity loss is an important indicator parameter to measure the quality of the laser. It is used to guide the optimal design of the laser resonator, optimize the output performance and service life of the laser. [0003] Currently, Findlay-Clay analysis method, rate equation, method based on laser power and relaxation oscillation frequency are generally used to measure the loss in the laser wall, and the method of measuring the linear loss in the cavity of the all-solid-state intracavity frequency-doubling laser by using nonlinear loss. The Findlay-Clay analysis method needs to replace several ...

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Problems solved by technology

The Findlay-Clay analysis method needs to replace several sets of output coupling transmittance during operation. This operation will inevitably change the structure of the laser resonator and bring errors to the measurement results. At the same time, this method is powerless for the packaged laser; A variety of approximations are used in the process, which requires a comprehensive analysis of the energy level transition process of the low-gain laser medium. This method is difficult to apply to the measurement of the intracavity loss of high-gain lasers; based on the measurement of laser power and relaxation oscillation frequency The intracavity loss method must be applied in the stable operating state of the single longitudinal mode. Otherwise, when the laser has mode hopping, although the laser power does not change much, the relaxation oscillation frequency will change in a large range. As a result, large errors are caused, and it is impossible to measure the intracavity loss of single transverse-mode lasers with multiple oscillation frequencies and multi-mode operating lasers; the method of measuring the linear loss in the cavity of all-solid-state intracavity frequency-doubling lasers by using nonlinear loss, By measuring the fundamental wave and second harmonic output power corresponding to the two operating temperature points of the frequency-doubling crystal in the single-frequency region, and then substituting it into the linear loss expression of the laser cavity to calculate the linear loss value of the laser cavity, this method Intracavity loss cannot be performed for multimode operating lasers and lasers without intracavity frequency doubling process

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