Power stable solid laser and control method

Abstract

The invention discloses a power stable solid laser and a control method thereof. The power stable solid laser comprises a base inside which cooling water flows, a heat-conducting carrier for mountingand fixing an optical crystal of the solid laser, a temperature sensor disposed on the heat-conducting carrier, a semiconductor refrigeration unit disposed between the heat-conducting carrier and thebase and driven by a bipolar current driver, and a control unit. A temperature-current double closed-loop control system is realized on the basis of the conventional temperature control system; an inner loop is a closed current loop controlled by PI, and an outer loop is a closed temperature loop controlled by PID, so as to improve the control precision of the system, and finally achieve the purpose of improving the power stability of the solid laser.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a power-stabilized solid-state laser and a control method. Background technique [0002] Solid-state lasers have the advantages of short wavelength, high absorption rate, small volume, and flexible processing through optical fiber transmission, making them more and more widely used in laser processing. Domestic research on solid-state lasers is mainly focused on increasing power, and the stability of solid-state laser power is also a major factor limiting its popularization and use, and is an important indicator of solid-state laser performance. The working substance in the solid-state laser, that is, the optical crystal, is prone to heat deposition during operation, which causes its own temperature change, which in turn causes the spectrum and power of the laser output laser to drift, seriously affecting the power stability of the laser. Therefore, many domestic soli...

AI Technical Summary

Problems solved by technology

However, most of the water-cooled temperature control systems used in China have the disadvantages of relatively low precision on the one hand, and a certain hysteresis on the other hand, which often cannot cool down the solid-state laser in time when the temperature rises.

However, because the TEC will generate a temperature difference ΔT during the working process, thereby generating a thermoelectromotive force, the existence of this electromotive force will affect the effective working voltage loaded on both ends of the TEC in actual work, thereby affecting its actual working current, resulting in low final temperature control accuracy.

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