Semiconductor laser pumped alkali metal laser system with V-type pump structure

Abstract

The invention discloses a semiconductor laser-pumped alkali metal laser system with a V-type pumping structure, which comprises a pumping light source, an alkali metal vapor cell, a temperature control system and a laser resonator output mirror. Pumping light is emitted from the pump light source, obliquely incident on the front surface of the alkali metal vapor cell with respect to the axial direction of the alkali metal vapor cell; The temperature control system is arranged close to the rear end face of the alkali metal vapor pool for stabilizing the temperature in the alkali metal vapor pool; The output mirrors of the laser resonator are arranged perpendicular to the axial direction of the alkali metal vapor cell. The output mirrors of the laser resonator and the back end face of the alkali metal vapor cell form the resonator of the laser. The laser is output from the output mirrors of the laser resonator to the outside of the resonator. The invention can realize the natural separation of the pump light and the laser light, avoids the intracavity transmission loss caused by the polarization device, no longer requires the polarization characteristic of the pump light, and can effectively improve the overall electro-optical efficiency of the DPAL system.

Description

Technical field [0001] The invention belongs to the field of semiconductor pumped alkali metal vapor lasers, and relates to a semiconductor laser pumped alkali metal laser system with a V-shaped pump structure. Background technique [0002] Diode Pumped Alkali Vapor Laser (DPAL) is a new type of high-efficiency laser that has developed rapidly in recent years. It has the advantages of both solid-state lasers and chemical lasers. It has the advantages of high quantum efficiency, excellent thermal management performance, and narrow line width. It is expected to achieve high-power and high-beam quality near-infrared laser output. It is used in laser interference, laser weapons, laser cooling, and orientation. Energy transmission, material processing and medical magnetic resonance imaging systems have broad application prospects. DPAL is a typical three-level laser whose main gain medium is potassium (K), rubidium (Rb) and cesium (Cs) vapor. These three gain medium atoms have simil...

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Problems solved by technology

However, the method of polarization splitting will bring two problems. On the one hand, the insertion of polarization components will inevitably increase the transmission loss of the resonator and affect the output efficiency of the laser; on the other hand, when using polarization splitting, the pump light is required It is linearly polarized light, and the conventional semiconductor pump light is not completely linearly polarized light, there will be a certain energy loss in the process of converting it into linearly polarized light, which will eventually affect the electro-optical efficiency of the DPAL system

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