Semiconductor end-pumped high-power single-mode air cooling laser

Abstract

The invention discloses a semiconductor end-pumped high-power single-mode air cooling laser. A first pump source LD and a first coupled focusing system as well as a second pump source LD and a second coupled focusing system are connected by optical fibers; lasers output by the first coupled focusing system and the second coupled focusing system respectively enter into a gain medium; a first catadioptric lens and a second catadioptric lens are respectively arranged between the first coupled focusing system and the gain medium as well as between the second coupled focusing system and the gain medium; a reflection light path of the first catadioptric lens is provided with a thermal lens compensation totally reflecting mirror; a reflection light path of the second catadioptric lens is provided with a Q-switch and a totally reflecting mirror; and a first temperature control device and a second temperature control device are arranged at the outer side of the gain medium and respectively used for controlling the temperatures of all surfaces which are vertical to an a-axis of the gain medium as well as all surfaces which are vertical to a c-axis of the gain medium. The laser of the invention has high power, high efficiency and excellent quality of effluent light beams.

Description

technical field [0001] The invention relates to a laser, in particular to a semiconductor end-pumped high-power single-mode air-cooled laser. Background technique [0002] End-pumped solid-state lasers pumped by laser diodes are popular for their compact devices, good beam quality, and high efficiency. However, it is very difficult to realize high-power fundamental-mode end-pumped solid-state lasers. There are no reports of end-pumped laser products with a power exceeding 30W in China, and only a few laser companies such as Spectrophysics can do it in the world. [0003] Among the many laser crystals suitable for laser diode pumping, Nd:YVO 4 Crystals are favored by people because of their large stimulated emission cross-section, wide absorption spectrum, and polarization output (see "LD-pumped high-efficiency Nd:YVO for femtosecond ultraviolet laser generation) 4 Green Laser Research", Acta Photonica Sinica, 2000, 29(11): 1053-1055 pages). However, Nd:YVO 4 The thermal c...

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Problems solved by technology

[0005] To overcome the longitudinal thermal effect, the axial asymmetric heat dissipation method is adopted, that is, the cooling is perpendicular to the Nd:YVO 4 The two faces of the "c" axis of the crystal, while the two faces of the "a" axis are not cooled (see US patent US 5410559, the invention name "Diodepumped laser with strong thermal lens crystal"), which can be obtained when pumping at low power Circular spot output, but if a high-power laser diode is selected as Nd:YVO 4 When the pump source, because Nd:YVO 4 A large amount of heat on the crystal cannot be dissipated in time, so that the output laser spot is elliptical, and in severe cases, the crystal will be damaged

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