A mid-infrared laser with pulse output based on ring cavity mixed-end pump

Abstract

The present invention relates to the field of mid-infrared lasers, in particular to a mid-infrared laser based on a ring cavity mixed-end pump pulse output, including a plurality of pumping devices, two adjacent pumping devices are placed according to a preset angle, and the pumping device includes a semiconductor laser and coupling lens groups, a compound crystal is placed on one side of each coupling lens group, a dichroic mirror is placed between the coupling lens group and the compound crystal, and a plurality of dichroic mirrors form a ring resonant cavity; the acousto-optic Q-switching switch is located at The composite crystal and the dichromatic mirror are placed along the propagation direction of the oscillating light beam in the ring resonant cavity; the total reflection mirror is located on the light path reflected by the dichromatic mirror. The present invention proposes a mid-infrared laser based on a ring-cavity mixed-end pump pulse output, which solves the problem that the existing mid-infrared laser is difficult to obtain high repetition frequency, narrow pulse width, high power and high beam quality pulse laser.

Description

technical field [0001] The invention relates to the field of mid-infrared lasers, in particular to a mid-infrared laser based on a ring cavity mixed end-pump pulse output. Background technique [0002] The mid-infrared laser in the 2.7-3.0μm band is at the absorption peak of water and can excite the high-speed kinetic energy of water molecules. The important application in ophthalmology, dentistry, orthopedics and other fields is as a scalpel. In order to reduce the damage of laser to surrounding soft tissue, laser The pulse width should be as smaller as possible than the thermal relaxation time of the soft tissue. In addition, the mid-infrared laser in the 2.7-3.0μm band is a high-quality pump source for pumping nonlinear crystals to generate 8-13μm mid- and long-infrared lasers. Laser pulses with high repetition frequency and high peak power can improve the conversion efficiency. [0003] The problems with existing lasers are: [0004] (1) It is difficult to obtain mid-i...

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Problems solved by technology

[0004] (1) Electro-optic, acousto-optic, saturable absorption, mechanical and other Q-switches are difficult to simultaneously obtain high repetition frequency, high peak power, and narrow pulse width mid-infrared pulsed laser in the 2.7-3.0μm band

[0005] (2) It is difficult to ensure high output power and high beam quality at the same time

Using flash lamp and semiconductor laser side pumping, although the obtained laser output power is high, but the matching of the side pumping mode is relatively poor, it is difficult to obtain high beam quality laser output

Using a semiconductor laser to pump one end of an Er:YSGG crystal, the mode of the generated oscillating light matches the pumping light mode well, so that the quality of the generated laser pulse beam is high, but the injection energy of the pumping light is limited, thus resulting in lower output laser power

[0006] (3) Solve the problem of side-pumping Er:Cr:YSGG crystals with flash lamps in the prior art to generate more harmful heat; solve the problems that Er:YSGG crystals have low absorption coefficient for 970nm semiconductor laser and low light-to-light conversion efficiency

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