1.6-1.7 micron band laser based on cascaded frequency conversion

A laser and waveband technology, applied in the field of laser and nonlinear optics, can solve the problems of critical phase matching walk-off effect, OPO angular bandwidth, spectral bandwidth temperature bandwidth and effective nonlinear coefficient limitation, etc., to achieve compact structure and effective nonlinearity. Large coefficient, the effect of improving conversion efficiency

CN110165534BActive Publication Date: 2021-08-17XUZHOU NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-08-17

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Abstract

The invention discloses a 1.6-1.7 micron band laser based on cascaded frequency conversion, which belongs to the technical field of laser and nonlinear optics, and includes a resonator input mirror and a resonator output mirror, and the resonator input mirror and the resonator output mirror form a 1064nm Laser resonant cavity; a resonant cavity intermediate mirror is placed in the 1064nm laser resonant cavity, and the resonant cavity intermediate mirror and the resonant cavity output mirror form a nonlinear optical frequency conversion resonant cavity, between the resonant cavity input mirror and the resonant cavity intermediate mirror Place the 1064nm laser medium and Q switch in sequence, and place the first X-axis cut MTiOXO between the resonator intermediate mirror and the resonator output mirror. 4 Crystal with X-axis cutting of the second MTiOXO 4 crystals. The invention adopts the intracavity nonlinear optical frequency conversion method, fully utilizes the characteristics of high power density and good beam quality of the intracavity laser, and can improve the conversion efficiency of the nonlinear optical frequency conversion.
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Description

technical field

[0001] The invention belongs to the technical field of laser and nonlinear optics, and in particular relates to a 1.6-1.7 micron band laser based on cascade frequency conversion. Background technique

[0002] The 1.6-1.7μm band light source has become a hotspot of research and application at home and abroad because of its special spectral properties. This band is in the weak absorption region of water, so the incident energy loss of the light source in this band to biological tissues containing a large number of water molecules is low, and at the same time, this band is in the absorption peak of fat and collagen, so the light source in this band will be used in optical coherence tomography Imaging, multiphoton fluorescence microscopy, laser surgery and other fields have been widely used.

[0003] The 1.6-1.7μm band also covers the absorption peak of the C-H covalent bond, so the light source in this band will be widely used in the welding of polyethylene, po...

Examples

Embodiment Construction

[0020] Below in conjunction with example and accompanying drawing, the present invention will be further described.

[0021] Such as figure 1 As shown, the laser in the 1.6-1.7 micron band based on cascaded frequency conversion includes a resonator input mirror 1, a laser medium pump source 2, a 1064nm laser medium 3, a Q switch 4, a resonator intermediate mirror 5, and the first X-axis cutting MTiOXO 4 Crystal 6, X-axis cut second MTiOXO 4 Crystal 7 and resonator output mirror 8; resonator input mirror 1 and resonator output mirror 8 form a 1064nm laser resonator, and a resonator intermediate mirror 5 is placed in the 1064nm laser resonator, and the intermediate mirror 5 and resonator output mirror 8 form a nonlinear Optical frequency conversion resonator, 1064nm laser medium 3 and Q switch 4 are placed in sequence between the resonator input mirror 1 and resonator intermediate mirror 5, laser medium pump source 2 pumps 1064nm laser medium 3, resonator intermediate mirror 5...