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Method for optimizing quasi-three-energy-level solid-state laser conversion efficiency

A solid-state laser and quasi-three-level technology, applied in the field of lasers, can solve the problems of crystal concentration-length product sensitivity, etc., and achieve the effects of improving conversion efficiency, optimizing conversion efficiency, and flexible structure design

Active Publication Date: 2018-09-25
中科纳迪(苏州)科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a method for optimizing the conversion efficiency of quasi-three-level solid-state lasers. The invention solves the problem that the conversion efficiency of existing quasi-three-level solid-state lasers is sensitive to the crystal concentration-length product, and realizes the optimization of laser efficiency. For details, see Described below:

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  • Method for optimizing quasi-three-energy-level solid-state laser conversion efficiency

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Embodiment 1

[0032] In order to solve the problem that the conversion efficiency of existing quasi-three-level lasers is restricted by pump absorption and reabsorption loss, and is sensitive to the concentration length of the laser gain medium, an embodiment of the present invention provides an optimized quasi-three-level solid For methods of laser conversion efficiency, see figure 1 , the quasi-three-level solid-state laser: laser diode pumping source 1, energy transmission fiber 2, coupling lens group 3, laser total reflection mirror 4, laser gain medium 5 and laser output mirror 7;

[0033] Among them, the laser total reflection mirror 4 is coated with pump light antireflection and laser high reflection coating, the laser gain medium 5 is coated with pump light and laser antireflection coating, and the laser output mirror 7 is coated with laser wavelength partial transmission film;

[0034] The laser diode pumping source 1 emits pump light in the absorption band of the gain medium 5, an...

Embodiment 2

[0038] The embodiment of the present invention further introduces the structure of the laser gain medium 5, see figure 1 , see the description below:

[0039] The embodiment of the present invention includes: a laser diode pumping source 1 , an energy transmission fiber 2 , a coupling lens group 3 , a laser total reflection mirror 4 , a laser gain medium 5 , a modulation device 6 and a laser output mirror 7 .

[0040] Wherein, the laser gain medium 5 is made of Nd:YAG crystal with a doping concentration of 0.8-at.%. Crystal cross section size 4×4mm 2 , the rear end face is cut by Brewster's angle, the top of the crystal is 4mm long in the y direction, and the bottom is 6.2mm long in the y direction. The end is not coated; the laser total reflection mirror 4 is a flat mirror, coated with 946nm high reflection, 808nm pump light and 1.06μm, 1.3μm anti-reflection coating system; the laser output mirror 7 is a flat mirror, coated with 946nm transmittance T = 5% , 1.06 μm, 1.3 μm...

Embodiment 3

[0045] The embodiment of the present invention further introduces the structure of the laser gain medium 5, see figure 2 , see the description below:

[0046] A method for optimizing the conversion efficiency of a quasi-three-level solid-state laser, the quasi-three-level solid-state laser comprising: a laser diode pump source 1, an energy transmission fiber 2, a coupling lens group 3, a laser total reflection mirror 4, and a laser gain medium 5 , modulation device 6 and laser output mirror 7.

[0047] Among them, the laser gain medium 5 selects a-cut Nd:YVO 4 Crystal, undoped part 5-1 by laser gain medium, namely pure YVO 4 Crystal, and laser gain medium doping part 5-2, namely Nd:YVO 4 The crystal is bonded in two parts.

[0048] Whole Nd:YVO 4 The cross-sectional size of the crystal is 4×4mm 2 , the undoped part 5-1 is pure YVO 4 The top of the crystal in the y direction is 2mm long, and the bottom in the y direction is 4mm long; the laser gain medium doping part 5-...

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Abstract

The invention discloses a method for optimizing quasi-three-energy-level solid-state laser conversion efficiency. A laser diode pump source emits pump light in an absorption band in a gain medium. Thepump light is focused in the gain medium through an energy transmitting fiber and a coupling lens group. The gain medium absorbs the pump light and forms population inversion. Quasi-three-energy-level laser oscillation is formed under the positive feedback effect of a laser resonant cavity formed by a laser full reflection mirror and a laser output mirror and is output via the laser output mirror. The light beam propagation direction of the laser gain medium is an x direction, and the two directions of a cross section are y and z directions. The projection of the doped portion of the laser gain medium in an xy plane is in a wedge shape. The laser gain medium is moved at the y direction so that the length of the doped portion which an optical path passes through at the x direction is changed. A concentration length product is optimized so as to achieve optimal conversion efficiency. Through a theoretical calculation result, the conversion efficiency of the existing quasi-three-energy-level solid-state laser is greatly increased in the invention.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a method for optimizing the conversion efficiency of a quasi-three-level solid-state laser. Background technique [0002] Quasi-three-level laser system (the lower energy level of the laser is the Stark level of the ground state, such as yttrium-doped (Nd) laser gain medium 4 f 3 / 2 → 4 I 9 / 2 Transition-generated 0.9μm radiation and Yb-doped laser gain medium 2 f 5 / 2 → 2 f 7 / 2 1μm radiation, etc.) is a common operating mechanism of solid-state lasers, which has a very wide and important application. [0003] Since the lower energy level of the quasi-three-level laser system is the Stark level of the ground state, and the particle distribution is more, it will cause a large reabsorption loss to the laser oscillating in the cavity, so it is often necessary to choose a lower doping concentration and The direct impact of low doping concentration and short crystal length is that the cryst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/105H01S3/16
CPCH01S3/105H01S3/1643
Inventor 苏鑫崔新
Owner 中科纳迪(苏州)科技有限公司
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