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A method to optimize the conversion efficiency of quasi-three-level solid-state lasers

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

Active Publication Date: 2019-12-13
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:

Method used

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  • A method to optimize the conversion efficiency of quasi-three-level solid-state lasers
  • A method to optimize the conversion efficiency of quasi-three-level solid-state lasers

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Embodiment 1

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

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

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

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 for details:

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

[0040] Among them, the laser gain medium 5 uses Nd:YAG crystal with a doping concentration of 0.8-at.%. Crystal cross section size 4×4mm 2 , The back end is cut with Brewster angle, the top of the crystal is 4mm long in the y direction, and the bottom end in the y direction is 6.2mm long. The incident end of the crystal is coated with pump wavelength 808nm, laser wavelength 946nm and 1.06μm, 1.3μm anti-reflection coatings. The end is not coated; the laser total mirror 4 is a flat mirror, coated with 946nm high reflection, 808nm pump light, and 1.06μm, 1.3μm anti-reflection coating s...

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 for details:

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

[0047] Among them, the laser gain medium 5 uses a-cut Nd:YVO 4 Crystal, made of laser gain medium without doped part 5-1, namely pure YVO 4 Crystal and laser gain medium doped part 5-2, namely Nd:YVO 4 The two parts of the crystal are bonded together.

[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 end of the crystal is 2mm long in the y direction, and the bottom end is 4mm long in the y direction; the laser gain medium ...

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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, and 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 energy level of the ground state, such as yttrium (Nd) doped laser gain medium 4 F 3 / 2 → 4 I 9 / 2 0.9μm radiation and ytterbium (Yb) doped laser gain medium generated by the transition 2 F 5 / 2 → 2 F 7 / 2 1μm radiation, etc.) is a common operation mechanism of solid-state lasers, and has a very wide range of important applications. [0003] Since the lower energy level of the quasi-three-level laser system is the Stark energy level of the ground state, the particles are distributed more, which will cause greater reabsorption loss for the laser oscillating in the cavity, and it is often necessary to choose a lower doping concentration and The crystal length, and the direct impact of low doping conc...

Claims

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Application Information

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Patent Type & Authority Patents(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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