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A Two-step Method for Exciting CW Green Laser

A laser, green light technology, applied in the field of lasers, can solve the problems of unstable laser output, can not be truly continuously tunable, can not meet the requirements of use, etc., and achieve the effect of shortening the length of the resonant cavity, reducing the loss, and improving the conversion efficiency.

Active Publication Date: 2018-04-17
HEILONGJIANG INST OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a two-step method for exciting a continuous wave green laser, aiming to solve the problem that the existing diode laser output laser beam quality is poor and cannot meet the use requirements of a higher medical level; dyeing, laser output laser is unstable , the problem of not being truly continuously tunable

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  • A Two-step Method for Exciting CW Green Laser

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Embodiment Construction

[0016] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0017] The present invention uses two-step excitation to realize the continuous wave green laser. The crystals include Er-doped oxide crystals and Er-doped fluoride crystals. The output laser beam quality is high, and the beam quality output by the laser is M 2 Factor <1.1 close to 1, the continuous output efficiency of the laser is about 10%, which is relatively high, the laser is tunable, and the stability of the output laser is good; the two-step excitation continuous wave green laser is an all-solid-state laser, and the output beam quality factor M2 is about Equal to 1, the wavelength can be tuned.

[0018] The applica...

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Abstract

The invention discloses a method for two-step excitation of a continuous-wave green laser. Parallel light passes through a focusing lens and then is focused to the center of the end surface of Er:YAlO3 crystal at one side, close to the focusing lens, of the Er:YAlO3 crystal; Er<3+> in the Er:YAlO3 crystal absorbs pump light and the Er<3+> in a ground state <4>I15 / 2 energy level in the Er:YAlO3 crystal is excited to reach a <4>I11 / 2 energy level; the Er<3+> in the <4>I11 / 2 energy level absorbs the pump light and transits into a <4>F7 / 2 energy level; and population inversion is achieved through certain accumulation of the Er<3+> in the <4>F7 / 2 energy level along with an increase of the Er<3+> in the <4>F7 / 2 energy level. The output laser light beam is high in quality, the output efficiency of the laser is relatively high, the stability of output laser light is good, the quality factor M2 of an output light beam is approximately equal to 1, and the wavelength can be tuned.

Description

technical field [0001] The invention belongs to the technical field of lasers, in particular to a two-step method for exciting a continuous wave green laser. Background technique [0002] Visible light band lasers are widely used in industry, agriculture, information industry, military, medicine and other fields. Especially in the field of medicine, the application of continuous lasers with specific wavelengths in the visible light band has greatly promoted the development of medicine. Among them, the most sensitive 550nm tunable continuous laser of the human eye has been used in the treatment of closed membrane glaucoma, secondary glaucoma and congenital glaucoma. Eye diseases such as pupil residual membrane. [0003] Existing diode laser (LD): This laser can directly realize continuous laser output in the visible light band, but the quality of the output laser beam is poor, and cannot meet the use requirements of a higher medical level; Dye laser: It can realize continuou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/091H01S3/16
Inventor 李林军杨曦凝白云峰楚琳琳贺泽龙
Owner HEILONGJIANG INST OF TECH