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Tunable ultrashort pulse laser device with eye-safe wave band

An ultra-short pulse laser and eye-safe technology, which is applied in the field of physical lasers, can solve the problems of bulky lasers, high laser thresholds, and low optical damage thresholds, and achieve low laser ion concentration, simple system structure, and low laser thresholds. Effect

Inactive Publication Date: 2011-11-16
QINGDAO UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SESAM (semiconductor saturable absorber mirror) is currently the most successful saturable absorber for passive mode-locking. Due to the bottleneck problem of low optical damage threshold, its application in higher power lasers is limited; and from literature reports From the point of view, there is no mature use and development of SESAM for the 1.5-1.8 μm eye-safe band. High, high laser ion concentration, large heat load, complex device structure, difficult preparation process of saturable absorber, small application range and other outstanding shortcomings

Method used

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  • Tunable ultrashort pulse laser device with eye-safe wave band
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Embodiment 1

[0010] In this embodiment, a laser device with a repetition rate of 100 MHz, a pulse width of 20 ps, ​​and a wavelength of 1.50 to 1.57 μm is fabricated, and its cavity mirror 1 is a plano-concave mirror with a curvature radius of 800 mm and HR1.06 / 1.50 to 1.57 / 3.26 to 3.61 μm, the laser crystal 2 is a Nd:YAG module, the output wavelength of the diode laser 10 is 808nm, the cooling system 11 is the cooling water of the laser crystal and its control system, the cavity mirror 6 is a plano-concave mirror with a curvature radius of 600mm and HR1.06 / 1.50~1.57 / 3.26~3.61μm, adjust L1 to 1050mm, L2 to 450mm, nonlinear crystal 7 is a class II non-critical phase matching crystal KTP with a room temperature of 25°C, corresponding to 1.06μm→1.57μm+3.26μm to 1.06 μm→1.50μm+3.61μm multiple parameter processes, the trichroic cavity mirror 8 is a plane mirror and HR1.06μm / 3.26~3.61μm&T=3%1.57~1.50μm, the position and aperture of the diaphragm 4 are adjusted according to the specific experimen...

Embodiment 2

[0012] In this embodiment, a tunable laser device with a repetition rate of 160 MHz, a pulse width of 60 fs, and a wavelength of 1.60 to 1.70 μm is fabricated, and its laser crystal 2 is Ti:Al 2 o 3 The crystal is end-pumped, the wavelength of the pump light is 532nm, the cavity mirror 1 is a plane mirror with AR532nm&HR800~850nm / 1.60~1.70μm, the cavity mirror 6 is a plano-concave mirror with a curvature radius of 200mm and HR800~850nm&T=31.60-1.70μm , the nonlinear crystal 7 is a plurality of LBO crystals, corresponding to multiple parametric processes from 0.80 μm→1.60 μm+1.60 μm to 0.85 μm→1.70 μm+1.70 μm, and the trichroic cavity mirror 8 is a plane mirror with HR800~850nm&1.60~ 1.70μm, 1.60~1.70μm band ultrashort pulse laser is output by the cavity mirror 6, the length of L1 is 800mm, the length of L2 is 115mm, the position and aperture of the diaphragm 4 are adjusted according to the specific experimental conditions, the group velocity mismatch compensation device 3 and ...

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Abstract

The invention belongs to the technical field of physical laser and relates to a tunable ultrashort pulse laser device with an eye-safe wave band; two endoscopes are respectively arranged on the same plane; a laser crystal, a group-velocity mismatch compensation device, a diaphragm and a phase mismatch compensation device are respectively arranged at intervals on the connecting line between the centers of the two endoscopes; a non-linear crystal and a trichroic endoscope are respectively arranged in inclination at the lower side of the centre line of the endoscopes arranged in an inclination structure; a diode laser device and a cooling device are arranged on the side of the laser crystal; the diode laser device is controlled by a driving power supply system; the laser crystal is pumped bythe diode laser device to combine the non-linear crystal and the trichroic endoscope; the tunable ultrashort pulse laser generated by mode-locked laser oscillation is realized by using the positive and negative directions of a light wave through the cascading second-order nonlinear effect of the non-linear crystal. The tunable ultrashort pulse laser device with the eye-safe wave band has the advantages of simple structure, small volume, low cost, low laser threshold value, low laser ion concentration and good prospect of application.

Description

Technical field: [0001] The invention belongs to the technical field of physical lasers, and relates to an ultrashort pulse combined laser device with a wavelength of 1.5-1.8 μm, in particular to a tunable ultrashort pulse laser device in a human eye-safe band. Background technique: [0002] At present, the application of laser technology has made extensive progress, especially in people's daily life and physical health, laser technology and equipment have received great attention. The wavelength of laser light is mainly generated directly by laser crystals or by nonlinear optical frequency conversion. However, laser crystals that can radiate this wavelength range generally have high laser thresholds and high heat loads caused by high concentrations of activated ions in existing crystal types. These problems seriously limit the performance development and application of lasers. Since the mid-1980s, synchronously pumped picosecond and femtosecond optical parametric oscillato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/098H01S3/108
Inventor 潘淑娣万勇刘建华葛晓辉
Owner QINGDAO UNIV
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