Chromium-doped potassium scandium tungstate tunable laser crystal

A laser crystal, chromium tungsten technology, applied in crystal growth, single crystal growth, single crystal growth and other directions, can solve the problems of affecting laser performance, short laser energy level life, small absorption coefficient, etc., to achieve stable growth process, excellent optical characteristics, the effect of good thermal conductivity

Inactive Publication Date: 2012-07-11
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The most studied near-infrared tunable laser crystal that has entered the application field is Ti 3+ :Al 2 o 3 (titanium-doped sapphire) and Cr 3+ :Li CaAlF 6 、Cr 3+ :LiSrAlF 6 , but they also have some unavoidable defects that limit their application range
[0004] Ti 3+ :Al 2 o 3 The main disadvantages of the crystal are: it cannot be directly pumped with a semiconductor laser, and in the crystal there is Ti 3+ -Ti 4+ Ion pairs make it absorb in the laser output band, which affects its laser performance, and because of its short laser upper energy level lifetime (3.2μs), it is necessary to use short pulse lasers, Q-switched lasers, continuous wave lasers or generate special Flashlamp pumping with short pulses, which limits its application
However, there are also problems such as poor thermal performance, small absorption coefficient, and low laser efficiency of LD pumping.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: with K 2 W 2 o 7 The growth doping concentration is 0.4at.%Cr for flux growth 3+ Cr 3+ :KSc(WO 4 ) 2 laser crystals.

[0027] The growth material is KSc (WO 4 ) 2 : K 2 W 2 o 7 =1:4 (molar ratio), doped with 1.0at% Cr 3+ion. Using the molten salt top seed crystal method, in a φ60×50mm platinum crucible, the growth temperature is between 950→820°C, with a cooling rate of 2°C / day and a crystal rotation speed of 15 rpm, a crystal with a size of 31 ×25×20mm 3 high quality Cr 3+ :KSc(WO 4 ) 2 crystals. The analysis by ICP (plasma emission spectrometry) shows that Cr in the crystal 3+ The ion content is 0.4 at%. .

Embodiment 2

[0028] Example 2: with K 2 W 2 o 7 The growth doping concentration is 0.82at.%Cr for flux growth 3+ Cr 3+ :KSc(WO 4 ) 2 laser crystals.

[0029] The growth material is KSc (WO 4 ) 2 : K 2 W 2 o 7 =1:3.5 (molar ratio), doped with 2.0at% Cr 3+ ion. Using the molten salt top seed method, in a φ60×50mm platinum crucible, the growth temperature is between 980→850°C, with a cooling rate of 3°C / day and a crystal rotation speed of 20 rpm, a crystal with a size of 35 ×30×26mm 3 high quality Cr 3+ :KSc(WO 4 ) 2 crystals. The analysis by ICP (plasma emission spectrometry) shows that Cr in the crystal 3+ The ion content is 0.82 at%.

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PUM

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Abstract

The invention provides a chromium-doped potassium scandium tungstate tunable laser crystal. 60-90at% of K2W2O7 serves as a fluxing agent, the cooling rate is 1-5DEG C/day, and the revolving speed is 5-30turns/minute. The Cr<3+>: KSc(WO4)3 crystal with high quality and bigger size grows. The crystal belongs to a trigonal system and has a space group structure. The crystal can serve as the tunable laser crystal of which the tunable range is 750-1200nm, and the solid crystal made of the crystal can be used for various fields, such as spectroscopy, biomedicine and military.

Description

technical field [0001] The invention relates to the technical field of optoelectronic functional materials, in particular to a laser crystal material used as a working substance in a tunable solid-state laser. Background technique [0002] Tunable laser technology is a very important branch in the laser field, which can realize continuous tuning output of laser in a certain wavelength range. Tunable laser technology is of great significance in science and technology and national defense construction. Tunable lasers are the main technical equipment for the research of various laser spectroscopy technologies, and also an important light source for the research of optics, optoelectronics, medicine, biology, etc. In the military, tunable lasers will be one of the important laser light sources for future optoelectronic countermeasures, such as lidar, laser communication, laser underwater detection and communication, laser remote sensing, laser blinding, etc. As one of the worki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C30B9/12H01S3/16
Inventor 王国建王国富林州斌张莉珍黄溢声
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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