Chromium-doped potassium scandium tungstate tunable laser crystal

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...

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.