Tunable laser crystal chrome-doped sodium magnesium molybdate and preparation method thereof

Abstract

The invention provides tunable laser crystal chrome-doped sodium magnesium molybdate and a preparation method thereof. A molten salt top seed crystal method is adopted, 55-80at.% of Na2Mo2O7 is used as a melting assistant, and the growth parameters are as follows: the cooling velocity is 0.5-3 DEG C/day, the growth temperature is 800-880 DEG C, the rotation speed is 5-30rpm/minute, and a Cr<3+>:Na2Mg5(MoO4)6 crystal which is relatively good in quality and relatively large in size is grown, wherein the doping concentration of Cr<3+> is 0.2-5at.%. The crystal belongs to a triclinic system, and has a P-1 space group structure as shown in the specification. The crystal has the characteristics that the mechanical property is moderate, the tunable laser wave band is wide, the emission cross section is large, and the like, and is a relatively good tunable laser crystal material.

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 refers to the laser whose laser wavelength can be continuously changed within a certain wavelength range (that is, within a wide spectral interval). 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. [0003] Si...

AI Technical Summary

Problems solved by technology

[0003] Since 1963, L.F.Johnson et al. have used flash lamp pumping, in doped Ni 2+ MgF 2 Since the first solid-state tunable laser operation was realized in a crystal (L.F.Johnson R.E.Dietz&H.J.Guggenheim, J.Phys.Rev.Lett., 11(1963)318), many tunable laser crystals have been discovered, such as Ti 3+ :Al 2 o 3 、Cr 3+ :Mg 2 SiO 4 、Cr 3+ :LiSrAlF 6 、Cr 3+ :BeAl 2 o 4 etc., but due to various reasons, most tunable laser crystals are limited to laboratory tools and cannot be promoted to industrial applications

The tunable laser crystal that has been studied the most and has entered the application field is Cr 3+ :BeAl 2 o 4 (Alexandrite), Ti 3+ :Al 2 o 3 (titanium-doped sapphire) and Cr 3+ :LiCaAlF 6 、Cr 3+ :LiSrAlF 6 , but considering factors such as the tunable wavelength range, absorption coefficient, emission cross-section, pumping method, and growth process of the crystal, there is currently no crystal that can well meet people's needs. Therefore, the new tunable laser crystal R&D is still under the spotlight