Chromium-doped molybdic acid aluminum rubidium tunable laser crystal, and preparation method and application thereof

Abstract

The invention discloses a tunable laser crystal doped with chrome, molybdenum, acid, aluminium and rubidium, and a preparation method and application thereof, and relates to a laser crystal material which can be used as the working substance of a tunable solid laser; the method adopts 60 to 80at percent of Rb2Mo3O10 as fusing assistant, with the temperature reduction speed of 1 to 5 DEG C / day and the rotating speed of 5 to 30 revolutions / minute, and Cr3+:RbAl(MoO4)2 crystal with high quality and larger size grows; and the crystal belongs to the trigonal system and has P3ml(D3d<3>) space group structure and the refractive index of 1.73. The crystal can be used as the tunable laser crystal with the tunable range between 710 to 1000nm and the solid laser made by the crystal can be used in the fields of spectroscopy, biomedicine and military science and the like.

Description

technical field [0001] The invention belongs to the technical field of optoelectronic functional materials. In particular it relates to a laser crystal material as the working substance in tunable solid-state lasers. Background technique [0002] The so-called tunable laser refers to such an effect: the active ions doped in the solid matrix are excited by laser or pump lamp to generate laser output, and the prism tuning method, F-P etalon tuning method, grating tuning method, filter Methods such as tuning method and distributed feedback system tuning method can obtain tunable laser output. [0003] In 1963, L.F.Johnson et al. used flash lamp pumping, doped with Ni 2+ MgF 2 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). Subsequently, many tunable laser crystals appeared, 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., b...

AI Technical Summary

Problems solved by technology

Subsequently, many tunable laser crystals appeared, 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, many 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+ :Li CaAlF 6 、Cr 3+ :LiSrAlF 6 , but they also have some unavoidable defects that limit their application range

[0004] Cr 3+ :BeAl 2 o 4 The main disadvantages of (Alexandrite) crystals are: the tuning range is between 700 and 800nm, and the emission cross section is small (6×10 -21 cm 2 ), the required pumping threshold is high, and it also has the disadvantages of high damage rate and high thermal lens effect. In addition, because BeO is highly toxic, it also brings great difficulties to growth.

[0005] Ti 3+ :Al 2 o 3 The main disadvantage of the crystal is: the Ti in the crystal 3+ -Ti 4+ The appearance of ion pairs causes absorption in the laser output band, that is, the near-infrared band, which affects its laser performance, and because of its short lifetime of the upper energy level of the laser (only 3.2μs), it is necessary to use short pulse lasers, Q-switched lasers, continuous Pumping with a wave laser or a flash lamp that produces particularly short pulses further limits its applications.

However, there are also problems such as small absorption coefficient and low laser efficiency of LD pumping.