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Chromium-doped calcium magnesium silicate tunable laser crystal and preparation method thereof

A magnesium chromosilicate and laser crystal technology, applied in crystal growth, chemical instruments and methods, single crystal growth, etc., can solve problems such as small emission cross-section, difficult growth, and inability to promote industrial applications, and achieve tunable laser band wide, stable growth process, and excellent optical properties

Active Publication Date: 2013-06-26
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 and 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), Cr 3+ :LiCaAlF 6 and 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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Growing Cr by Czochralski Method 3+ Doping concentration of 0.5at.% Cr 3+ :CaMgSi 2 O 6 Crystal.

[0023] According to the molecular formula 1.0at.%Cr 3+ :CaMgSi 2 O 6 The molar ratio of each substance in the accurately weighed CaCO 3 , MgO, Cr 2 O 3 And SiO 2 Mix and grind uniformly in a ball mill. After tableting, solid-phase reaction is carried out at 800°C for 24 hours in a muffle furnace. After taking it out, it is ground, tableted, and heated to 1100°C for 24 hours. Load the synthesized sample above into φ60×40mm 3 In the iridium crucible, put it into the pulling furnace, using the pulling method, in the N 2 In the atmosphere, when the growth temperature is 1500℃, the crystal rotation speed is 20 rpm, and the pulling speed is 0.8 mm / hour, the size of the growth is φ32×25mm 3 High quality Cr 3+ :CaMgSi 2 O 6 Crystal.

Embodiment 2

[0024] Embodiment 2: The Czochralski method grows a Cr3+:CaMgSi2O6 crystal with a Cr3+ doping concentration of 5 at.%.

[0025] The CaCO3, MgO, Cr2O3, and SiO2, which are accurately weighed according to the molecular formula 5at.%Cr3+:CaMgSi2O6, are mixed and ground uniformly in a ball mill. After tableting, they are solid-phase reacted in a muffle furnace at 800°C. Hours, after taking it out, grinding, tableting, heating to 1100°C for 24 hours. Put the above synthesized sample into a φ60×40mm3 iridium gold crucible, put it into a pulling furnace, and use the pulling method. In a N2 atmosphere, the growth temperature is 1500℃, the crystal rotation speed is 10 rpm, and the pulling At a speed of 0.3 mm / h, a high-quality Cr3+:CaMgSi2O6 crystal with a size of φ30×22mm3 was grown.

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PUM

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Abstract

The invention provides a chromium-doped calcium magnesium silicate tunable laser crystal and a preparation method thereof. The crystal has a molecular formula of Cr<3+>:CaMgSi2O6. The crustal belongs to a monoclinic system, and a space group of C12 / c1. Cell parameters of the crystal are that a=9.741 angstrom, b=8.901 angstrom, c=5.257 angstrom, beta=105.97 DEG, V=439.1 angstrom<3>, Z=4, and Dc=3.271 g / cm3. Cr<3+>:CaMgSi2O6 is a same-composition molten compound. High-optical-quality and large-size crystals can be grown with a Czochralski method. Growth conditions comprise that: a growth temperature is 1500 DEG, a pulling speed is 0.2-0.8mm / h, and a crystal rotation speed is 10-20rpm. A tunable range is 700-1350nm. The crystal is possible to become a novel tunable laser crystal, and can be practically applied.

Description

Technical field [0001] The present invention relates to the technical field of optoelectronic functional materials, in particular to a laser crystal material as a working substance in a tunable solid-state laser. Background technique [0002] Tunable laser refers to the effect of pumping activated ions doped into the solid laser matrix to generate laser light, using prism tuning method, FP etalon tuning method, grating tuning method, filter tuning method and distributed feedback System tuning method, etc. to obtain tunable laser output. [0003] In 1963, L.F. Johnson et al. used flash lamp pumping, which was doped with Ni 2+ MgF 2 The first solid-state tunable laser operation was realized in the crystal (L.F. Johnson R.E. Dietz & H.J. Guggenheim, J. Phys. Rev. Lett., 11(1963) 318). Then appeared many tunable laser crystals, such as Ti 3+ :Al 2 O 3 , Cr 3+ :Mg 2 SiO 4 , Cr 3+ :LiSrAlF 6 And Cr 3+ :BeAl 2 O 4 However, due to various reasons, many tunable laser crystals are limited t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/34C30B15/00H01S3/16
Inventor 王国富黄溢声米红星林州斌张莉珍
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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