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Cr GSGG Passive Q-Switch Crystal

18 Jul 2019

Description

Cr:GSGG crystal—a crystal which shows high efficiency and high reliability.

Cr4+: GSGG has been utilized for the first time to provide a saturable absorber Q-switch for the ruby laser. Single output pulse operation (100 mJ and 27 ns duration) with efficiencies relative to the free-running ruby laser operation of 25-30% was routinely obtained. The crystalline material GSGG:Cr3+ is currently of interest as a broad-band, room temperature laser material. The small separation between the 4T2 and 2E electronic levels of Cr3+ in the system can result in interesting spectroscopic behaviour. People have investigated the temperature dependence of the CW and transient luminescence, and have found it to be consistent with a model for the dominant Cr3+ site in which the lowest energy 2E and 4T2 levels are approximately coincident in energy at low temperature.

Gadolinium scandium gallium garnet(GSGG) codoped with Cr is a laser material with high efficiency. An electro-optic shutter element was first utilized to provide Q-switched operation of the ruby laser. Passive Q-switched ruby lasers were achieved with saturable dye absorbers and colored glass (compounds of selenium and cadmium sulfide. Recently the operational characteristics of a dye Q-switch for a pulsed ruby laser was still studied for application in underwater holography. However, the dye Q-switch was limited in durability because of degradation (decomposition) of the dyes and the glass Q-switch was readily damaged. Thus, the tetravalent chromium doped gadolinium scandium gallium garnet Gd3Sc2Ga3O12 (Cr4+: GSGG) passive Q-switch ruby laser-offers for the first time high reliability, durability and high efficiency.

Parameter

Emission wavelength (nm) 1061.2
Emission cross section (pm2)a 13
R2->Y3 transition linewidth (cm-1) 11.5
Nd3+ fluorescence lifetime (ps) at low concentrations (<1017cm-3 ) 273-283
Nd3+ concentration for which lifetime is reduced by 50% (1020 Nd ions cm-3) 5
Refractive index at 1064 nm 1.9424
Index change with temperature, dn/dt,(10-6 k-1) 10.9
Elasto-optic constants  
P11 -0.012 ± 0.003
P12 0.019 ± 0.003
P44 -0.0665 ± 0.0013
Density (g*cm-3) 6.495
Heat capacity (J*g-1*K-1) 0.4029
Thermal conductivity (W*m-1*K-1) 6
Thermal expansion (10-6 K-1) 7.5
Poisson’s ratio 0.28
Young’s modulus (GPa) 210
Fracture toughness (MPa ) 1.2
Thermal- stress resistance (W*m-1)b 660
Room-temperature-absorption-specturm-of-the-Cr4GSGG-crystal

Feature

  • High reliability

  • High efficiency

  • High durability

  • Strong and saturable absorption

  • Good thermal conductivity

Application

Cr4+: GSGG used in saturable absorber Q-switch for the ruby laser:

The tetravalent chromium doped gadolinium scandium gallium garnet Gd3Sc2Ga3O12 (Cr4 + : GSGG) passive Q-switch ruby laser-offers for the first time high reliability, durability and high efficiency. Single output pulse operation (100 mJ and 27 ns duration) with efficiencies relative to the free-running ruby laser operation of 25-30% was routinely obtained.

CONTACT DETAILS
Nanjing Crylink Photonics Co.,Ltd
No.3, Hengda Road, Economic and Technological Development Zone, Nanjing, China
No.200,Zhaoxian Road,Jiading District,Shanghai City
Nanjing
Jiangsu
210038
China
Tel: (86)025-68790684
Fax: (86)025-68790685
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