Cr: GSGG

Cr GSGG crystal (Cr doped Gadolinium scandium gallium garnet)  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.

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.

• High reliability
• High efficiency
• High durability
• Strong and saturable absorption
• Good thermal conductivity

Cr⁴⁺: GSGG used in saturable absorber Q-switch for the ruby laser
The tetravalent chromium doped gadolinium scandium gallium garnet Gd₃Sc₂Ga₃O₁₂ (Cr^{4 +} : 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.
Optically pump-induced athermal and nonresonant refractive index changes in the reference Cr-doped laser materials: Cr:GSGG and ruby

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