Nonlinear single crystal Gallium Selenide (GaSe)

Nonlinear single crystal Gallium Selenide (GaSe) is very suitable for SHG in the mid-IR. Gallium Selenide (GaSe) single crystal is combining a large non-linear coefficient, a high damage threshold and a wide transparency range. The frequency-doubling properties of nonlinear single crystal Gallium Selenide (GaSe) were studied in the wavelength range between 6.0 µm and 12.0 µm.

For wavelength greater than 13.0 µm the angles of incidence become prohibitively large due to the cut along the (001) plane. Furthermore, the nonlinear single crystal Gallium Selenide (GaSe) shows appreciable walk-off between the fundamental and the generated second harmonic. External conversion efficiencies between 8% and 22% were reached, depending on the wavelength. At wavelength of 7.8 µm a direct comparison of ZnGeP2 and GaSe under idential experimental conditions was made, where all efficiency factors could be neglected. The deduced ratio of the non-linear coefficient of ZnGeP2 and GaSe is 2.1.

APPLICATIONS of nonlinear single crystal Gallium Selenide (GaSe):

- For second harmonic generation of CO2-lasers
- For up-conversion of CO2-laser radiation image into near-IR or visible region
- For frequencies mixing in the middle IR region
- For differencial frequencies generation (DFG) in the middle IR region from 5.5 to 18.0 µm
- For tunable solid state lasers using OPO, pumped by Nd:YAG and others lasers

Nonlinear single crystal Gallium Selenide (GaSe) is applicable in areas of research, development, education & production: photonics, optic, laser technology, telecommunications, electronic.

More information about Nonlinear single crystal Gallium Selenide (GaSe) You can find on the Homepage MolTech GmbH:

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