Nonlinear Crystals: AGSe
Nonlinear Crystals: AGSe
Description
AGSe (Silver Gallium Selenide) is a type of nonlinear crystal that is used for frequency conversion in the infrared and terahertz ranges. It has a high nonlinear coefficient and good transparency in the infrared and terahertz regions, making it a popular choice for many applications.
AGSe can be used for both sum frequency generation (SFG) and difference frequency generation (DFG). In SFG, two input laser beams of different wavelengths are combined in the AGSe crystal, resulting in a new output beam with a frequency equal to the sum of the input frequencies. This process is useful for producing radiation in the terahertz range, which has important applications in spectroscopy, sensing, and imaging.
In DFG, two input laser beams of different wavelengths are mixed in the AGSe crystal, resulting in a new output beam with a frequency equal to the difference between the input frequencies. DFG is useful for generating tunable infrared radiation, which has applications in spectroscopy, sensing, and imaging.
AGSe crystals can also be used in optical parametric oscillators (OPOs), which are devices that generate coherent light at a new frequency by using an input laser beam and a nonlinear crystal. OPOs using AGSe crystals are useful for producing tunable infrared and terahertz radiation, which has important applications in spectroscopy and imaging.
AGSe is a relatively new nonlinear crystal, but its high nonlinear coefficient and good transparency in the infrared and terahertz ranges make it a promising material for many applications. However, the quality of AGSe crystals can be highly dependent on the growth conditions, and they can be expensive and difficult to obtain in large sizes.
| Transparency range, µm | 0.71 - 18 |
| Point group | 4m2 |
| Lattice parameters, Å | a = 5.9921, c = 10.883 Å |
| Density, g/cm3 | 5.71 |
| Mohs hardness | 3.0 - 3.5 |
| Refractive indexes: | |
| at 1.06 µm | no = 2.7010; ne = 2.6792 |
| at 3.0 µm | no = 2.6245; ne = 2.5925 |
| at 5.3 µm | no = 2.6134; ne = 2.5808 |
| at 10.6 µm | no = 2.5912; ne = 2.5579 |
| at 12 µm | no = 2.5837; ne = 2.5505 |
| Non-linear coefficient at 10.6 µm, pm/V | d36 = 33 |
| Walk off | 0.68° at 5.3 µm |
| Optical damage threshold at 10.6 µm, 150 ns, MW/cm2 | 10 - 20 |
| Thermal expansion coefficient | |
| parallel to c-axis | 16.8 x 10-6 x °C-1 |
| perpendicular to c-axis | -7.8 x 10-6 x °C-1 |
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