Nonlinear Crystals: AGS
Nonlinear Crystals: AGS
Description
AGS (Silver Gallium Selenide) is a nonlinear crystal that is commonly used in mid-infrared laser technology for frequency conversion. AGS has a high nonlinear coefficient and can efficiently convert light to longer wavelengths, making it useful for generating light in the mid-infrared range.
AGS is often used in optical parametric oscillators (OPOs), which are devices that produce coherent light at a new frequency by using an input laser beam and a nonlinear crystal. In an OPO, the AGS crystal is used to convert the frequency of the input laser beam to a longer wavelength in the mid-infrared range. This process is useful in applications such as spectroscopy, remote sensing, and medical imaging.
AGS is also used in difference frequency generation (DFG), which is a process that produces a new frequency that is equal to the difference between two input frequencies. In DFG, an AGS crystal is used to convert the frequency of two input laser beams to a new frequency in the mid-infrared range. This process is useful in applications such as gas sensing and atmospheric monitoring.
AGS is a relatively new nonlinear crystal, and its high nonlinear coefficient and broad transparency range make it an attractive material for mid-infrared frequency conversion. However, AGS crystals are difficult to grow, and their quality can be highly dependent on the growth conditions. As a result, AGS crystals can be expensive and difficult to obtain in large sizes.
| Transparency range, µm | 0.47 - 13 |
| Point group | 4m2 |
| Lattice parameters, Å | a = 5.757, c = 10.311 Å |
| Density, g/cm3 | 4.58 |
| Mohs hardness | 3.0 - 3.5 |
| Refractive indexes: | |
| at 1.06 µm | no = 2.4521; ne = 2.3990 |
| at 3.0 µm | no = 2.4080; ne = 2.3545 |
| at 5.3 µm | no = 2.3945; ne = 2.3408 |
| at 10.6 µm | no = 2.3472; ne = 2.2934 |
| at 12 µm | no = 2.3266; ne = 2.2716 |
| Non-linear coefficient at 10.6 µm, pm/V | d36 = 12.5 pm/V |
| Optical damage threshold at 10.6 µm, 150 ns, MW/cm2 | 10 - 20 |
| Walk off | 0.76° at 5.3 µm |
| Thermal expansion coefficient | |
| parallel to c-axis | 12.5 x 10-6 x °C-1 |
| perpendicular to c-axis | -13.2 x 10-6 x °C-1 |
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