Nonlinear Crystals: AGS

Nonlinear Crystals: AGS


Nonlinear Crystals: AGS

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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