NLO Crystals
AgGaS2

Melting Point:851 °C

Density:5.700 g/cm3

Mohs Hardness:3-3.5

Wavefront distortion:less than λ/6 @ 633 nm

Flatness:λ/6 @ 633 nm

Surface Quality:20/10

Parallelism:better than 1 arc min

Perpendicularity:5 arc minutes


  • Description
  • Features
  • Curve

AGS is transparent from 0.53 to 12 µm. Although its nonlinear optical coefficient is the lowest among the mentioned infrared crystals, high short wavelength transparency edging at 550 nm is made use of in OPOs pumped by Nd:YAG laser; in numerous difference frequency mixing experiments with diode, Ti:Sapphire, Nd:YAG and IR dye lasers covering 3–12 µm range; in direct infrared countermeasure systems, and for SHG of CO2 laser. Thin AgGaS2 (AGS) crystal plates are popular for ultrashort pulse generation in mid IR range by difference frequency generation employing NIR wavelength pulses.

Applications: 

● Generation second harmonics on CO and CO2 - lasers

● Optical parametric oscilator

● Different frequency generator to middle infrared regions up to 12 mkm.

● Frequency mixing in the middle IR region from 4.0 to 18.3 µm

● Tuneable solid state lasers (OPO pumped by Nd:YAG and others lasers operating in 1200 to 10000 nm region with efficiency 0.1 to 10 %)

● Optical narrow-band filters in the region near isotropic point (0.4974 m at 300 °K), transmission band being tuned at temperature variation 

● Up-conversion of CO2 laser radiation image into near-IR or visible region by using/ or use of Nd:YAG, ruby or dye lasers with efficiency up to 30 %


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