Sales engineer
Arminas Butkus +370 5 219 4884
AgGaSe2 crystals
INQUIRY FORM
Please fill out this field
Please fill out this field
Please fill out this field
Please fill out this field
Please fill out this field
Close
Close
Success!

One of our 4Lasers team members will contact you as soon as possible.

Go back to homepage

AgGaSe2 crystals

Main features

 

  • Excellent properties across the transmission range from 0,73 to 18 µm
  • Low optical absorption and scattering
  • High FOM (figure of merit) for non-linear interactions in NIR and MIR

 

Application examples

 

  • Frequency mixing in the IR region from 4,0 to 18,3 µm
  • Second harmonic generation and up-conversion for CO2 lasers
  • Tunable OPO for solid-state lasers with efficiency up to 10%
Request custom View stock
  • Description
  • Properties
  • Standard specifications
  • References

Silver gallium selenide (AgGaSe2, AGSe) is an optically negative uniaxial crystal with a reasonable transmittance over roughly 0,7 μm - 18 μm region. AGSe crystals have proven to be used in nonlinear parametric downconversion (difference frequency generation, DGF) in the Mid-IR range by tandem with commercially available synchronously-pumped optical parametric oscillators (SPOPOs) in the femtosecond and picosecond regime. AGSe crystal has one of the highest figure of merits (~70 pm2/V2) from commercially available mid-IR nonlinear crystals, which is six times larger than counterpart AGS. For some particular reasons AGSe is also a better choice over other mid-IR crystals. For example, even though GaSe has higher nonlinearity and comparable transparency region, AGSe has lower spatial walk-off and availability to be processed for particular application (growth and cut direction, dielectric thin-film coatings). ZGP has higher figure of merit, but its transparency region (~2-12 μm) is no match to AGSe.

Physical and optical properties
Chemical formula AgGaSe2
Crystal structure Tetragonal, 42m
Lattice parameters a= 5,9920 Å, c= 10,8803 Å
Optical symmetry Negative uniaxial (n> ne, λ < 804 nm ne > no)
Density 5,7 g/cm3
Mohs hardness 3-3,5
Transparency range 0,71 - 19 µm @“0“ transmittance level
Sellmeier equations @T=293 K (λ in μm) no2=6,8507 + 0,4297/(λ2 - 0,1584) - 0,00125 λ2;
ne2= 6,6792 + 0,4598/(λ2 - 0,2122) - 0,00126 λ2
Refractive indices no = 2,5917; ne = 2,5585 @10,5 µm
Thermal conductivity @T = 293 K 1 (||c) Wm-1K-1, 1,1 (⊥c) Wm-1K-1
Laser induced damage threshold >10 MW/cm2@10,6 μm, 150 ns
AgGaSe2 crystals
Orientation accuracy <30 arcmin
Clear aperture >80%
Face dimensions tolerance +0,0/-0,2 mm
Parallelism error <30 arcsec
Perpendicularity error <10 arcmin
Protective chamfers <0,2 mm at 45°
Surface quality 60-40 S-D
Coatings BBAR/[email protected],7-2,7 µm/5-18 µm
Mount Unmounted
Order your item
Face dimensions Length Theta Phi Coatings Application SKU PRICE QUANTITY
5x5 mm
10 mm
52°
45°
Ultrashort pulse [email protected],7-2,7 μm -> ~5-18 μm, type I
15805
Request
5x5 mm
2 mm
52°
45°
Ultrashort pulse [email protected],7-2,7 μm -> ~5-18 μm, type I
15806
Request
5x5 mm
5 mm
52°
45°
Ultrashort pulse [email protected],7-2,7 μm -> ~5-18 μm, type I
15807
Request