NIR-IR non-linear crystals
Nonlinear optical crystals LGSe (LiGaSe2)
LGSe
Main properties
| Compound | LiGaSe2 | |
| Transparency range, µm | 0.37 – 13.2 | |
| Symmetry | mm2 | |
| Band gap, eV (300K) | 3.57 | |
| Nonlinear susceptibility, pm/V (at 2.3 µm) |
d31=9.9; d24=7.7 @2,3 µm |
|
| Absorption edge in the far-IR on 0.2 transparency level | µm | 218 |
| THz | 1.37 | |
| Thermal conductivity k, WM/M°C | 4.8-5.8 calc. | |
| SHG cut off | 1.57 - 11.72 | |
The parameters of optical elements
| Orientation accuracy, arc min | < 30 | |
| Parallelism, arc sec | < 30 | |
| Flatness | 546 nm | λ/4 |
| Surface quality, scratch/dig | 30/20 | |
Application
LGSe is a very recently proposed IR new nonlinear materials with a wurtzite-type structure and UV transmission down to 0.38. OPO, OPA, DFG to obtain mid-IR Crystals of LiBC2 group are characterised by a set of important physical parameters, such as large band gap, low two photon absorption, wide transparency range, including THz window, low group velocity mismatch, high thermal conductivity, low anisotropy of thermal expansion coefficient, etc. which lead to effective use in tunable laser systems in wide spectral range.
We are able to provide suitable Anti-reflection / Protective, etc. coatings tailored to customer’s specifications, reflectivity curves are applied upon request.
Nonlinear optical crystals LGS (LiGaS2)
LGS
Main properties
| Compound | LiGaS2 | |
| Transparency range, µm | 0.33 – 11.6 | |
| Symmetry | mm2 | |
| Band gap, eV | 4.15 | |
| Nonlinear susceptibility, pm/V (at 2.3 µm) |
d31=5.8; d24=5.1; d33= -10.7 |
|
| Absorption edge in the far-IR on 0.2 transparency level | µm | 92 |
| THz | 3.25 | |
| Optical Damage Threshold, MW/cm2 | 1064 nm (t=14 ns) |
>240 |
| Thermal conductivity k, WM/M°C | 6-8 calc. | |
| SHG cut off | 1.47 - 7.53 | |
The parameters of optical elements
| Compound | LiGaS2 | |
| Orientation accuracy, arc min | < 30 | |
| Parallelism, arc sec | < 30 | |
| Flatness | 546 nm | λ/4 |
| Surface quality, scratch/dig | 30/20 | |
Application
LGS is a very recently proposed IR new nonlinear materials with a wurtzite-type structure and UV transmission down to 0.32. OPO, OPA, DFG to obtain mid-IR.
Crystals of LiBC2 group are characterised by a set of important physical parameters, such as large band gap, low two photon absorption, wide transparency range, including THz window, low group velocity mismatch, high thermal conductivity, low anisotropy of thermal expansion coefficient, etc. which lead to effective use in tunable laser systems in wide spectral range.
We are able to provide suitable Anti-reflection / Protective, etc. coatings tailored to customer’s specifications, reflectivity curves are applied upon request.
Nonlinear optical crystal AGS (AgGaS2)
AGS
(silver thiogallate)
Main properties
| Compound | AgGaS2 | |
| Transparency range, µm | 0.47 – 13 | |
| Nonlinear coefficient, pm/V | d36 = 12.6 @ 10.6 µm | |
| Negative uniaxial crystal | no > ne (at λ < 0.497 μm ne > no) | |
| Symmetry | Tetragonal, -42m point group | |
| Cell parameters, Å | a=5.757, c=10.311 | |
| Typical Reflection index |
10.6 µm 5.3 µm |
no=2.3475, ne=2.2918 no=2.3945, ne=2.3406 |
| Optical Damage Threshold, MW/cm2 | 1064 nm (t=10 ns) |
350 |
| Walk off angle, ° | 5.3 µm | 0.76 |
| Thermal conductivity k, WM/M°C | 1.5 | |
| Band-gap energy at room temperature, eV | Eg = 2.73 | |
| Optical activity ρ = 522deg/mm at isotropic point | n0= ne, λ = 0.4974 μm | |
| Absorption edge in the far-IR on 0.2 transparency level | 0.86 THz; 346 µm | |
The parameters of optical elements
| Orientation accuracy, arc min | < 30 | |
| Parallelism, arc sec | < 30 | |
| Flatness | 546 nm | λ/4 |
| Surface quality, scratch/dig | 30/20 | |
Application
- Efficient frequency doubling for mid-IR radiation
- Optical parametric oscilation and amplification, Different frequency generation to mid-infrared regions up to 12 µm
- Optical narrow-band filters in the region near isotropical point (0.4974 µm at 300 K)
Large/long optical elements are available, please, send your requests.
We are able to provide suitable Anti-reflection / Protective, etc. coatings tailored to customer’s specifications, reflectivity curves are applied upon request.
Nonlinear optical crystal AGSe (AgGaSe2)
AGSe
(silver gallium selenide)
Main properties
| Compound | AgGaSe2 | |
| Transparency range, µm | 0.76 – 18 | |
| Negative uniaxial crystal | no > ne (at λ < 0.804 μm ne > no) | |
| Nonlinear coefficient, pm/V | d36 = 39.5 @10,6 µm | |
| Symmetry | Tetragonal, -42m point group | |
| Typical Reflection index |
10.6 µm 5.3 µm |
no=2.5915, ne=2.5582 no=2.6138, ne=2.5811 |
| Optical Damage Threshold, MW/cm2 | 2000 nm (t=30 ns) |
13 |
| Walk off angle, ° | 5.3 µm | 0.68 |
| Thermal conductivity k, WM/M°C | 1.1 | |
| Band-gap energy, eV | 1.8 | |
| Optical activity ρ = 7deg/mm at isotropic point, μm | n0= ne, λ = 0.804 | |
The parameters of optical elemets
| Orientation accuracy, arc min | < 30 | |
| Parallelism, arc sec | < 40 | |
| Flatness | 546 nm | λ/4 |
| Surface quality, scratch/dig | 30/20 | |
Application
- Efficient frequency doubling for mid-IR radiation
- Optical parametric oscilation and amplification, Different frequency generation to mid-infrared regions up to 17 µm
- Optical narrow-band filters in the region near isotropical point (0.804 µm at 300 K)
Large/long optical elements are available, please, send your requests.
We are able to provide suitable Anti-reflection / Protective, etc. coatings tailored to customer’s specifications, reflectivity curves are applied upon request.
Nonlinear optical crystal GaSe
GaSe
(gallium selenide)
Main properties
| Compound | GaSe | |
| Transparency range, µm | 0.62 – 20 | |
| Nonlinear coefficient, pm/V | d22 = 54 @10.6 µm | |
| Symmetry | hexagonal, 6m2 point group | |
| Cell parameters, Å | a=3.74, c=15.89 | |
| Typical Reflection index |
10.6 µm 5.3 µm |
no=2.6975, ne=2.3745 no=2.7233, ne=2.3966 |
| Optical Damage Threshold, MW/cm2 |
1064 nm (t=10 ns) |
30 |
| Walk-off angle, ° | 5.3 µm | 4.1 |
Application
- SHG of 10.6 µm laser radiation
- Optical Parametric Oscillation, Amplification, DFG, etc. to mid-IR up to 17 µm
We are able to provide suitable Anti-reflection / Protective, etc. coatings tailored to customer’s specifications, reflectivity curves are applied upon request.
Nonlinear optical crystal LISe (LilnSe2)
LISe
(lithium indium selenide)
Main properties
| Compound | LilnSe2 | |
| Transparency range, µm | 0.43– 13.2 | |
| Nonlinear coefficient, pm/V | d31=11.78, d24=8.17 @2.3 µm | |
| Symmetry | Orthorhombic, mm2 point group | |
| Cell parameters, Å | a=7.192, b=8.412, c=6.793 | |
| Band gap, eV | 2.86 | |
| Typical Reflection index |
10.0 µm 5.0 µm |
nx=2.2015, ny=2.2522, nz=2.2566 |
| The fundamental wavelength ranges in µm for SHG | x-y, Type II, eoe | 2.73 – 8.24 |
|
x-z, Type I, ooe |
2.08 – 12.4 | |
|
y-z, Type II, oeo |
2.73 – 3.07 |
|
|
y-z Type II, oeo |
7.66 – 8.24 |
|
|
Total interval covered |
2.08 – 12.4 |
|
| Optical Damage Threshold, GW/cm2 | 1064 nm (t=10 ns) |
~40 |
| Thermal conductivity k, WM/M°C | kx=4.73 ± 0.3; ky=4.67 ± 0.3; kz=5.45 ± 0.3 | |
| Band-gap energy at room temperature, eV | Eg = 2.73 | |
| Absorption edge in the far-IR on 0.2 transparency level | 1.24 THz at 240 µm | |
The parameters of optical elements
| Orientation accuracy, arc min | < 30 | |
| Parallelism, arc sec | < 30 | |
| Flatness | 546 nm | λ/4 |
| Surface quality, scratch/dig | 30/20 | |
Application
- Optical parametric oscillation (OPO) in range 1 – 13 µm with pump Ti: Sapphire laser
- Different frequency generation in middle IR range (2-13 µm)
- For all crystals we are able to provide suitable Anti-reflection / Protective Coatings tailored to customer’s specific applications, providing reflectivity curves.
We are able to provide suitable Anti-reflection / Protective, etc. coatings tailored to customer’s specifications, reflectivity curves are applied upon request.
Nonlinear optical crystal LIS (LilnS2)
LIS
(lithium indium sulphide)
Main properties
| Compound | LiInS2 | |
| Transparency range, µm | 0.35– 13.2 | |
| Nonlinear coefficient, pm/V | d31=7.25, d24=5.66 @2.3 | |
| Symmetry | Orthorombic, mm2 point group | |
| Cell parameters, Å | a=6.893, b=8.0578, c=6.4816 | |
| Typical Reflection index |
1064 nm 532 nm |
nx=2.1305, ny=2.1668, nz=2.1745 |
| The fundamental wavelength ranges in µm for SHG | x-y, Type II, eoe | 2.35 – 6.11 |
|
x-z, Type I, ooe |
1.78 – 8.22 | |
|
y-z, Type II, oeo |
2.35 – 2.67 |
|
|
y-z Type II, oeo |
5.59 – 6.11 |
|
|
Total interval covered |
1.617 – 8.71 |
|
| Optical Damage Threshold, GW/cm2 | 1064 nm (t=14 ns) |
40 |
| Thermal conductivity k, WM/M°C | kx=6.1 ± 0.3; ky=5.9 ± 0.3; kz=7.4 ± 0.3 | |
| Absorption edge in the far-IR on 0.2 transparency level |
2.58 THz at 118 µm |
|
The parameters of optical elements
| Orientation accuracy, arc min | < 30 | |
| Parallelism, arc sec | < 30 | |
| Flatness | 546 nm | λ/6 |
| Surface quality, scratch/dig | 30/20 | |
Application
- Optical parametric oscilation (OPO) in range 1 – 12 µm with pump Ti: Sapphire laser
- Different frequency generation in middle IR range (2-12 µm)
We are able to provide suitable Anti-reflection / Protective, etc. coatings tailored to customer’s specifications, reflectivity curves are applied upon request.