Barium nitrate crystals
Main features
- Transparency range from 350 nm to 1800 nm
- Raman frequency shift of 1048 cm-1
- Excellent Raman shifter for nanosecond applications
- Custom crystal dimensions, and coatings available upon request
Application examples
- External cavity Raman laser pumped by commercially available passively Q-switched nanosecond Nd:YAG laser
- Generation of 1,59 "eye-safe" radiation, which coincides with CO2 absorption line
- Description
- Properties
- Standard specifications
Barium nitrate (Ba(NO3)2) is one of the leading crystals among solid-state Raman shifters in terms of Raman gain coefficient, which is known to be the highest at nanosecond steady-state regime (gR = 47 cm/GW@532 nm pump). Barium nitrate also features a moderately broad transparency range (0,33-1,8 μm) and high damage threshold. Drawbacks of barium nitrate crystal are low thermal conductivity (1,17 Wm-1K-1) and high electro-optic coefficient (dn/dT = -20 × 10-6K-1), which lead to the thermal lensing effect. The crystal is soft and hygroscopic, therefore should be treated with caution. 4Lasers recommend using barium nitrate as a Raman shifter for nanosecond applications. Minimum order quantity: 2 pieces of standard elements.
Physical and optical properties | |
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Chemical formula | Ba(No3)2 |
Crystal structure | Cubic, P213 |
Lattice parameters | a = b = c = 8,11 Å |
Density | 3,25 g/cm3 |
Mohs hardness | 2,5-3 |
Transparency range | 0,33-1,8 μm |
Refractive index | 1,555@1064 nm |
Thermal conductivity | 1,17 Wm-1K-1@||c |
Thermal expansion coefficient | 13 × 10-6 1oC-1 |
dn/dT | -20 × 10-6 K-1 |
Raman frequency shift | 1047 cm-1 |
Raman linewidth | 0,4 cm-1 |
Raman gain (ns, steady-state regime) | 47 cm/GW@532 nm 11 cm/GW@1064 nm |
Dephasing time | 28 ps |
Barium nitrate crystals | |
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Orientation | [110] |
Clear aperture | >85% |
Face dimensions tolerance | ±0,5 mm |
Length tolerance | ±1 mm |
Parallelism error | <5 arcmin |
Perpendicularity error | <10 arcmin |
Protective chamfers | <0,25 mm at 45˚ |
Surface quality | 40-20 S-D |
Surface flatness | <λ/4@632,8 nm |
Coatings | AR@500-700 nm |
Laser-induced damage threshold | >10 J/cm2@1064 nm, 10 ns |
Mount | Unmounted |