Key Features
- Wide transparency ranges suitable for diverse photonic applications.
- Prominent Raman shifts for efficient frequency conversion.
- Excellent thermal conductivity ensuring stability under high power.
- High optical damage threshold for durability in advanced laser systems.
- Customizable sizes, orientations, and coatings to meet specific requirements.
General Description
Raman crystals are essential components in photonics for frequency shifting and nonlinear optical applications. They exhibit unique properties such as broad transparency ranges and significant Raman gain coefficients, making them ideal for precision laser systems. With excellent mechanical stability and customizable features, Raman crystals are tailored for cutting-edge technologies in scientific research, medical applications, and industrial processes. Common materials include KGW, KYW, and barium nitrate, each designed for specific photonic requirements.
General Applications and Examples
- KGW Crystals: Widely used in Raman lasers for wavelength conversion and picosecond laser systems. Their dual Raman shifts (768 cm⁻¹ and 901 cm⁻¹) enable precise frequency control.
- KYW Crystals: Ideal for high-intensity laser applications, including medical lasers and defense systems. Raman shifts at 765 cm⁻¹ and 905 cm⁻¹ support versatile optical tuning.
- Barium Nitrate: Preferred for visible spectrum Raman applications, offering high gain and transparency.
Comparison of Crystals
| Property | KGW | KYW | Barium Nitrate |
|---|---|---|---|
| Transparency Range | 0.3 µm – 5 µm | 0.35 µm – 5.5 µm | 0.4 µm – 6 µm |
| Raman Shifts | 768 cm⁻¹, 901 cm⁻¹ | 765 cm⁻¹, 905 cm⁻¹ | 1047 cm⁻¹ |
| Thermal Conductivity | 2.6–3.8 W·m⁻¹·K⁻¹ | 3.3 W/m·K | ~1.8 W/m·K |
| Optical Damage Threshold | >10 J/cm² | >12 J/cm² | Moderate |
| Refractive Index | nₐ=1.982, nᵦ=2.096 | nₓ=1.9868, nᵧ=2.0055 | ~1.6–1.8 |
Standard Fabrication Specifications
| Specification | Value |
|---|---|
| Orientation | Customizable |
| Clear Aperture | >90% |
| Surface Quality (Scratch/Dig) | 10-5 S-D |
| Surface Flatness | <λ/8 @ 632.8 nm |
| Coating Options | AR coatings available |
| Parallelism Error | <20 arcsec |
Standard Products
| Crystal | Dimensions (mm) | Length (mm) | Coating | Price (USD) |
|---|---|---|---|---|
| KGW | 5 x 5 | 30 | Uncoated | 600 |
| KYW | 8 x 8 | 50 | AR (450–800 nm) | 1120 |
| Barium Nitrate | 10 x 10 | 40 | Customizable | TBD |