Pure YAG Windows
YAG is the single crystal Y3Al5O12 (Ytterium Aluminum Garnet) and one of the hardest and most durable materials. Pure YAG crystal has a good transmission from UV to IR and high chemical resistance and thermal conductivity. The mechanical and chemical stability of YAG is comparable to sapphire crystal, but YAG is unique with no birefringence and available with higher optical homogeneity and surface quality. Recently, YAG is commonly used for femtosecond white light (continuum) generation.
Application examples:
Continuum generation in YAG crystal pumped by ~ 800 nm
Continuum generation in MIR ~ 4.5 um from YAG pumped by 3100 nm
| Part No. | Aperture | Thickness | Orientation | Coating | Price | Availability | Add to Cart |
Basic Properties of YAG Crystal:
| Transparency Range: 250 - 4500 nm |
|
| Density: 4.5 g/cm3 | |
| Crystal Symmetry: Cubic | |
| Lattice Constants: a=b=c=12.01 Å | |
| Therm-Optic Coefficients: dn/dT = 7.3 x 10-6 /oC |
|
| Optical Homogeneity: Δn < 10-6 /cm | |
| Mohs Hardness: 8.5 | |
| Thermal Conductivity: 14 W/m/K | |
| Thermal Expansion Coefficients: | α = 7.8 x 10-6/K |
|
Sellmeier Equations (λ in mm ) : |
|
| Wavelength (nm) | n |
| 1400 | 1.8121 |
| 1000 | 1.8197 |
| 800 | 1.8245 |
Specifications of YAG Windows:
| Orientation: | [111] or as specified |
| Dimension Tolerance: | ±0.1 mm |
| Clear Aperture: | > 85% central area |
| Flatness: | λ/8 @ 633 nm |
| Surface Quality: | 20/10 Scratch/Dig |
| Parallelism: | < 1 arc min |
| Perpendicularity: | 3 arc min |
| Transmission Wavefront Distortion: | < λ/8 @ 632.8 nm |
| Bevel: | < 0.25 mm X 45° |
Contumum generation with YAG crystals:
Continuum generation in YAG crystal pumped by ~ 800 nm
Continuum generation in MIR ~ 4.5 um from YAG pumped by 3100 nm
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