Cr4+:YAG Crystal Material General Description
Cr⁴⁺:YAG Crystal is an advanced material designed for passive Q-switching in solid-state lasers, such as Nd:YAG, Nd:YLF, and Nd:YVO₄. Its cubic garnet structure ensures durability, high thermal conductivity, and excellent damage threshold. Cr4+:YAG Crystal can efficiently operate without active electronic components, reducing system complexity and cost.
Photonics On Crystals provides Cr⁴⁺:YAG crystals with doping levels between 0.03 and 0.05 mol%. Available sizes range from 2 × 2 mm² to 14 × 14 mm² with lengths from 0.1 mm to 12 mm. Initial transmission can be tailored from 10% to 92% per customer requirements.
Cr4+:YAG CrystalGeneral Applications and Examples
Cr⁴⁺:YAG crystals are widely used for passive Q-switching, enabling compact laser designs for high-energy pulse generation. Examples include:
Property | Specification |
Chemical Formula | Cr⁴⁺:Y₃Al₅O₁₂ |
Crystal Structure | Cubic Garnet |
Dopant Concentration | 0.03–0.05 mol% |
Mohs Hardness | 8.5 |
Refractive Index | 1.82 at 1064 nm |
Damage Threshold | >500 MW/cm² at 1064 nm |
Melting Point | 1970°C |
Property | Value |
Transmission Range | 950–1200 nm |
Refractive Index (1064 nm) | 1.82 |
Damage Threshold | >500 MW/cm² |
Ground-State Absorption (σₐ) | 4.4 × 10⁻¹⁹ cm² at 1064 nm |
Emission Cross-Section (σₑ) | 8.2 × 10⁻²⁰ cm² at 1064 nm |
Recovery Time (τ) | 3.4 µs |
Specification | Value |
Dimensions | 3 × 3 mm² to 20 × 20 mm² |
Length | 0.1 mm to 12 mm |
Dimensional Tolerance | ±0.05 mm |
Surface Flatness | < λ/10 @ 632 nm |
Parallelism | <20 arc seconds |
Perpendicularity | <15 arc minutes |
Surface Quality (Scratch/Dig) | 20–10 |
Cr⁴⁺:YAG exhibits a wide absorption band extending from 950 to 1200 nm with prominent peaks around 1020–1070 nm. The material is optimized for high-energy Nd and Yb laser pumping.
Coating Type | Reflection (R) |
AR Coating (1064 nm) | <0.2% |
Dual AR Coating | Optimized for 1064 and 1070 nm |
Adhesion Test Compliant with MIL-C-675C military standards, an adhesion test involved applying a tape that meets LT-90 specifications onto the lens film layer. The tape was affixed fully and then removed vertically. This procedure was performed three times, resulting in no blistering or peeling.
Temperature Test In line with MIL-C-675C specifications, test pieces were subjected to temperatures of -62±1℃ and 71±1℃. After maintaining them at room temperature (16℃~32℃) for two hours, the adhesion test was repeated, confirming no film detachment.
Abrasion Resistance Test Conforming to MIL-C-675C and CCC-C-440 standards, the abrasion resistance test involved a gauze tester applying a minimum force of 1.0 lbs (0.45 kg) to the film. This was repeated 25 times with gauze widths of 1/4 inch (6.4mm) and 3/8 inch (9.5mm), ensuring no damage occurred to the film surface.
Humidity Test Under MIL-C-675C criteria, the test piece was placed in a controlled temperature and humidity chamber set to 49 ±2℃ and 95%~100% humidity for 24 hours. The film remained intact, with no peeling, scratches, or other defects.
Solvent and Cleaning Testing Following MIL-C-675C specifications, test pieces were exposed to room temperature conditions (16℃~32℃) and tested with acetone and alcohol for at least 10 minutes each. After air drying and subsequent cleaning with a cotton cloth soaked in alcohol, the film surface showed no signs of peeling or scratches.
Salt Spray Test After 100 hours in a 35°C environment with a 5% saltwater concentration, the film showed no signs of damage.
Photonics On Crystals specializes in high-precision crystal fabrication, offering customization of initial transmission, dimensions, and coatings to meet unique laser system requirements. POC ensures rigorous quality control, including AR coatings for superior optical performance and high damage thresholds.
Face Dimensions | Initial Transmission | Coating | SKU | Price (USD) |
6 × 6 mm² | 10% | AR @1064 nm | 7201 | $220 |
6 × 6 mm² | 50% | AR @1064 nm | 7202 | $230 |
6 × 6 mm² | 90% | AR @1064 nm | 7203 | $240 |
3 × 3 mm² | 50% | Dual AR Coating | 7210 | $210 |
Custom Dimensions | Custom | Custom Coating | Custom | Request Quote |
