Specifications:
| Materials | GaAs | Size Tolerance | +0.0/-0.1mm |
| Central Thickness Tolerance | +/-0.1mm | Surface Quality | 40/20 S/D |
| Fringes (N) | <3 | Irregularity(delta N) | <1 |
| Centration | <3’ | Tolerance of Focal Length | +/-1% |
| Aperture | >90% | Chamfer | 0.1-0.3mmx45degree |
| Coating | AR/AR@10.6μm (T>99.5%@10.6μm) |
Physical and Optical Properties:
| Bulk Absorption Coefficient @ 10.6µm | <= 0.01 /cm | Temperature Change of Refractive Index @ 10.6µm | 149 x 10-6/°C |
| Thermal Conductivity @ 20° C | 0.48 W/cm/°C | Specific Heat | 0.325 J/g/°C |
| Linear Expansion Coefficient @ 20° C | 5.7 x 10-6/°C | Young’s Modulus | 83 GPa (12.04 x 106 psi) |
| Rupture Modulus | 138 MPa (20,000 psi) | Knoop Hardness | 750 kg/mm2 |
| Density | 5.37 g/cm3 | Poisson’s Ratio | 0.31 |
| Wavelength(µm) | Index | Wavelength(µm) | Index | Wavelength(µm) | Index | Wavelength(µm) | Index |
| 2.6 | 3.3239 | 5.4 | 3.2991 | 8.2 | 3.2868 | 11.0 | 3.2725 |
| 2.8 | 3.3204 | 5.6 | 3.2982 | 8.4 | 3.2859 | 11.2 | 3.2713 |
| 3.0 | 3.3169 | 5.8 | 3.2972 | 8.6 | 3.2849 | 11.4 | 3.2701 |
| 3.2 | 3.3149 | 6.0 | 3.2963 | 8.8 | 3.2840 | 11.6 | 3.2690 |
| 3.4 | 3.3129 | 6.2 | 3.2955 | 9.0 | 3.2830 | 11.8 | 3.2678 |
| 3.6 | 3.3109 | 6.4 | 3.2947 | 9.2 | 3.2818 | 12.0 | 3.2666 |
| 3.8 | 3.3089 | 6.6 | 3.2939 | 9.4 | 3.2806 | 12.2 | 3.2651 |
| 4.0 | 3.3069 | 6.8 | 3.2931 | 9.6 | 3.2794 | 12.4 | 3.2635 |
| 4.2 | 3.3057 | 7.0 | 3.2923 | 9.8 | 3.2782 | 12.6 | 3.2620 |
| 4.4 | 3.3045 | 7.2 | 3.2914 | 10.0 | 3.2770 | 12.8 | 3.2604 |
| 4.6 | 3.3034 | 7.4 | 3.2905 | 10.2 | 3.2761 | 13.0 | 3.2589 |
| 4.8 | 3.3022 | 7.6 | 3.2896 | 10.4 | 3.2752 | 13.2 | 3.2573 |
| 5.0 | 3.3010 | 7.8 | 3.2887 | 10.6 | 3.2743 | 13.4 | 3.2557 |
| 5.2 | 3.3001 | 8.0 | 3.2878 | 10.8 | 3.2734 | 13.6 | 3.2541 |
Modules or Types:
| Diameter (mm) | Edge-thickness (mm) | Materials | Lens Types(Optional) | Focal Length (mm) (optional) | Wavelength(μm) |
| 12 | 2 | GaAs | Plano-Convex or Meniscus | 25.4/38.1/41/50.8/63.5/100 | 10.6 |
| 18 | 2 | GaAs | Plano-Convex or Meniscus | 25.4/38.1/41/50.8/63.5/100 | 10.6 |
| 19 | 2 | GaAs | Plano-Convex or Meniscus | 25.4/38.1/41/50.8/63.5/100 | 10.6 |
| 20 | 2 | GaAs | Plano-Convex or Meniscus | 25.4/38.1/41/50.8/63.5/100 | 10.6 |
| 25 | 2 | GaAs | Plano-Convex or Meniscus | 25.4/38.1/41/50.8/63.5/100 | 10.6 |
| 25.4 | 2 | GaAs | Plano-Convex or Meniscus | 25.4/38.1/41/50.8/63.5/100 | 10.6 |
| 30 | 2 | GaAs | Plano-Convex or Meniscus | 25.4/38.1/41/50.8/63.5/100 | 10.6 |
| 38.1 | 2 | GaAs | Plano-Convex or Meniscus | 25.4/38.1/41/50.8/63.5/100 | 10.6 |
Semi-insulating Gallium Arsenide (GaAs) Lenses stand out with their appealing attributes of superior robustness. GaAs lens provides an alternative to the ZnSe lens in medium and high-power continuous wave CO2 lasers. GaAs are useful in particular when toughness and durability are important. Its hardness and strength render GaAs lenses a good choice where dust or abrasive particles tend to build up or bombard the optical surface. While substrates made of other softer materials allow particles to be embedded in the mirrors even when the best coatings are used.
North Optics offers standard and custom GaAs Lenses optimized for CO2 lasers and various applications, including two lens shapes: Plano-convex GaAs lenses and meniscus GaAS. The plano-convex lenses are the more conventional option if you have less stricter requirement for the spherical aberration, the meniscus lenses are engineered to reduce the diffraction and aberration, ensuring the laser beam has a minimum beam-spot diameter. Shanghai North Optics also offers design services for meniscus-shaped GaAs lenses, specified products can be tailored for optimum optical functionalities.
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