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GaAs Focusing Lenses for CO2 Lasers


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Specifications:

Materials GaAs Size Tolerance +0.0/-0.1mm
Central Thickness Tolerance +/-0.1mm Surface Quality 40/20 S/D
Frings (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 Parameters:

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:

Following modules and types of the CO2 laser GaAs focusing lenses are available in stock:

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) provides an alternative to ZnSe in medium and high-power CW CO2 laser systems for lenses and rear mirrors. GaAs is particularly useful in applications where toughness and durability are important. Its hardness and strength make GaAs a good choice where dust or abrasive particles tend to build up or bombard the optical surface. Softer substrates allow particles to imbed in the optic even when the best coatings are used.

Two series of CO2 laser lenses: Plano-convex series lenses and meniscus series lenses are developed and available in our stock for your choice. Our meniscus series lenses are optimal design in diffraction and aberration, which makes the laser beam has a minimum beam-spot diameter. Hangzhou Shalom EO also offer the optimal design service for your meniscus lenses.