GaAs focusing lenses for CO2 lasers, GaAs plano-convex lenses; GaAs meniscus lenses

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Home >> Products >> Laser Components >> CO2 Laser Optics >> GaAs focusing lenses

GaAs Focusing Lenses for CO2 Lasers

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.

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Modules or Types
Specifications
Basic Properties

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 (mm)
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

Note: other types of focusing lenses are available upon customer’s request.

Physical and optical properties of GaAs
Bulk Absorption Coefficient @ 10.6µm	<= 0.01 /cm
Temperature Change of Refractive Index @ 10.6µm	149 x 10^-6/°C
hermal 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

Related products

Scanning mirrors for CO2 lasers

ZnSe focusing lenses

Silicon (Si） mirrors

Molybdenu (Mo) mirrors

Typical Specifications
Materials	GaAs
Size tolerance	+0.0/-0.1mm
Central thickness tolerance	+/-0.1mm
Surface quality	40/20 S/D
Frings (N)	<3
Irregularity(ΔN)	<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)

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GaAs Focusing Lenses for CO2 Lasers

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GaAs Focusing Lenses for CO2 Lasers

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