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  Optical Materials / Gallium Arsenide (GaAs)

Gallium Arsenide (GaAs)

      RGQ and Order
Gallium Arsenide (GaAs)Gallium Arsenide (GaAs)
Gallium Arsenide (GaAs) Transmission Graph
Gallium Arsenide (GaAs) Transmission Graph
Semi-insulating 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.

GaAs is manufactured for semiconductor applications rather than optical applications, so careful material screening is vital in producing quality GaAs optics. At II-VI, we utilize our laser vacuum calorimetry capability and other techniques to screen out materials with voids, inclusions, or other defects which cause inferior optical performance.

GaAs optics are limited by crystal growth technology to diameters typically less than 10 cm. The material is non-hygroscopic, safe to use in laboratory and field applications, and chemically stable except when contacted with strong acids.


 

Material Properties

Optical Properties
Bulk Absorption Coefficient @ 10.6µm
<= 0.01 /cm
Temperature Change of Refractive Index @ 10.6µm
149 x 10-6/°C

Thermal Properties
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

Mechanical Properties
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

 

   
 
           
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