【可选包装：S2005A1-1(1片装）S2005A1-5（5片装）S2005A1-20（20片装）】

Sapphire substrates are ideal for use instead of glass substrates when optical transmission is required in the ultraviolet (above 200 nm) or infrared (below 5 μm) range. Low-temperature optical measurements will also benefit from the higher thermal conductivity of sapphire substrates, and they may also be used in high temperature environments up to 2300 K.

Product Specifications

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We offer sapphire substrates with three different surface finish qualities. Our 'Standard' sapphire substrates have been polished to a surface quality of 60/40 scratch-dig, have an RMS roughness of ~0.3 nm, and are suitable for most applications (including spectroscopy or thin-film deposition).

In comparison, our 'Ultra Smooth' sapphire substrates have been polished to a surface quality of 10/5 scratch-dig, have an RMS roughness of ~0.1 nm, and are suitable for applications involving atomic force microscopy, 2D materals, or any application where surface quality is crucial.

We also stock sapphire with a 'Coarse' surface finish (although still smoother than most glass substrates) with better than 80/50 scratch-dig and a slightly higher RMS roughness of ~0.7 nm. If you are not concerned about small amounts of optical scatter, these substrates are ideal.

Properties	Standard	Ultra Smooth	Coarse
Substrate size	20 mm x 15 mm	20 mm x 15 mm	20 mm x 15 mm
Thickness	1.1 mm	1.1 mm	1.1 mm
Material	Synthetic sapphire	Synthetic sapphire	Synthetic sapphire
Surface finish (scratch-dig)	60/40 (both sides polished)	10/5 (both sides polished)	Better than 80/50 (both sides polished)
Surface roughness (RMS)	~0.3 nm	~0.1 nm	~0.7 nm
Surface orientation	C-plane	C-plane	C-plane
Applications	UV/optical/NIR spectroscopy	Atomic force microscopy, 2D material substrate	UV/optical/NIR spectroscopy

Atomic force microscope images of the surface of sapphire substrates. Left: 'Standard' surface finish (scratch-dig 60/40). Center: 'Ultra Smooth' surface finish (scratch-dig 10/5). Right: 'Coarse' surface finish (scratch-dig better than 80/50).

Comparison Between Float Glass and Sapphire

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Properties	Float Glass	Sapphire
Hardness (Mohs)	5.5	9
Density (g/cm3)	~2.5	3.975
Compressive strength (MPa)	1000	2000
Transmission window (nm)	~350-2000	~200-5000
Refractive index n (k) 300 nm 600 nm 2000 nm 5000 nm	1.55 (5.0×10-5) 1.52 (4.5×10-7) 1.50 (4.4×10-6) 1.39 (3.0×10-3)	1.91 (1.7×10-8) 1.76 (2.0×10-8) 1.74 (2.5×10-8) 1.62 (3.1×10-8)
Thermal conductivity (W/m.K) 30 K 300 K	0.2 0.9	10000 40
Melting point (K)	950	2300
Specific heat capacity (J/K.kg)	870	750