| Crystal type | cubic |
| Lattice constant | a=5.657Å |
| Density | 5.27 g/cm3 at 25° C |
| Melting point | 1525 ° C |
| Refractive index | 2.417 - 2.385 @ 8 - 13 m m 2.40272 at 10.6 m m |
| Transmission band | 0.6 to 20 m m |
| Bulk absorption coefficient | 5 ´ 10-4 cm-1 @ 10.6 m m |
| Young's Modulus | 6.72 ´ 109 dynes/mm2 |
| Specific Heat at 25 ° C | 0.085 ca/g° C |
| Linear thermal expansion | 7.57 ´ 10-6 /° C at 20° C |
General Specifications of Zinc Selenide Optical Components
| Material | ZnSe |
| Surface Quality | 40-20 scratch & dig |
| Clear aperture | 90% of diameter |
| Diameter tolerance | +0.0, -0.1 mm |
| Thickness tolerance | +0.1, -0.25 mm |
| Surface Irregularity | l /2 per inch @ 633 nm over clear aperture |
| Coatings | Typical available coatings for ZnSe include BBAR for 0.8 to 2.5µm, 3 to 5µm, 1 to 5µm, 8 to 12µm, and the 3 to 12µm spectral regions and single wavelength AR coating at 10.6µm R£ 0.5% per surface. Many other specialized wavelength bands are possible within the 0.6 to 16µm range. |
Standard ZnSe windows (uncoated)
| Diameter, mm | Thickness, mm |
Cat.-No |
12.5 (or 0.5") |
2.0 |
40701 |
25.0 (or 1") |
3.0 |
40703 |
40.0 (or 1.5") |
4.0 |
40705 |
50.0 (or 2") |
5.0 |
40707 |
Although zinc selenide has this clear advantage over silicon and germanium, unfortunately it is not an easy material from which to produce optics. Firstly, it is not a naturally occurring material and has to be synthesized using a difficult process (CVD). Secondly, the dust, which is generated when zinc selenide is ground and polished constitutes a significant health hazard as a cumulative toxin. Also, it is not a particularly hard substance and scratches easily.
Refractive Index
Wavelength, µm |
2.75 |
5.00 |
7.50 |
9.50 |
11.0 |
12.5 |
13.5 |
15.0 |
16.0 |
16.9 |
17.8 |
18.6 |
19.3 |
20.0 |
Refractive Index |
2.44 |
2.43 |
2.42 |
2.41 |
2.40 |
2.39 |
2.38 |
2.37 |
2.36 |
2.35 |
2.34 |
2.33 |
2.32 |
2.31 |
Transmission
Although the internal transmittance of zinc selenide is very high (absorption <= 0.0005cm-1 at 10.6mm), the relatively high refractive index (2.4 at 10.6m m) cause reflection losses of nearly 30%. Unless such losses can be tolerated, zinc selenide optics should always be antireflection coated. Because of the high refractive index, single and double layer antireflection coatings can be very effective.
Zinc selenide is not hygroscopic unlike certain salts which are used for windows in the infrared.
ZnSe hemicylindrical prisms
Part number: ZnSe_hemicyl_prism_25.4_12.7
Type: hemicylindrical
prisms
Material: ZnSe optical grade
Height 25.4 mm (+/-0.2 mm),
Radius: 12.7 mm (+0.0/-0.2 mm)
Center thickness: 12.7 mm
(+/-0.1mm)
Angular deviation: +/-3 arc min,
2 faces polished: SQ 60-40 scr-dig
Other faces: fine ground.
Coating: none
Part number:
FS_hemicyl_prism_25.4_12.7
Type: hemicylindrical
prisms
Material: Fused Silica
Height 25.4 mm (+/-0.2 mm),
Radius: 12.7 mm (+0.0/-0.2 mm)
Center thickness: 12.7 mm
(+/-0.1mm)
Angular deviation: +/-3 arc min,
2 faces polished: SQ 60-40 scr-dig
Other faces: fine ground.
Coating: none
To receive a quote for any of the above items or custom optics please e-mails our sales team
Del Mar Photonics - Greyhawkoptics
AXICON
Axicon featured application:
Extended focus depth for Fourier domain optical
coherence microscopy
Dynamically adjustable annular laser
trapping based on axicons
Long distance transport of ultracold atoms using a 1D optical
lattice -
pdf
Transcutaneous fiber optic Raman spectroscopy of bone using annular
illumination and a circular array of collection fibers -
pdf
Inverse Spatially Offset Raman Spectroscopy for
Deep Noninvasive Probing of Turbid Media
Laser Triggering of Water Switches in
Terrawatt-Class Pulse Power Accelerators -
pdf
Cellular Imaging and Analysis of Polarized Membrane Traffic
Total Internal
Reflections Fluorescence Microscopy
TIRFM imaging (also
called evanescent wave microscopy)
Fused Silica Optics
Fused Silica Windows in stock
Fused Silica Substrates in stock
UV Grade Fused Silica Windows in stock
UV Grade Fused Silica Substrates in stock
Greyhawk Optics Catalogue: Fused
Silica Windows
Greyhawk Optics Catalogue: Fused
Silica Substrates
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Barium Fluoride Optics
BaF2 slides - Barium Fluoride slides - disk - BaF2 windows for IR spectrometers - BaF2 windows in FTIR
Calcium Fluoride Optics
Pyrex Mirrors -
EL
Pyrex mirrors with
protected gold coating
Rutile prisms
Rutile coupling prisms
Rutile prism for tuning lasers
Thin film waveguides
Del Mar Photonics - Greyhawkoptics
ZnSe optical components
ZnSe hemicylindrical prisms - Zinc Selenide hemicylindrical prisms
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