Del Mar Photonics

Researches at the Laboratory for Energy Conversion at ETH Zurich use custom infrared optics supplied by Del Mar Photonics in the wind tunnel measurements at high temperatures and highly turbulent flow from the jets.

The ZnSe window with high accuracy antireflective coating enabled an IR transmittance of more than 92% for our wind tunnel.
The main flow was heated to 120 C and the coolant jet to -20C. The wind tunnel window which allowed infrared access was made of ZnSe provided by Del Mar of large dimension of 100 x 100 x 10. We managed to test many geometries and operating conditions even at high temperatures and highly turbulent flow from the jets. more

ZnSe window specification
ZnSe square window
Material: ZnSe IR optical grade
Dimensions: 100 x 100 mm (+0/-0.2 mm)
Thickness: 10 mm (+/- 0.2 mm)
Geometry: plano-plano window
Parallelism: ≤ 5 arc min
Surface quality: 60/40 both faces
Surface accuracy: N=1 fringe per
1 inch of surface at 633nm
Clear aperture: 90% of dimensions
Coating: AR/AR at 7.5-14 microns
Part number: ZnSe_D100_100_10_AR7.5_14

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