CVD ZnSe Blanks

Overview

CVD ZnSe blanks are unfinished optical substrates used to manufacture custom infrared windows, lenses, prisms, beamsplitters, and laser system components. They are selected when a standard catalog optic does not match the drawing, mounting envelope, clear aperture, or downstream coating requirement.

For CO2 laser and infrared systems, ZnSe is valued for broad IR transmission, low absorption when the correct grade is selected, and compatibility with precision polishing and AR coating workflows. A blank should be specified as a starting material for fabrication, not as a finished optical element.

When to Specify a ZnSe Blank

Use CVD ZnSe blanks when your team needs control over final geometry, edge shape, thickness, coating target, or inspection plan. Typical downstream parts include protective windows, focusing lenses, wedge windows, prisms, plate beamsplitters, and custom machined IR substrates.

Define the final optic, machining allowance, coating wavelength, clear aperture, and handling limits before production.

Typical Specification Range

Parameter	Typical Value
Material	CVD Zinc Selenide (ZnSe)
Transmission Range	0.5-20 µm catalog range; 0.5-22 µm referenced in source material data
Diameter Range	10-400 mm
Thickness Range	1-100 mm
Final Geometry	Round, rectangular, prism, lens, window, or custom shape by drawing
Surface Condition	Defined by drawing, polishing route, or downstream fabrication plan
Coating	Uncoated blank or coating-ready part; AR coating targets available on request
Inspection Notes	Confirm material grade, clear aperture, internal quality, and documentation needs before production

Application Guidance

ZnSe blanks are most useful for programs that require custom infrared optics rather than off-the-shelf finished parts. They support CO2 laser beam delivery, thermal imaging, IR spectroscopy, beam combining, and optical prototyping where the final component must be manufactured to a specific drawing.

If the blank will become a high-power laser optic, confirm the operating wavelength, beam size, coating target, cooling or mounting method, and acceptable inspection criteria early. For imaging and sensing systems, confirm aperture, wedge or parallelism needs, and any downstream coating or bonding steps.

Custom Manufacturing Support

Send your drawing, target wavelength, finished part type, size range, tolerance needs, coating plan, and expected downstream process through OPTOstokes-IROptical contact. OPTOstokes-IROptical can review whether a ZnSe blank, finished ZnSe optic, or alternative IR material is the safer procurement route for your application.

For finished components made from similar substrates, compare ZnSe windows when defining downstream polishing, coating, and inspection requirements.