High Reflective first surface Mirrors

High Reflective First Surface Mirrors

A first surface mirror or Front Surface Mirror (also commonly abbreviated FS mirror or FSM) is a mirror with the reflective surface being above a backing, as opposed to the conventional, second surface mirror with the reflective surface behind a transparent substrate such as glass or acrylic.

First Surface Mirrors are aluminized on the surface nearest the incident light. Light is reflected off the mirrored surface and does not pass through any glass, minimizing light loss.

Commercial grade optics are a step above experimental grade items. Commercial grade FS mirrors have are coated with Enhanced Aluminum, with a minimum reflection of 90%, and may increase as high as 95% for certain wavelengths. Surface accuracy is 4-6 wavelengths per inch. All have protected aluminum coatings.

Technical Specifications:

Diameter (mm)	5.0
Dimensional Tolerance (mm)	0.25
Clear Aperture (%)	85
Thickness (mm)	2.0
Thickness Tolerance (mm)	0.25
Surface Accuracy	@ 632.8nm
Surface Quality	60 - 40
Edges	Ground, 0.75mm Maximum Full Width Bevel
Substrate	BOROFLOAT
Coating Specification	Ravg>95% @ 450 - 650nm
Typical Energy Density Limit	0.2 J/cm2@ 532nm, 10ns
Wavelength Range (nm)	420 - 680
Type	Flat Mirror
Coating	Enhanced Aluminum
RoHS	Compliant

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Product Categories : Optical Mirrors > Front Surface Mirror