Commercial Quality Square Windows

Non-precision, square windows commonly used for sight glasses, instrument windows, beamsplitter substrates, vacuum windows, etc. All catalog windows can be customized to your specification, whether modification of dimension or adding a thin film coating. Read more about modifying a catalog optic.

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Borofloat 33 square window

Commercial Quality Windows, Square, Borofloat 33
Fused Quartz square optical window, Quartz optical window

Commercial Quality Windows, Square, G1 Commercial Grade Fused Quartz
IR Fused Silica square window

Commercial Quality Windows, Square, I2-IR Low OH Grade Fused Silica
N-BK7 square window, Schott BK7 window

Commercial Quality Windows, Square, N-BK7 Optical Glass
UV Fused Silica round window, S1-UV optical window

Commercial Quality Windows, Square, S1-UV Grade Fused Silica

Quality Optics from a Trusted Supplier

American Owned & Operated

Esco Optics is a leading manufacturer of custom and catalog optics, precision optical components, and ITAR optics in the United States.

Military & Defense Supplier

As the leader for military and defense optics in the United States, Esco Optics adheres to the International Traffic in Arms Regulations.

ITAR Registered & Compliant

ITAR registered and compliant, Esco manufactures ITAR optics for all of its customers with the strictest confidentiality.