Esco Optics, Inc.

Precision Flat Windows, S1-UV Grade Fused Silica

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$51.48 $71.5 In stock

Category: Precision Flat

UV Fused Silica laser quality round windows range from 0.25 waves (λ/4) to 0.10 wave (λ/10) flat. Catalog parallel specifications are either 5" arc seconds or 10' arc minutes. Ideal for interferometer flats, laser windows, beamsplitter substrates, and parallel plates. 

Note: Flatness and Paralellism units are are expressed as (waves - arc min)

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Customer Reviews (4.6 / 5 · 5 reviews)

Thomas ★★★★★

The surface quality on these windows is exceptional—my beam profile stayed clean even after hours of running. The λ/10 flatness spec held up exactly as promised when I checked with my interferometer, and at this price I’m genuinely impressed.

Christopher I. ★★★★★

Swapped these into my UV laser setup and the beam profile cleaned up immediately. The λ/10 flatness is genuine, not marketing numbers, and I checked it against a reference flat before mounting. Zero wavefront distortion at 355nm, which is exactly what I needed.

Robert ★★★★★

Ordered the 10 arc minute parallel spec and the transmitted wavefront looked clean across the whole aperture. Fringe pattern under my interferometer was textbook straight, no wedge tilt worth complaining about. Using it to seal a UV beamline and the fused silica has held up fine after a few weeks.

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