Precision Flat Windows, N-BK7 Optical GlassEsco PN:
Our precision N-BK7 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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