This round optical flat is the perfect choice for thin film coating witness samples. Other uses include laser windows, holography and gauge blocks, or whatever else you need a precision flat borosilicate glass disk for. Choose Substrate Sales optical glass to fulfill your witness coupon needs. Substrate Sales glass has undergone thorough quality control procedures including transmittance measurements using a Perkin Elmer spectrophotometer and checks for flatness using a monochromatic light source. Flatness and surface roughness are also confirmed used a Dektak stylus profilometer. This quality control process ensures you will receive the finest quality.
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