optical flat


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optical flat

[′äp·tə·kəl ′flat]
(optics)
A disk of high-grade quartz glass approximately 2 centimeters thick, with a deviation in flatness usually not exceeding 0.05 micrometer all over, and a surface quality of 5 microfinish or less; used in determinations of surface contour and in comparison of lineal measurement.
A plane surface, with deviations from a plane surface generally not exceeding one-tenth of a wavelength of light, used to redirect light in a telescope or other optical instrument.
References in periodicals archive ?
The coated optical flat photoresist is then delivered to the pre-curing station.
I've already completed the perforated 8-inch optical flat and long-focus 6-inch primary for a Russell W.
Used to apply thin layers of coatings to increase or decrease the optical transmission on a lens or optical flat, the SPECTOR-HT is equipped with a powerful ion source, a high-voltage extraction system and a large substrate holder.
Their material can be polished to the mirror finish of a quartz optical flat, and has the optical reflectivity needed for interferometric calibration measurements.
Quotation are invited for Supply and installation of Calibration Equipments with Traceable Calibration Certificates & accessories at LARPM, CIPET-Bhubaneswar- Optical Flat Qty- 01 set, Inside Micrometer Checker/Calibrators Qty- 01Pc,High Accuracy micrometer Qty- 01Pc,etc
The upper section is a detachable spar made from a 33-inch length of heavy-walled 1-inch-diameter steel tubing that connects the 3-inch-diameter tube to the housing of the optical flat.
Tenders are invited for Optical Flat To Check The Flatness Of External Micrometer.
8 Michelson Interferometer with discrete components, with heavy base, dismountable mirrors and optical flat, with laser source and power supply, standard set up with the following ad on:
I already had a 4 1/4-inch optical flat for reflecting starlight upward to the refractor's objective.
The drive and optical flat are protected from the elements by a 4-by-6-foot weather-stripped cover.
1 Optical Flat, Grade 0-2om Size-Dia/Thickness-45mm/12mm & 60mm/15mm (Set of two) 01 Set