Optical Filter RFQ Checklist

0 of 26 checked

Passband

Center wavelength With its tolerance, at the stated angle of incidence and temperature.A CWL without an angle and a temperature can be met on paper and missed in the instrument.
FWHM With its tolerance and the level it is measured at (half of peak transmission).
Transmission Peak or average, at which wavelength or over which band, measured collimated.Average over the FWHM is lower than the peak; the request states which one is specified.
Passband shape Flat-top or standard, and the allowed ripple if the shape matters to the measurement.

Blocking

Optical density The OD and the full wavelength range it applies over.Compute it from the power at the blocked wavelength and the power the receiver can accept: OD = log10(P_in / P_allowed).
Exclusion zone The band around the passband where the blocking spec does not apply, stated in nm.
Verification How the OD is measured and the instrument's dynamic range.A reading at the instrument's floor shows the OD is at least that value, not what it is.
Number of elements And how reflections between them are handled: tilt, absorber or baffles.

Angle and polarization

Angle of incidence The working AOI and its tolerance.
Field of view Or the f-number at the filter, so the cone of angles is known.A converging beam shifts the passband toward shorter wavelengths and broadens it.
Polarization The state at the filter, and whether each spec applies to s, p or the average.
Effective index Or measured curves at the working angle requested from the supplier.

Beam geometry

Beam at the filter Collimated, or the f-number at the filter.
Beam diameter And its position on the clear aperture.
Power Power and power density at the filter, pulsed or continuous, with pulse width and repetition rate.

Mechanics and surfaces

Size Minimum clear aperture, diameter and thickness, each with a tolerance.
Wedge Or parallelism, as a maximum in arcmin or arcsec.
Surface quality Scratch-dig over the clear aperture.
Transmitted wavefront At 633 nm, over the clear aperture, if the filter sits in an imaging path.
Mount and orientation Mount, orientation arrow and which face is coated or faces the source.

Environment, durability and documents

Temperature Operating and storage ranges.
Temperature coefficient CWL shift per kelvin requested, measured on the coating.
Durability Humidity and temperature cycling by a named test method, with pass criteria.
Measured curves Supplied with each lot, or with each unit if the tolerance is tight.
Reports and models Test report, STEP model and outline drawing requested.
Revision Revision letter and date on the datasheet the order refers to.

Notes

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Build the request itself with Spec your filter, which computes the required OD, the cone shift and the thermal window, or test a supplier datasheet against these points with Datasheet check.

Optical filter RFQ checklist