Linear Variable Long-Wave-Pass Filter

The coating thickness varies along the filter, so the long-wave-pass cut-off wavelength changes gradually across its length. Commonly used to cut off higher-order grating diffraction, placed in front of the CCD of a fibre-optic spectrometer as a continuously variable order-sorting filter. The quartz substrate is coated by ion sputtering for minimum autofluorescence and a high laser damage threshold.

Specification

Parameter	Value
Standard size	41.4 mm × 9.5 mm × 1 mm
Substrate	Quartz
Coating process	Ion sputtering
Typical use	Continuously variable order-sorting filter in front of the line-scan detector (CCD) of a fibre-optic spectrometer

Technical FAQ

Configuration questions for Linear Variable Long-Wave-Pass Filter

What is the Linear Variable Long-Wave-Pass Filter made from?

Substrate: Quartz · Coating process: Ion sputtering. Substrate and coating decide thermal behaviour and cleaning method as much as optical performance. Confirm both before the optic enters a high-average-power or vacuum path.

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