Abstract

We discuss the design, fabrication and performance of a temperature-tuned solid etalon filter for a 532 nm lidar receiver. This is the first demonstration of a bulk, ZnS (a.k.a. Cleartran) etalon filter. Cleartran provides several advantages including: full FSR tuning with a small temperature range; high thermal conductivity; high numerical aperture; and high reliability (no moving parts or piezoelectrics involved). The filter system, with a FWHM ~28 pm, was tuned at a ratee of ~15 pm/°C across the FSR of 341 pm, and provided a wavelength stability of +/- 0.8 pm.

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