A double half-wave filter, whose center wavelength is 600nm and consists of nineteen layers of zinc sulphide and magnesium fluoride, was fabricated with an improved crystal film thickness monitor. With a little corrected monitored values of the change in oscillation period of the crystal, a satisfactory double-peaked spectral characteristic of the filter was obtained. The separation of the two transmission peaks was-16.5nm. The peak transmittance was 79% including the reflection loss on the rear surface of the filter.
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