Physics – Optics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apopt..26.2057h&link_type=abstract
Applied Optics (ISSN 0003-6935), vol. 26, June 1, 1987, p. 2057, 2058. NSF-supported research.
Physics
Optics
Ammonium Phosphates, Birefringence, Crystal Optics, Optical Filters, Temperature Effects, Bandpass Filters, Thermal Expansion
Scientific paper
As a prelude to producing a very stable, i.e., temperature-compensated, 0.1-nm passband filter made of calcite and ammonium dihydrogen phosphate (ADP) centered at 676.8 nm, measurements of the temperature variation of ADP birefringence (delta B/delta T) were undertaken at two wavelengths, 632.8 and 670.7 nm; the temperature variation of calcite birefringence were calculated from published data. The measurements were performed at 23.8 C on a high-quality piece of ADP cut to a cylindrical shape, of 72.809-mm length and 31.95-mm diameter, in such a way that the optical axis was parallel to a diameter within a few minutes of arc. Final results for delta B/delta T are 48.50 and 48.13 x 10 to the -6th at 632.8 and 670.7 nm, respectively.
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