Temperature variation of ADP birefringence
Abstract
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.
- Publication:
-
Applied Optics
- Pub Date:
- June 1987
- DOI:
- 10.1364/AO.26.002057
- Bibcode:
- 1987ApOpt..26.2057H
- Keywords:
-
- Ammonium Phosphates;
- Birefringence;
- Crystal Optics;
- Optical Filters;
- Temperature Effects;
- Bandpass Filters;
- Thermal Expansion;
- Optics;
- BIREFRINGENCE;
- CRYSTALS;
- FILTERS;
- TEMPERATURE