Cavity ringdown measurements of high-reflection mirrors at 1. 06. mu. m
Conference
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OSTI ID:6506620
A 1064-nm-cavity-ringdown reflectometer was used to study reflectances of a variety of high reflectance dielectric coatings and silver mirrors. Reflectances of the dielectric coatings were measured at near-normal angle of incidence. The multilayer dielectric high reflectors included ZrO/sub 2/, HfO/sub 2/, SiN/sub 4/, TiO/sub 2/, and Al/sub 2/O/sub 3/, which were used in combination with SiO/sub 2/ in conventional quarter-wave designs. Reflectors from more than a dozen vendors were surveyed in this effort. Metallic reflectors investigated were silver and silver protected with a thin (10 /angstrom/) alumina overcoat. These reflectors were tested at both normal incidence and at high (grazing) angles. The results of these studies show that, although high reflectances (R > 0.9990) can be achieved for 1064-nm-multilayer dielectrics, the majority are not of this caliber. Reflectances for dielectric designs ranged from 0.96 to >0.9990. The silver mirrors exhibited predictable behavior with reflectances of 0.992 at near-normal angle. 1 ref., 4 figs., 4 tabs.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6506620
- Report Number(s):
- LA-UR-89-293; CONF-8810296-1; ON: DE89006512
- Country of Publication:
- United States
- Language:
- English
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