Angular dependence of multilayer-reflector damage thresholds

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The damage resistance of HfO/sub 2//SiO/sub 2/ multilayer dielectric reflectors was measured as a function of angle of incidence with 351-nm XeF-laser irradiation. The laser produced nominal 10-ns pulses at a repetition rate of 35 pps. A series of reflectors designed for 0/sup 0/, 30/sup 0/, 45/sup 0/, 60/sup 0/, 75/sup 0/, and 85/sup 0/ was tested with an S-plane polarized beam. To account for variations in the separate coating depositions, some of the coating designs were tested at two angles of incidence. At large angles of incidence, we did not observe the anticipated large increases in damage thresholds predicted ... continued below

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Pages: 27

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Newnam, B.E.; Foltyn, S.R.; Gill, D.H. & Jolin, L.J. January 1, 1984.

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The damage resistance of HfO/sub 2//SiO/sub 2/ multilayer dielectric reflectors was measured as a function of angle of incidence with 351-nm XeF-laser irradiation. The laser produced nominal 10-ns pulses at a repetition rate of 35 pps. A series of reflectors designed for 0/sup 0/, 30/sup 0/, 45/sup 0/, 60/sup 0/, 75/sup 0/, and 85/sup 0/ was tested with an S-plane polarized beam. To account for variations in the separate coating depositions, some of the coating designs were tested at two angles of incidence. At large angles of incidence, we did not observe the anticipated large increases in damage thresholds predicted theoretically on the basis of spatial dilution (1/costheta) of the intensity at the reflector surface and standing-wave electric fields. For example, the threshold for a reflector designed and tested at 85/sup 0/ was only a factor of 2.5 larger than that of normal-incidence reflectors tested at 0/sup 0/. Several possible mechanisms to explain this discrepancy were considered. 11 refs.

Physical Description

Pages: 27

Notes

NTIS, PC A03/MF A01; 1.

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  • Symposium on optical materials for high power lasers, Boulder, CO, USA, 15 Oct 1984

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  • Other: DE86011265
  • Report No.: LA-UR-86-1547
  • Report No.: CONF-8410186-6
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5848098
  • Archival Resource Key: ark:/67531/metadc1098057

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  • January 1, 1984

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  • Feb. 18, 2018, 3:59 p.m.

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  • May 21, 2018, 6:58 p.m.

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Newnam, B.E.; Foltyn, S.R.; Gill, D.H. & Jolin, L.J. Angular dependence of multilayer-reflector damage thresholds, article, January 1, 1984; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1098057/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.