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Title: Analysis of laser damage tests on coatings designed for broad bandwidth high reflection of femtosecond pulses

Journal Article · · Optical Engineering
 [1];  [2];  [3];  [3];  [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. STFC Rutherford Appleton Lab., Didcot, (United Kingdom)
  3. Centre d'Etudes Scientifiques et Techniques d'Aquitaine, Le Barp Cedex (France)
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We designed an optical coating based on TiO2/SiO2 layer pairs for broad bandwidth high reflection (BBHR) at 45-deg angle of incidence (AOI), P polarization of femtosecond (fs) laser pulses of 900-nm center wavelength, and produced the coatings in Sandia’s large optics coater by reactive, ion-assisted e-beam evaporation. This paper reports on laser-induced damage threshold (LIDT) tests of these coatings. The broad HR bands of BBHR coatings pose challenges to LIDT tests. An ideal test would be in a vacuum environment appropriate to a high energy, fs-pulse, petawatt-class laser, with pulses identical to its fs pulses. Short of this would be tests over portions of the HR band using nanosecond or sub-picosecond pulses produced by tunable lasers. Such tests could, e.g., sample 10-nm-wide wavelength intervals with center wavelengths tunable over the broad HR band. Alternatively, the coating’s HR band could be adjusted by means of wavelength shifts due to changing the AOI of the LIDT tests or due to the coating absorbing moisture under ambient conditions. In conclusion, we had LIDT tests performed on the BBHR coatings at selected AOIs to gain insight into their laser damage properties and analyze how the results of the different LIDT tests compare.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1333613
Report Number(s):
SAND--2016-7949J; 646654
Journal Information:
Optical Engineering, Journal Name: Optical Engineering Journal Issue: 1 Vol. 56; ISSN 0091-3286
Publisher:
SPIECopyright Statement
Country of Publication:
United States
Language:
English

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Ultrafast multipulse damage threshold of femtosecond high reflectors journal January 2018

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36 MATERIALS SCIENCE