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Coatings 2016, 6(1), 11; doi:10.3390/coatings6010011

Low Group Delay Dispersion Optical Coating for Broad Bandwidth High Reflection at 45° Incidence, P Polarization of Femtosecond Pulses with 900 nm Center Wavelength

1
Sandia National Laboratories, P. O. Box 5800, MS 1197, Albuquerque, NM 87185, USA
2
STFC—Science and Technology Facilities Council, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Desmond Gibson
Received: 16 December 2015 / Revised: 19 February 2016 / Accepted: 2 March 2016 / Published: 9 March 2016
(This article belongs to the Special Issue Recent Advances in Optical Coatings)
View Full-Text   |   Download PDF [4290 KB, uploaded 9 March 2016]   |  

Abstract

We describe an optical coating design suitable for broad bandwidth high reflection (BBHR) at 45° angle of incidence (AOI), P polarization (Ppol) of femtosecond (fs) laser pulses whose wavelengths range from 800 to 1000 nm. Our design process is guided by quarter-wave HR coating properties. The design must afford low group delay dispersion (GDD) for reflected light over the broad, 200 nm bandwidth in order to minimize temporal broadening of the fs pulses due to dispersive alteration of relative phases between their frequency components. The design should also be favorable to high laser-induced damage threshold (LIDT). We base the coating on TiO2/SiO2 layer pairs produced by means of e-beam evaporation with ion-assisted deposition, and use OptiLayer Thin Film Software to explore designs starting with TiO2/SiO2 layers having thicknesses in a reverse chirped arrangement. This approach led to a design with R > 99% from 800 to 1000 nm and GDD < 20 fs2 from 843 to 949 nm (45° AOI, Ppol). The design’s GDD behaves in a smooth way, suitable for GDD compensation techniques, and its electric field intensities show promise for high LIDTs. Reflectivity and GDD measurements for the initial test coating indicate good performance of the BBHR design. Subsequent coating runs with improved process calibration produced two coatings whose HR bands satisfactorily meet the design goals. For the sake of completeness, we summarize our previously reported transmission spectra and LIDT test results with 800 ps, 8 ps and 675 fs pulses for these two coatings, and present a table of the LIDT results we have for all of our TiO2/SiO2 BBHR coatings, showing the trends with test laser pulse duration from the ns to sub-ps regimes. View Full-Text
Keywords: optical coatings; broad bandwidth high reflection; low group delay dispersion; high laser-induced damage thresholds optical coatings; broad bandwidth high reflection; low group delay dispersion; high laser-induced damage thresholds
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Bellum, J.C.; Field, E.S.; Winstone, T.B.; Kletecka, D.E. Low Group Delay Dispersion Optical Coating for Broad Bandwidth High Reflection at 45° Incidence, P Polarization of Femtosecond Pulses with 900 nm Center Wavelength. Coatings 2016, 6, 11.

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