Graduate Exam Abstract
Peter Langston
Ph.D. Preliminary
May 3, 2012, 2:00 pm
Foothills Campus Electronic Classroom
Advances in High Damage Threshold Ion Beam Sputtered Films for Use in the Near Infra-Red (IR)
Abstract: We have investigated the role of defects in the laser induced damage threshold (LIDT) of amorphous Sc2O3 and HfO2 thin film layers grown
using ion beam deposition. The LIDT studies were conducted in different pulse regimes, ranging from nanosecond to femtosecond pulsewidths. A
critical dependence on deposition process parameters is detailed. Early onset damage mechanisms will be discussed and results of our material studies as well as the damage performance of our films will be presented. The role of post-deposition processing in the improvement of damage threshold values will also be discussed.
Adviser: Carmen Menoni
Co-Adviser: N/A
Non-ECE Member: Azer Yalin, ME
Member 3: Jorge Rocca, ECE
Addional Members: Mario Marconi, ECE
Publications:
P. Langston, E. Krous, D. Patel, L. Emmert, A. Markosyan, B. Reagan, F.
Furch, A. Curtis, K. Wensing, R. Route, M. Fejer, W. Rudolph, J. Rocca,
and C. Menoni, “Laser damage in HfO2 and Sc2O3 mediated by oxygen
defects,” Optics Express, (manuscript submitted).
P. Langston, "Influence of oxygen pressure variations on the optical
properties of ion beam sputtered metal oxide coatings," FIO, OSA
Technical Digest (Optical Society of America, 2011), paper
JWA25.
J. Sanghera, S. Bayya, G. Villalobos, W. Kim, J. Frantz, B. Shaw, B.
Sadowski, R. Miklos, C. Baker, M. Hunt, I. Aggarwal, F. Kung, D.
Reicher, S. Peplinski, A. Ogloza, P. Langston, C. Lamar, P. Varmette, M.
Dubinskiy, L. DeSandre, “Transparent ceramics for high-energy laser
systems,” Optical materials, Vol. 33, Issue 3, pg. 511-518,
2011.
P. Langston, D. Patel, A. Markosyan, E. Krous, D. Nguyen, L. Emmert, W.
Rudolph, R. Route, M. Fejer, C. Menoni, “Effect of Annealing on the
Optical Properties of HfO2,” oral and poster presentation, OSA Optical
Interference Coating Conference (2010).
E. Krous, D. Patel, P. Langston, C. Menoni, A. Markosyan, R. Route, M.
Fejerm, “Scandium oxide thin ?lms deposited by dual ion beam sputtering
for high-power laser applications,” Optical Interference Coating
Conference (2010)
P. Langston, D. Patel, A. Markosyan, E. Krous, D. Nguyen, L. Emmert, W.
Rudolph, R. Route, M. Fejer, M. Shinn, and C. Menoni, "Modifications in
the Optical Properties of Thin Film Oxides with Annealing," FIO, OSA
Technical Digest (CD) (Optical Society of America, 2009), paper FThS7.
E. Krous, P. Langston, D. Patel, F. Furch, B. Reagan, J. Rocca, C.
Menoni, A. Markosyan, R. Route, M. Fejer, L. Emmert, D. Nguyen, W.
Rudolph, “Growth and characterization of transition metal oxide thin
films by dual ion beam sputtering,” American Physical Society, Fall
Meeting of the Four Corners Section of the APS
(2009).
E. Krous, D. Patel, A. Markosyan, D. Nguyen, L. Emmert, P. Langston, R.
Route, M. Fejer, W. Rudolph, M. Shinn, and C. Menoni, “Optimization of
scandia thin films for high power laser coating applications,”
Laser-Induced Damage in Optical Materials: 2009, G.J. Exarhos, V.E.
Gruzdev, D. Ristau, M.J. Soileau, and C.J. Stolz, eds., SPIE, 2009, p.
750407.
C. Menoni, E. Krous, P. Langston, D. Patel, L. Emmert, D. Nguyen, W.
Rudolph, A. Markosyan, R. Route, M. Fejer, M. Shinn, “Impact of
annealing on the optical properties of thin film oxides”, Directed
Energy Society Meeting, San Antonio Texas, Nov. 2009.
P. Langston, D. Patel, A. Markosyan, E. M. Krous, B. Langdon, R. Route,
M. Fejer and C. Menoni, “SiO2/HfO2 multilayers: impact of process
parameters and stack geometry on the optical and structural properties,”
Frontiers in Optics, OSA Technical Digest (CD) (Optical Society of
America, 2008), paper JSuA27.
C. Menoni, D. Patel, A. Markosian, E. Krous, P. Langston, B. Langdon, M.
Mero, L. Emmert, R. Route, M. Fejer, M. Shinn and W. Rudolph, “Impact
of process parameters and stack geometry on the optical and structural
properties of SiO2/HfO2 multilayers” Directed Energy Professional
Society Annual Meeting, Honolulu, HW, Nov. 17-21, 2008.
B. Langdon, D. Patel, E. Krous, P. Langston, C. Menoni, M. Shinn,
“Electron spin resonance and x-ray photo electron spectroscopy
investigation of ion beam sputtered HfO2 and SiO2 thin films”,
Laser-Induced Damage in Optical Materials: 2008, Gregory J. Exarhos;
Detlev Ristau; M. J. Soileau; Christopher J. Stolz, Editors, Proc. SPIE
vol. 7132, 71320M.
Kuo-Jui Hsiao, J. Blanco Rodriguez, J. Jensen, D. Patel, D. Alessi, E.
Granados Mateo, Y. Wang, J. Rocca, C. Menoni, P. Langston and A. Ogloza,
“Influence of process conditions on the optical properties HfO2/SiO2
thin films for high power laser coatings,” Frontiers in Optics, San
Jose, Sept. 16-20, 2007.
Peter Langston, A, Ogloza, J. Pentony, S. Lundin, D. Oconnor, “High
Fluence Effects on Modern Optical Coatings,” DEPS Damage Symposium
November 2005, Kauai, HI.
Lewis DeSandre, Peter Langston, Joni Pentony, Denton Marrs, Albert
Ogloza, “Characterization of Turbulent Atmospheric Induced Optical
Distortion by Passive Phase Diversity Techniques,” SPIE 2001 Aerosense,
April 2001, Orlando, FL.
L.F Desandre, A.A Ogloza, C.D. Marrs, J.M. Pentony, P. Langston,
“Characterization of Atmospheric Induced Optical Distortions by the
Transport of Intensity Equation,” SPIE Aerosense, April 2001, Orlando,
FL.
Program of Study:
CHEM577
ECE503
ECE504
ECE506
ECE546
ECE604
ECE641
CHEM579