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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