Population kinetics of the fluorescing MNa center state in CaF2 upon fs laser excitation at 392 nm and 262 nm

C. Karras; C. Mühlig; W. Paa; H. Stafast; W. Triebel; T. Zeuner

doi:10.1117/12.867256

29 November 2010 Population kinetics of the fluorescing M_Na center state in CaF₂ upon fs laser excitation at 392 nm and 262 nm

C. Karras, C. Mühlig, W. Paa, H. Stafast, W. Triebel, T. Zeuner

Author Affiliations +

Proceedings Volume 7842, Laser-Induced Damage in Optical Materials: 2010; 78421R (2010) https://doi.org/10.1117/12.867256
Event: Laser Damage Symposium XLII: Annual Symposium on Optical Materials for High Power Lasers, 2010, Boulder, Colorado, United States

Abstract

We report on femtosecond (fs) laser experiments yielding the time constants τ_rel for the non-radiative relaxation from optically excited high energy M_Na** states to the fluorescent M_Na* state in CaF₂ samples. The values obtained with the third and second harmonics of the fs laser amount to τ_rel (262 nm) = (3.0 ± 0.3) ps and to τ_rel (392 nm) = (1.0 ± 0.1) ps for the two selected M_Na** states at 4.7 eV (262 nm) and 3.2 eV (392 nm) excitation energy, respectively. These time constants were derived from depletion processes of the fluorescence at 740 nm (M_Na* state) using fs laser pulses of the NIR fundamental wavelength (785 nm) at variable delay relative to the UV fs laser pulses. In addition, photobleaching of the MNa centers upon UV fs laser irradiation is observed and simulated by assuming a constant fraction of MNa bleaching per pulse for a given laser fluence. This fraction ranges from 0.14% per pulse at 392 nm and 0.28mJ/cm² to about 1% per pulse at about 6 mJ/cm².

Citation Download Citation

C. Karras, C. Mühlig, W. Paa, H. Stafast, W. Triebel, and T. Zeuner "Population kinetics of the fluorescing M_Na center state in CaF₂ upon fs laser excitation at 392 nm and 262 nm", Proc. SPIE 7842, Laser-Induced Damage in Optical Materials: 2010, 78421R (29 November 2010); https://doi.org/10.1117/12.867256

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available