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Proceedings Paper

Transient optical absorption upon femtosecond pulse irradiation in lithium niobate crystals
Author(s): Satoshi Ashihara; Satoru Sasamoto; Junji Hirohashi
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Paper Abstract

Formation and relaxation dynamics of electron polarons in lithium niobate crystals is investigated by measuring transient absorption induced by blue femtosecond pulses. Anisotropy in absorption change distinguishes between small free polarons and small bound polarons, revealing that the dynamics is influenced by MgO-doping and stoichiometry control. In crystals doped with MgO at concentrations above threshold, small free polarons are generated within 100 fs and decay at tens of nanosecond. In the presence of antisite defects, sequential formation of polaronic states occurs: electrons initially trapped as small free polarons become trapped as small bound polarons at picosecond time scale. The results are relevant for nonlinear optical applications of pulsed or high-power lasers.

Paper Details

Date Published: 24 February 2009
PDF: 8 pages
Proc. SPIE 7197, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VIII, 719712 (24 February 2009); doi: 10.1117/12.808578
Show Author Affiliations
Satoshi Ashihara, Tokyo Univ. of Agriculture and Technology (Japan)
Japan Science And Technology Agency (Japan)
Satoru Sasamoto, Tokyo Univ. of Agriculture and Technology (Japan)
Junji Hirohashi, Oxide Corp. (Japan)


Published in SPIE Proceedings Vol. 7197:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VIII
Peter E. Powers, Editor(s)

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