Polaron dynamics in lithium niobate upon femtosecond pulse irradiation: Influence of magnesium doping and stoichiometry control

Journal Article · Wed Apr 15 04:00:00 EDT 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3095763· OSTI ID:21356094

Sasamoto, Satoru ^[1]; Hirohashi, Junji ^[2]; Ashihara, Satoshi ^[1]

---

1. Department of Applied Physics, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588 (Japan)
2. OXIDE Corporation, 1747-1, Maginohara, Mukawa, Hokuto, Yamanashi 408-0302 (Japan)

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

• OSTI ID: 21356094
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 105; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
CHALCOGENIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DOPED MATERIALS
IRRADIATION
LITHIUM COMPOUNDS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
NIOBATES
NIOBIUM COMPOUNDS
NONLINEAR PROBLEMS
OXIDES
OXYGEN COMPOUNDS
POLARONS
PULSED IRRADIATION
PULSES
QUASI PARTICLES
REFRACTORY METAL COMPOUNDS
RELAXATION
SORPTION
STOICHIOMETRY
TRANSITION ELEMENT COMPOUNDS