Femtosecond Polarized Pump−Probe and Stimulated Emission Spectroscopy of the Isomerization Reaction of Rhodopsin

1999 ◽  
Vol 103 (14) ◽  
pp. 2202-2207 ◽  
Author(s):  
Gilad Haran ◽  
Elisabeth A. Morlino ◽  
Jens Matthes ◽  
Robert H. Callender ◽  
Robin M. Hochstrasser
Keyword(s):  
Emission Spectroscopy ◽  
Stimulated Emission ◽  
Isomerization Reaction ◽  
Pump Probe

Time-resolved stimulated emission spectroscopy in the ultrashort domain through pump–probe experiments

2007 ◽  
Vol 254 (4) ◽  
pp. 859-862 ◽  
Author(s):  
S. Orlando ◽  
A. Paladini ◽  
L. Guidoni ◽  
A. Santagata ◽  
G.P. Parisi ◽  
...  
Keyword(s):  
Emission Spectroscopy ◽  
Stimulated Emission ◽  
Time Resolved ◽  
Pump Probe

scholarly journals Excited-state dynamics of overlapped optically-allowed 1B(u)+ and optically-forbidden 1B(u)- or 3A(g)- vibronic levels of carotenoids: possible roles in the light-harvesting function.

2012 ◽  
Vol 59 (1) ◽  
Author(s):  
Yasushi Koyama ◽  
Yoshinori Kakitani ◽  
Hiroyoshi Nagae
Keyword(s):  
Internal Conversion ◽  
Selection Rule ◽  
Polar Solvent ◽  
Selective Excitation ◽  
Stimulated Emission ◽  
Quantum Beat ◽  
Pump Probe ◽  
Cross Term ◽  
Hand Pump ◽  
Probe Spectroscopy

Pump-probe spectroscopy after selective excitation of all-trans Cars (n = 9-13) in nonpolar solvent identified a symmetry selection rule of diabatic electronic mixing and diabatic internal conversion, i.e., '1B(u)(+)-to-1B(u)(-) is allowed but 1B(u)(+)-to-3A(g)(-) is forbidden'. Kerr-gate fluorescence spectroscopy showed that this selection rule breaks down, due to the symmetry degradation when the Car molecules are being excited, and, as a result, the 1B(u)(+)-to-3A(g)(-) diabatic electronic mixing and internal conversion become allowed. On the other hand, pump-probe spectroscopy after coherent excitation of the same set of Cars in polar solvent identified three stimulated-emission components (generated by the quantum-beat mechanism), consisting of the long-lived coherent cross term from the 1B(u)(+) + 1B(u)(-) or 1B(u)(+) + 3A(g)(-) diabatic pair and incoherent short-lived 1B(u)(+) and 1B(u)(-) or 3A(g)(-) split incoherent terms. The same type of stimulated-emission components were identified in Cars bound to LH2 complexes, their lifetimes being substantially shortened by the Car-to-BChl singlet-energy transfer. Each diabatic pair and its split components appeared with high intensities in the first component. The low-energy shifts of the 1B(u)(+)(0), 1B(u)(-)(0) and 3A(g)(-)(0) levels and efficient triplet generation were also found.

Erbium-Doped Barium Titanate Thin FilmWaveguides For Integrated Optical Amplifiers

2001 ◽  
Vol 688 ◽  
Author(s):  
Andrew R. Teren ◽  
Seong-Soo Kim ◽  
Seng-Tiong Ho ◽  
Bruce W. Wessels
Keyword(s):  
Optical Gain ◽  
Chemical Vapor ◽  
Stimulated Emission ◽  
Organic Chemical ◽  
Pump Probe ◽  
Factors Affecting ◽  
Luminescence Efficiency ◽  
Metal Organic ◽  
Thin Film Waveguides ◽  
Er Doped

AbstractThe factors affecting optical gain were studied for Er-doped BaTiO3 thin film waveguides. Er-doped BaTiO3 with dopant concentrations of 0.3 – 9 at.% was deposited by metal-organic chemical vapor deposition. The luminescence efficiency was maximized by optimizing the growth temperature and erbium concentration as well as by post-deposition annealing. Stimulated emission was studied using the pump-probe technique over the spectral range of 1,520-1,550 nm. A maximum differential gain of 3 dB/cm was measured at 1,540 nm in an 8 mm long, 8 μm wide ridge waveguide.

Growth and stimulated emission spectroscopy of Ca3Ga2Ge3O12Nd3+ garnet crystals

1983 ◽  
Vol 78 (2) ◽  
pp. 723-732 ◽  
Author(s):  
A. A. Kaminskii ◽  
B. V. Mill ◽  
A. V. Butashin
Keyword(s):  
Emission Spectroscopy ◽  
Stimulated Emission

Dynamics of stimulated emission in InAs quantum dot laser structures measured in pump-probe experiments

2004 ◽  
Author(s):  
Alexander I. Tartakovskii ◽  
Kristian M. Groom ◽  
Ali M. Adawi ◽  
Aristide LemaŽtre ◽  
David J. Mowbray ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Stimulated Emission ◽  
Pump Probe ◽  
Quantum Dot Laser ◽  
Inas Quantum Dot
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