Observation of Phase Relaxation in Spin Superposition by Polarization- and Time-Resolved Pump and Probe Measurements

2018 ◽  
Author(s):  
H. Muramatsu ◽  
T. Ito ◽  
H. Gotoh ◽  
M. Ichida ◽  
H. Ando
Keyword(s):  
Phase Relaxation ◽  
Time Resolved ◽  
Pump And Probe ◽  
Probe Measurements

Tunable Optical Gain from Soluble Thiophene-Based Oligomers

2001 ◽  
Vol 665 ◽  
Author(s):  
M. Anni ◽  
G. Gigli ◽  
M. Zavelani-Rossi ◽  
C. Gadermaier ◽  
G. Lanzani ◽  
...  
Keyword(s):  
Cross Section ◽  
Optical Gain ◽  
Visible Range ◽  
High Solubility ◽  
Relaxation Dynamic ◽  
Time Resolved ◽  
Pump And Probe ◽  
Gain Cross Section ◽  
Probe Measurements ◽  
Photoluminescence Efficiency

ABSTRACTTunable optical gain is demonstrated, through pump and probe measurements, in spin coated neat films of soluble S,S-dioxide oligothiophenes with different functionalization pattern. The molecular functionalization with alkyl and aryl groups allows us to obtain photoluminescence efficiency up to 70%, good chemical stability, high solubility and tunable gain along the visible range from 470 nm to 660 nm. The gain cross section is up to 9*10-18 cm2. The gain relaxation dynamic is studied through time resolved pump and probe measurements. A comparison with some of the best organic materials for laser application is presented. From these results we conclude that thienyl-S,S-dioxide oligothiophenes are interesting materials for applications to organic lasers and amplifiers.

Pump-Probe Measurements Using Silicon Nanocrystal Waveguides

2003 ◽  
Vol 770 ◽  
Author(s):  
Nathanael Smith ◽  
Max J. Lederer ◽  
Marek Samoc ◽  
Barry Luther-Davies ◽  
Robert G. Elliman
Keyword(s):  
Probe Beam ◽  
Time Resolution ◽  
Pump Beam ◽  
Silicon Nanocrystals ◽  
Continuous Wave ◽  
Optical Gain ◽  
Optical Pump ◽  
Time Resolved ◽  
Pump Probe ◽  
Probe Measurements

AbstractOptical pump-probe measurements were performed on planar slab waveguides containing silicon nanocrystals in an attempt to measure optical gain from photo-excited silicon nanocrystals. Two experiments were performed, one with a continuous-wave probe beam and a pulsed pump beam, giving a time resolution of approximately 25 ns, and the other with a pulsed pump and probe beam, giving a time resolution of approximately 10 ps. In both cases the intensity of the probe beam was found to be attenuated by the pump beam, with the attenuation increasing monotonically with increasing pump power. Time-resolved measurements using the first experimental arrangement showed that the probe signal recovered its initial intensity on a time scale of 45-70 μs, a value comparable to the exciton lifetime in Si nanocrystals. These data are shown to be consistent with an induced absorption process such as confined carrier absorption. No evidence for optical gain was observed.

Time-resolved curling-probe measurements of electron density in high frequency pulsed DC discharges

2015 ◽  
Vol 55 (1) ◽  
pp. 016101 ◽  
Author(s):  
Anil Pandey ◽  
Wataru Sakakibara ◽  
Hiroyuki Matsuoka ◽  
Keiji Nakamura ◽  
Hideo Sugai
Keyword(s):  
Electron Density ◽  
High Frequency ◽  
Time Resolved ◽  
Pulsed Dc ◽  
Probe Measurements

Optical Properties and Electronic Structures of Sexithiophene

2010 ◽  
Vol 428-429 ◽  
pp. 475-478 ◽  
Author(s):  
Bao Gai Zhai ◽  
Yuan Ming Huang
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
Ultraviolet Light ◽  
Organic Semiconductor ◽  
Electronic Structures ◽  
Light Emission ◽  
Visible Spectroscopy ◽  
Time Resolved ◽  
Pump And Probe ◽  
Green Photoluminescence

The optical properties and electronic structures of an organic semiconductor sexithiophene have been investigated with ultraviolet-visible spectroscopy, cw photospectroscopy and time-resolved photospectroscopy, respectively. Sexithiophene in dilute tetrahydrofuran solutions can absorb photons at 400 nm while it can give off strong green photoluminescence at 550 nm under the excitation of 325 nm ultraviolet light. With the assistance of calculated electronic structures and pump-and-probe characterization, our results indicate that both the optical absorption and the light emission of the sexithiophene are controlled by the p-conjugation of the oligothiophene.

UlTRAFAST LATTICE RELAXATION DYNAMICS OF EXCITON IN A QUAISI-1-D METAL-HALOGEN COMPLEX

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3965-3968
Author(s):  
ATSUSHI SUGITA ◽  
TAKASHI SAITO ◽  
TAKAYOSHI KOBAYASHI ◽  
MASAHIRO YAMASHITA
Keyword(s):  
Wave Packet ◽  
Free Exciton ◽  
Mixed Valence ◽  
Lattice Relaxation ◽  
Relaxation Dynamics ◽  
Time Resolved ◽  
Pump And Probe ◽  
Probe Spectroscopy ◽  
Electronic Ground ◽  
The Ideal

A quasi-one-dimensional halogen-bridged mixed-valence metal complex is studied by time-resolved pump and probe spectroscopy with sub-5 fs time resolution. Two kinds of oscillatory signals are observed, which are attributed to the wave packet motions both in an electronic ground state and in a self-trapped exciton (STE) state. The onset of the wave packet motion is found to be delayed by about 50 fs, comparing with the ideal wave packet in the electronic excited state. The delay reflects the thermalization process in a free exciton (FE) state and a lattice relaxation process from FE to STE states.

Femtosecond Optical Dynamics In A Poly(Para-Phenylene)-Type Ladderpolymer

1995 ◽  
Vol 413 ◽  
Author(s):  
W. Graupner ◽  
K. Petritsch ◽  
G. Leising ◽  
G. Lanzani ◽  
M. Nisoli ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Laser ◽  
Stimulated Emission ◽  
Photoinduced Absorption ◽  
Promising Candidate ◽  
Time Resolved ◽  
State Laser ◽  
Pump And Probe ◽  
Spectral Separation ◽  
High Degree

ABSTRACTTime-resolved femtosecond pump and probe experiments were conducted on films and solutions of poly (para-phenylene)-type ladder-homopolymers featuring a high degree of intrachain order. We find photobleaching, stimulated emission and photoinduced absorption. The spectral separation of stimulated emission and photoinduced absorption makes this polymer a promising candidate for a solid state laser.

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