Femtosecond spectroscopy of stimulated emission from highly excited dye molecules
- Physik Department E 11 der Technischen Universitaet Muenchen, D-8000 Muenchen 2 (Federal Republic of Germany)
Intense femtosecond pulses in ultaviolet and visible wavelengths are generated in an excimer-laser-pumped amplifier system with input pulses originating from a colliding-pulse mode-locked dye laser. The relaxation of high-lying singlet states in laser dyes is studied after ultraviolet excitation. Two time scales of relaxation are observed: (i) The intramolecular redistribution of energy occurs in rhodamine dyes with short time constants of {similar to}200 fsec. (ii) The subsequent cooling of the vibrationally hot molecules on the picosecond time scale is monitored through the temperature-dependent broadening of the emission spectrum. Theoretical calculations of the emission spectrum of the hot molecules account well for the experimental results.
- OSTI ID:
- 6516686
- Journal Information:
- Journal of the Optical Society of America, Part B: Optical Physics; (USA), Journal Name: Journal of the Optical Society of America, Part B: Optical Physics; (USA) Vol. 7:8; ISSN JOBPD; ISSN 0740-3224
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
426002* -- Engineering-- Lasers & Masers-- (1990-)
AMINES
CARBOXYLIC ACIDS
DYE LASERS
DYES
ELECTROMAGNETIC RADIATION
EMISSION
EMISSION SPECTRA
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
LASERS
LINE BROADENING
LIQUID LASERS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PULSES
RADIATIONS
REAGENTS
RHODAMINES
SPECTRA
STIMULATED EMISSION
TEMPERATURE DEPENDENCE
ULTRAVIOLET RADIATION
VISIBLE RADIATION