FEMTOSECOND SPECTROSCOPY OF STIMULATED-EMISSION FROM HIGHLY EXCITED DYE MOLECULES

被引:38
作者
LAERMER, F
ISRAEL, W
ELSAESSER, T
机构
[1] Physik Department E 11 der Technischen Universität München, München
关键词
D O I
10.1364/JOSAB.7.001604
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
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 ˜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. © 1990 Optical Society of America.
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页码:1604 / 1609
页数:6
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