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Excited-state absorption in red perylimide dye in solution

✍ Scribed by R. Gvishi; R. Reisfeld; Z. Burshtein

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 304 KB
Volume: 212
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)87229-v

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✦ Synopsis

We measured the gain spectrum of red perylimide dye (RPD) dissolved in cyclohexane. A frequency-doubled Nd:YAG laser at 1 Hz repetition rate was used for pumping, A probe pulsed laser beam was obtained using a series of laser-grade dyes. Gain is observed in the region 550460 nm and loss in the region 660-730 nm. The loss is interpreted as absorption from the first singlet excited state Sr to a higher singlet excited state S.. The cross section uLn is calculated as 1.3 X IOeL6 cm*/molecule in the region 550-600 nm and 5 x JO-" cm2/molecule in the region 650-7 10 nm. This process competes with the stimulated emission to a lower state, which establishes the mechanism for the dye-laser action.

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