Highly photostable laser solution and solid-state media based on mixed pyrromethene and coumarin

The photodegradation of pyrromethene 567 and pyrromethene 597 by pyrromethene 546

“…The observed decrease in PM567 and PM597 photostability upon PM546 addition is in marked contrast to the reported photostability enhancement upon C540 addition [8]. In the present experiment accelerated photodegradation predominates in the competition between enhanced dye photostability and accelerated dye photodegradation upon PM546 addition.…”

“…Ahmad et al reported the photostability improvement of PM567/ethanol solutions and polymer dispersed PM567 by the addition of Coumarin 540 (C540) [8]. On the other hand, Jones reported fluorescence quenching of pyrromethene dye acetonitrile solutions by electron acceptors such as methyl viologen or pyromellitic dianhydride via electron transfer [9].…”

Efficient lasing action from Rhodamine-110 (Rh-110) impregnated sol–gel silica samples prepared by dip method

“…In the present study, the pumping energy per pulse is 400 mJ with pulse duration of 4 ns giving rise to fluence of nearly 8 mJ/cm 2 and density power 2000 kW/cm 2 . This fluence value of 8 mJ/cm 2 is very small compared to 180 mJ/cm 2 and 1 J/cm 2 reported in the literature [48,62] and this does not seem to be the reason for such fast degradation of the dye molecules. However, the power density of 2000 kW/cm 2 in the present study is comparable to our earlier value of nearly 2142 kW/cm 2 (in case of Rh-6G/PMMA film with half-life 810 pulses) and this may be the reason with small contribution.…”

Distributed-Feedback Solid-State Polymeric-Dye Lasers Based on Excitation-Energy Transfer

“…Solid-state dye lasers are nontoxic and maintenance-free, compared with liquid dye lasers [3][4][5]. Hence, they have been preferably used in solar cells, atmospheric and underwater sensing, isotope separation, and spectroscopy [6,7].…”