Study of excitation transfer in laser dye mixtures by direct measurement of fluorescence lifetime

Abstract

transfer is that of resonance transfer due to long range dipole-dipole -A "interaction.

Study of Energy Transfer in Organic Dye Pairs Using Thermal Lens Technique

“…Thus the calculated value obtained is 62Å and 65Å, respectively. The observed value agrees well with that obtained in resonance transfer for other donor-acceptor pairs reported earlier using other techniques 3,[27][28][29]. …”

“…[1][2][3][4][5] The energy transfer between similar molecules in liquid solutions results in the depolarization and self-quenching of the fluorescence of such solutions. Between unlike molecules, the corresponding transfer process results in the quenching of the fluorescence of one species and the sensitization of the fluorescence of the other.…”

Photophysical Properties and Energy Transfer Dye Laser Characteristicsof 7‐Diethylamino‐3‐Heteroaryl Coumarin in Solution

“…On the basis of these results and on the following observations, we reject the energy transfer due to Collisional Transfer(CT) and complexing for the present system: (1) The rate constant for energy transfer obtained here is greater than that obtained in the case of CT, as observed experimentally or calculated from Debye's equation. [23][24][25] (2) The absorption spectrum of the donor was found to remain unchanged on addition of acceptor ( Figure 5). (3) No new fluorescence peak was detected in the mixture to indicate any exciplex formation.…”

Characteristics of a multicolor dye laser

“…At concentrations where D 2 began to lase, its output was critically dependent on cavity alignment. Further increase of output power of D 2 at high concentrations is either due to a direct energy transfer by fluorescence reabsorption, by a resonant energy transfer due to a longrange dipole-dipole interaction [4] or, in some cases (Coumarin 102 + Rhodamine 6G), due to direct pumping of the second species by the pump source. spectra of both components closely overlap.…”

“…The subject has been treated in a number of papers for flashlamp pumping, as well as for nitrogen laser pumping [1][2][3][4][5][6][7][8] and it is well known that fluorescence conversion is commonly used, in commercial systems, to pump dyes which do not conveniently absorb at the wavelength emitted by the pumping source.…”