Concentration-dependent optical gain characteristics of Coumarin 485, Coumarin 440 and Rhodamine B

Mohan, Devendra; Taneja, Latesh; Gaur, Arun; Sharma, Ashwani; Singh, Randhir

doi:10.1016/0022-2313(91)90027-s

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Cited by 16 publications

(5 citation statements)

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“…The dye concentration was always less than 10™5 M to avoid dye aggregation. 22 Since the atmospheric oxygen quenches to some extent the Si excited state of these dyes,9 samples were desgassed by bubbling argon during 10 min.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-bonding effect on the photophysical properties of 7-aminocoumarin derivatives

Arbeloa¹,

Arbeloa²,

Tapia³

et al. 1993

J. Phys. Chem.

174

189

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Section: Introductionmentioning

confidence: 99%

Hydrogen-bonding effect on the photophysical properties of 7-aminocoumarin derivatives

Arbeloa¹,

Arbeloa²,

Tapia³

et al. 1993

J. Phys. Chem.

174

189

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“…Some researchers had successfully applied the treatment of Silfvast et al 9,10) developed for metal vapor lasers to the dye ASE. From their work we obtain…”

Section: Resultsmentioning

confidence: 99%

“…[3][4][5][6] This was confirmed by numerous other researchers. [7][8][9] Our investigation in this field gives a new insight into the excited state behaviour of these dye molecules.…”

Section: Introductionmentioning

confidence: 99%

Evidence of Superexciplex in Dye Molecules

Masilamani

Aldwayyan

2002

Jpn. J. Appl. Phys.

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The excited state behavior of dye molecules under intense pulsed laser excitation appears to differ from that under low-power cw Xenon lamp excitation. In the latter case molecules absorb photons (from the lamp), go to the excited state and produce normal fluorescence. This is a one photon-one molecule process. But in the former case, two excited dye molecules combine together to form 'superexciplex' and produce fluorescence and also amplified spontaneous emission (ASE) under intense, sharp, laser pulse excitation. This paper gives sufficient evidence verifying the existence of this new molecular species.

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“…On the other hand, the decrease in the peak gain value at higher concentrations can be attributed to the excited state absorption (ESA). Hence the high solute concentration can result in strong competition in the dye medium [16]. …”

Section: Resultsmentioning

confidence: 99%