Excited-state absorption cross-sections in rhodamine dyes determined after molecular reorientation

Wiedmann, J.; Penzkofer, Alfons

doi:10.1007/bf02721453

Cited by 23 publications

(15 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The depicted curves are calculated by applying the rate equation system of [6] to the level system shown in Fig. 4 7 cm" 2 (see also [25]). The actual value of T A cannot be determined since for r A $>At L the energy transmission is only energy dependent (same bleaching curve for all T A^> At L ).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Saturable absorbers with concentration-dependent absorption recovery time

Penzkofer

1986

Appl. Phys. B

Self Cite

View full text Add to dashboard Cite

Abstract. The ground-state bleaching of highly concentrated rhodamine 6G solutions in methanol is studied with intense picosecond light pulses. The ground-state recovery time changes with concentration from about 3.9 ns at low concentration (10~5 mol/dm 3 ) to about 1 ps at high concentration (0.6 mol/dm 3 ). The shortening of the absorption recovery time is determined by the concentration dependent quenching of the S 1 -state population due to unbound dimers and by the intensity dependent longitudinal and transverse amplified spontaneous emission. 42.65, 42.70, 42.20 The bleaching of absorbing media by intense light pulses is a general phenomenon. The only requirement for reduction of absorption with increasing light signal is that the ground-state absorption cross-section is larger than the excited-state absorption cross-section [1][2][3][4][5]. For laser pulse durations At L short compared to the absorption recovery time z A the bleaching behavior is determined by the input pulse energy density e [6]. At a pulse energy density s s = hv L /

show abstract

Section: Resultsmentioning

confidence: 99%

“…Equation (9) applies to longitudinal and transverse amplified spontaneous emission. In the longitudinal case it is AQ = AQ\\, (1), and // = //,/<> while for the transverse case it is AQ = AQ ± , (2), and // = //,,,.. [25]. The fluorescence lifetime r F is included in Fig.…”

Section: To N 3 (T\ Z') = N(t 0 Z") X Exp [ -(F-t 0 )/T 3 (T\ Zo] Dmentioning

confidence: 99%

Saturable absorbers with concentration-dependent absorption recovery time

Penzkofer

1986

Appl. Phys. B

Self Cite

View full text Add to dashboard Cite

show abstract

“…At low input intensity the backward transmission is equal to the small signal forward transmission (ground-state absorption, no Si -state population). With [36]. N 3 and N% are determined by solution of the system of Equations 1 to 18 with the data of Table I.…”

Section: Resultsmentioning

confidence: 99%

“…The transmission behaviour depends on cr (2) and <x ex L . The transmission measurement of a delayed probe pulse at frequency v L allows the determination of a ex L [36].…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

S0-Sn Two-Photon Absorption Dynamics of Rhodamine Dyes

Sperber¹,

Weidner²,

Penzkofer³

1986

Springer Series in Chemical Physics

Self Cite

View full text Add to dashboard Cite

The intensity-dependent transmission of picosecond ruby laser pulses of different duration through methanolic and ethanolic solutions of rhodamine B and rhodamine 6G is analysed. The transmission is affected by S 0 -S" two-photon absorption, by stimulated emission at the pumplaser frequency, by amplified spontaneous emission and by excited-state absorption. Various parameters involving the two-photon absorption dynamics are determined by comparing experiments with numerical simulations.

show abstract