Study of solvent effect in laser emission from Coumarin 540 dye solution

Abstract

The results of a brief investigation of the amplified spontaneous emission and lasing characteristics of Coumarin 540 dye in as many as ten different solvents are reported. It has been found that C 540 dye solutions contained within a rectangular quartz cuvette give laser emission with well resolved equally spaced modes when pumped with a 476 nm beam. The modes were found to originate from the subcavities formed by the plane-parallel walls of the cuvette containing the high-gain medium. While the quantum yield remains a decisive factor, a clear correlation between the total width of the emission spectra and the refractive indices of the solvents of the respective samples has been demonstrated. The well-resolved mode structure exhibited by the emission spectra gives clear evidence of the lasing action taking place in the gain medium, and the number of modes enables us to compare the gain of the media in different samples. A detailed discussion of the solvent effect in the lasing characteristics of C540 in different solutions is given.

Ultralow-threshold multiphoton-pumped lasing from colloidal nanoplatelets in solution

“…At larger pump intensities, well-resolved, equally spaced resonant modes were observed. A similar periodic pattern of lasing spectra was previously observed from a solution of Coumarin dye in a transversely excited cuvette 33 . Such spectral modulation was attributed to a Fabry–Pérot cavity formed by the front and back windows of the quartz cuvette.…”

“…Such spectral modulation was attributed to a Fabry–Pérot cavity formed by the front and back windows of the quartz cuvette. The wavelength spacing of two adjacent maxima is determined via the following relation 33 :…”

Organic Solvent Effects in Biomass Conversion Reactions

“…Solvent effects have been widely observed in different areas of chemistry such as photochemistry, biochemistry, and catalysis . Of these studies most discuss static effects, which often play a greater role in most chemical reactions compared to dynamic effects .…”

“…It is usually assumed that f is related linearly to the viscosity of the solvent, the rate becomes inverselyp roportional to the solvent's viscosity. [151] Solvent effectsh ave been widely observed in different areas of chemistry such as photochemistry, [146,[152][153][154] biochemistry, [147,[155][156][157][158][159] and catalysis. [160][161][162][163] Of these studies most discuss static effects, which often play ag reater role in mostc hemical reactions compared to dynamic effects.…”

Deactivation of 6-Aminocoumarin Intramolecular Charge Transfer Excited State through Hydrogen Bonding

“…In the 6AC molecule, an amino group is substituted at position 6 of the 1,2-benzopyrone moiety. Therefore, in contrast to 7-aminocoumarins (often used as fluorescence probes [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ], chemosensors [ 23 , 24 , 25 ] in biological and biomedical sciences [ 26 , 27 , 28 , 29 ] and in dye lasers [ 30 , 31 , 32 , 33 ]), the donor and acceptor groups are arranged along the same molecular axis and no other substituent groups (e.g., –CH 3 , –CF 3 ) are present in the molecule. In general, aromatic carbonyl compounds with amino group, such as aminocoumarins, can form intermolecular hydrogen bonds with solvents at different sites both in the ground and excited states [ 3 , 4 , 5 , 34 , 35 , 36 , 37 , 38 ].…”