High-resolution amplified spontaneous emission (ASE) gain spectroscopy to study excited state complexation

1991 ◽  
Vol 69 (12) ◽  
pp. 2142-2149 ◽  
Author(s):  
R. W. Yip ◽  
Y-X. Wen
Keyword(s):  
Excited State ◽  
Steady State ◽  
High Resolution ◽  
Key Words ◽  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
Frequency Resolution ◽  
Laser Dye ◽  
Weakly Bound ◽  
Laser Gain

Weakly bound excited state complexes involving 7-diethylamino-4-methylcoumarin have been studied by ASE gain spectroscopy to explore the applicability of the method for studying excited state complexation. Comparative steady state spectrofluorometric and ASE gain measurements showed that ASE gain measurements are capable of giving information on excited state complexation of the laser dye but with greater ease and frequency resolution. Key words: excited state complex, amplified spontaneous emission, laser gain, ASE gain spectroscopy

Origin of the dual-band laser emission from 7-diethylamino-4-methylcoumarin (C1) in solution: effect of hydrogen-bonding interaction by hydroxylic molecules

1991 ◽  
Vol 69 (9) ◽  
pp. 1413-1417 ◽  
Author(s):  
R. W. Yip ◽  
Y. X. Wen
Keyword(s):  
Hydrogen Bonding ◽  
Excited State ◽  
Spontaneous Emission ◽  
Equilibrium Concentration ◽  
Amplified Spontaneous Emission ◽  
Butyl Alcohol ◽  
Dual Band ◽  
Quasi Equilibrium ◽  
Laser Gain ◽  
Fluorescence Measurements

Ultraviolet absorption measurements on 7-diethylamino-4-methylcoumarin (Cl) and its rigid analogue C102 in which the 7-amino group is structurally prevented from twisting in n-butyl acetate (nBuOAc) solutions containing submolar concentrations of n-butyl alcohol showed weak 2:1 alcohol:dye complexation. These results contrast with those from fluorescence measurements which revealed a 1:1 alcohol:dye excited state complex for the Cl dye. These results together with N2 laser excited amplified spontaneous emission (ASE), and laser gain measurements on Cl and C102 in nBuOAc with alcohol or acetonitrile co-solvent show that dual ASE from Cl originates from a quasi-equilibrium concentration of hydrogen-bonded or acetonitrile-solvated excited state complex. The results are inconsistent with a TICT-nBuOAc exciplex for Cl in nBuOAc. The laser gain of the twin ASE peaks at 420 nm and 455 nm from Cl can be tuned by adding a small quantity of hydroxylic co-solvent to dried nBuOAc. ASE was found to be a selective probe for a H-bonded Cl complex whose fluorescence is normally obscured by that from the "free" dye. Key words: aminocoumarins, dual amplified spontaneous emission, excited state hydrogen-bonding complex, laser gain.

scholarly journals Spectral and ASE Properties of 1-(4-Methylsulfonyl Phenyl)-3-(4-N, N Dimethyl Amino Phenyl)-2-Propen-1-One (MSPPP)

2021 ◽  
Author(s):  
Mohana University ◽  
Abdelrahman A. Elbadawi ◽  
K.H. Ibnaouf
Keyword(s):  
Quantum Yield ◽  
Spontaneous Emission ◽  
Fluorescence Spectra ◽  
Laser Excitation ◽  
Stokes Shift ◽  
Amplified Spontaneous Emission ◽  
Wavelength Band ◽  
Laser Dye ◽  
Energy Band Gap ◽  
Pulse Laser Excitation

Abstract This work demonstrates the spectral and amplified spontaneous emission (ASE) properties of a new chalcone laser dye material of 1-(4-methylsulfonyl phenyl)-3-(4-N, N dimethyl amino phenyl)-2-propen-1-one (MSPPP). The absorption, fluorescence, Stokes’ shift and quantum yield were obtained using different organic solvents. The energy band gap was calculated and compared with that of 3-[4-(dimethylamino) phenyl]-1-phenyl-(2E)-propen- 1-one (DAPPP). These include absorption, fluorescence, stokes shift, and amplified spontaneous emission (ASE). The absorption spectra of MSPPP showed a wavelength band in the range 403–427 nm, whereas the fluorescence spectra exhibited a band at 472–533 nm. ASE was observed under pump pulse laser excitation, and the wavelengths were attuned from 511 to 548 nm.

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