Optical absorption and emission spectral studies of phthalocyanine molecules in DMF

2001 ◽  
Vol 05 (05) ◽  
pp. 456-459 ◽  
Author(s):  
G. A. KUMAR ◽  
J. THOMAS ◽  
N. V. UNNIKRISHNAN ◽  
V. P. N. NAMPOORI ◽  
C. P. G. VALLABHAN
Keyword(s):  
Optical Absorption ◽  
Cross Section ◽  
Emission Cross Section ◽  
Optical Gain ◽  
Spectral Studies ◽  
Dimethyl Formamide ◽  
Free Base ◽  
Dipole Strength ◽  
Spectral Parameters ◽  
Absorption And Emission

Optical absorption and emission spectral studies of various phthalocyanine ( Pc ) molecules in dimethyl formamide (DMF) solvent are reported in this paper. Measurements have been done for free base, Eu , Fe , Mn , Sm , Cu , Zn , Nd and La Pc - s . The principal optical transitions viz B and Q are identified and some of the important spectral parameters such as molar extinction coefficient (ε), absorption cross section (σa), dipole strength (q) and oscillator strength (f) are evaluated for the prominent Q-band. The measured radiative parameters viz emission cross section (σe), fluorescence bandwidth (Δλ) and optical gain (G) show wide variation among different systems. The results obtained are compared with other solid matrices such as glass and polymer.

Optical Gain in Foerster Energy Transfer Based Organic Guest-Host-Systems

2009 ◽  
Vol 1197 ◽  
Author(s):  
Torsten Rabe ◽  
Sebastian Döring ◽  
Niko Hildebrandt ◽  
Thomas Riedl ◽  
Wolfgang Kowalsky ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Cross Section ◽  
Emission Cross Section ◽  
Pump Energy ◽  
Optical Gain ◽  
Stimulated Emission ◽  
Wide Range ◽  
Förster Energy Transfer ◽  
Donor Acceptor ◽  
Stimulated Emission Cross Section

AbstractWe study the optical gain for various doping concentrations in a dye doped polymer (poly-[9,9-dioctylfluorene] with 6,6'-[2,2'-octyloxy-1,1'-binaphthyl] spacer groups (BN-PFO) doped by the stilbene dye 1,4-bis[2-[4-[N,N-di[p-tolyl]amino]phenyl]vinyl-benzene] (DPAVB)). In such a guest-host-system (GHS) the occupation of the upper laser level (dopant site) is due to Förster energy transfer (FET), which strongly depends on the donor acceptor distance and hence on the concentration of the laser dye. Therefore, the doping concentration is varied over a wide range and the gain coefficients are measured at various excitation densities to analyze the stimulated emission cross section.For the investigated GHS maximum gain coefficients up to ∼340 1/cm were found at absorbed pump energy densities of around 50 μJ/cm2. It will be shown that the stimulated emission cross section (σ = 1.8 × 10−16 cm2) is concentration independent which is quite different to a recently investigated small molecule based GHS. These effects will be discussed considering the rate and exciton diffusion constants.

scholarly journals Absorption and emission cross section of Er/sup 3+/ doped silica fibers

1991 ◽  
Vol 27 (4) ◽  
pp. 1004-1010 ◽  
Author(s):  
W.L. Barnes ◽  
R.I. Laming ◽  
E.J. Tarbox ◽  
P.R. Morkel
Keyword(s):  
Cross Section ◽  
Emission Cross Section ◽  
Absorption And Emission ◽  
Silica Fibers

scholarly journals Emission cross section and optical gain of 1.06mm laser Nd 3+ doped borate glasses

2018 ◽  
Vol 5 (7) ◽  
pp. 14998-15003 ◽  
Author(s):  
Juniastel Rajagukguk ◽  
Bornok Sinaga ◽  
Eidi Sihombing ◽  
Mitra Djamal ◽  
Jakrapong Kaewkhao
Keyword(s):  
Cross Section ◽  
Emission Cross Section ◽  
Optical Gain ◽  
Borate Glasses

scholarly journals Temperature-Dependent Stimulated Emission Cross-Section in Nd3+:YLF Crystal

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 431
Author(s):  
Giorgio Turri ◽  
Scott Webster ◽  
Michael Bass ◽  
Alessandra Toncelli
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Room Temperature ◽  
Radiative Decay ◽  
Emission Cross Section ◽  
Spectroscopic Properties ◽  
Stimulated Emission ◽  
Different Temperatures ◽  
Stimulated Emission Cross Section ◽  
Semi Empirical

Spectroscopic properties of neodymium-doped yttrium lithium fluoride were measured at different temperatures from 35 K to 350 K in specimens with 1 at% Nd3+ concentration. The absorption spectrum was measured at room temperature from 400 to 900 nm. The decay dynamics of the 4F3/2 multiplet was investigated by measuring the fluorescence lifetime as a function of the sample temperature, and the radiative decay time was derived by extrapolation to 0 K. The stimulated-emission cross-sections of the transitions from the 4F3/2 to the 4I9/2, 4I11/2, and 4I13/2 levels were obtained from the fluorescence spectrum measured at different temperatures, using the Aull–Jenssen technique. The results show consistency with most results previously published at room temperature, extending them over a broader range of temperatures. A semi-empirical formula for the magnitude of the stimulated-emission cross-section as a function of temperature in the 250 K to 350 K temperature range, is presented for the most intense transitions to the 4I11/2 and 4I13/2 levels.

Optical absorption and emission properties of Nd3+-doped fluorophosphates glass for broadband fiber amplifier applications

2003 ◽  
Author(s):  
Ju H. Choi ◽  
Frank G. Shi ◽  
Alfred A. Margaryan ◽  
Ashot Margaryan ◽  
Wytze E. van der Veer
Keyword(s):  
Optical Absorption ◽  
Fiber Amplifier ◽  
Absorption And Emission ◽  
Emission Properties

Evidence for the Photoemission Nature of Gd 4f Resonant Photoemission

1998 ◽  
Vol 524 ◽  
Author(s):  
S. R. Mishra ◽  
T. R. Cummins ◽  
W. J. Gammon ◽  
G. D. Waddill ◽  
G. Van der-Laan ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Cross Section ◽  
Photon Energy ◽  
Photoelectron Spectroscopy ◽  
Emission Cross Section ◽  
Linear Dichroism ◽  
Constructive Interference ◽  
Resonant Photoemission ◽  
Magnetic Linear Dichroism ◽  
Spectroscopy Experiment

ABSTRACTThe constructive interference between direct and indirect channels above the absorption threshold of a core level leads to a massive increase in the emission cross section leading to a phenomenon called “resonant photoemission”. Using novel magnetic linear dichroism in angular distribution photoelectron spectroscopy experiment we have tried to understand the nature of the resonant photoemission process in Gd metal. The presence of dichroism in Gd 4f photoemission intensity at a photon energy corresponding to resonant photoemission clearly demonstrates the photoemission-like nature of the resonant photoemission process.

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