Stimulated emission cross-sections in fluorescent dye solutions: gain spectra and excited-state lifetimes of Nile blue A and oxazine 720

1992 ◽  
Vol 88 (8) ◽  
pp. 1101 ◽  
Author(s):  
Andras Grofcsik ◽  
W. Jeremy Jones
Keyword(s):  
Excited State ◽  
Cross Sections ◽  
Nile Blue ◽  
Fluorescent Dye ◽  
Stimulated Emission ◽  
Nile Blue A ◽  
Gain Spectra ◽  
Excited State Lifetimes ◽  
Dye Solutions

Excited-State-Absorption Cross Sections and Amplifier Modeling in the 1300-nm Region for Nd-Doped Glasses

1991 ◽  
Vol 244 ◽  
Author(s):  
S. Zemon ◽  
B. Pedersen ◽  
G. Lambert ◽  
W. J. Miniscalco ◽  
B. T. Hall ◽  
...  
Keyword(s):  
Excited State ◽  
Cross Sections ◽  
Excited State Absorption ◽  
Fiber Amplifier ◽  
Stimulated Emission ◽  
Amplifier Model ◽  
Important Region ◽  
Host Materials ◽  
Doped Glasses ◽  
The Cost

ABSTRACTThe performance of Nd3+-doped fiber amplifiers is limited by strong excited state absorption (ESA) of the signal, even for fluorozirconate glasses where ESA prevents the important region below 1320 nm from being used. To quantify this and explore alternative host materials, ESA and stimulated-emission cross sections have been measured for a representative group of glass compositions. These parameters have been used in an accurate, fiber-amplifier model to provide the first quantitative comparisons of performance for Nd3+-doped glasses in the 1300-nm band as a function of host. A high-fluorine fluorophosphate is predicted to extend the short-wavelength boundary of the gain spectrum to 1295 nm but only at reduced gain levels and at the cost of having lower gains at longer wavelengths than fluorozirconates. A substantial increase in small-signal gain is predicted if the amplified spontaneous emission for the 1050-nm band is suppressed.

scholarly journals Спектрально-люминесцентные свойства Yb-=SUP=-3+-=/SUP=- в SOCl-=SUB=-2-=/SUB=--GaCl-=SUB=-3-=/SUB=-

2020 ◽  
Vol 128 (10) ◽  
pp. 1441
Author(s):  
Е.А. Серёгина ◽  
А.А. Серёгин ◽  
Г.В. Тихонов
Keyword(s):  
Excited State ◽  
Cross Sections ◽  
Energy Levels ◽  
Stimulated Emission ◽  
Diode Pumping ◽  
Absorption Cross ◽  
Stark Splitting ◽  
Measured Information

The absorption, luminescence, and luminescent lifetimes of the excited state of Yb3+ in SOCl2 – GaCl3 – Yb3+ solutions were measured. Information was obtained on the Stark splitting of energy levels, absorption cross sections, and stimulated emission of Yb3+ in SOCl2 – GaCl3 – Yb3+. The possibility of creating a ytterbium laser based on inorganic liquid SOCl2 – GaCl3 – Yb3+ with diode pumping was considered.

Determination of Atomic and Molecular Excited-State Lifetimes Using an Optoelectronic Cross-Correlation Method

1982 ◽  
Vol 36 (2) ◽  
pp. 92-99 ◽  
Author(s):  
R. E. Russo ◽  
G. M. Hieftje
Keyword(s):  
Excited State ◽  
Cross Sections ◽  
Cross Correlation ◽  
Correlation Method ◽  
Correlation Technique ◽  
Atomic Fluorescence ◽  
Excited State Lifetimes ◽  
Cross Correlation Technique ◽  
Molecular Excited State

A new optoelectronic cross-correlation technique has been used to measure excited-state lifetimes of several organic fluorophores in solution and of sodium atoms in both air-acetylene and methane-air flames. Capable of time resolution in the picosecond range, the new method was validated by the excellent agreement between measured and literature values for fluorescence lifetimes of the organic species. Lifetime values for Na atoms in flames are among the most precise ever reported and agree closely with values calculated from the known flame gas composition, temperature, and the quenching cross-sections of the two dominant quenching species in the flame, N2 and CO2. From the Na excited-state lifetimes (0.72 ± 0.07 ns for air-acetylene and 0.48 ± 0.08 ns for methane-air flames), quantum efficiencies for atomic fluorescence were calculated.

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.

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