Effects of excited-state absorption and stimulated emission in UV dyes on the shortening of laser pulses interacting with saturable absorbers

1986 ◽  
Vol 18 (2) ◽  
pp. 137-144 ◽  
Author(s):  
Ch. G. Christov ◽  
I. V. Tomov
Keyword(s):  
Excited State ◽  
Excited State Absorption ◽  
Laser Pulses ◽  
Stimulated Emission ◽  
Saturable Absorbers

Excited state absorption and stimulated emission of Nd 3+ in crystals III: LaSc 3 (BO 3 ) 4 , CaWO 4 , and YLiF 4

1999 ◽  
Vol 68 (1) ◽  
pp. 67-72 ◽  
Author(s):  
L. Fornasiero ◽  
T. Kellner ◽  
S. Kück ◽  
J.P. Meyn ◽  
P.E.-A. Möbert ◽  
...  
Keyword(s):  
Excited State ◽  
Excited State Absorption ◽  
Stimulated Emission

Stimulated emission and excited state absorption in neodymium-doped CaNb2O6 single crystal fibers grown by the LHPG technique

2005 ◽  
Vol 80 (4-5) ◽  
pp. 497-502 ◽  
Author(s):  
A. S. S. De Camargo ◽  
R. Almeida Silva ◽  
J. P. Andreeta ◽  
L. A. O. Nunes
Keyword(s):  
Excited State ◽  
Single Crystal ◽  
Excited State Absorption ◽  
Stimulated Emission ◽  
Crystal Fibers

Infrared saturable absorbers. Part II: Intensity dependent transmission of SF6 at 936.8 wave numbers

1977 ◽  
Vol 55 (18) ◽  
pp. 1569-1579
Author(s):  
George F. Caudle ◽  
Jerald R. Izatt ◽  
Tuan-Kay Lim
Keyword(s):  
Cross Sections ◽  
Average Power ◽  
Excited State Absorption ◽  
Laser Pulses ◽  
Beam Power ◽  
Hole Burning ◽  
Saturable Absorbers ◽  
Pulse Transmission ◽  
Band Absorption ◽  
Level Model

Due to rotational hole burning Q-switched laser pulses sometimes saturate a molecular absorber more effectively than CW laser radiation. The absorption by SF6 of frequencies near the P(28) line in the 10.6 μm CO2 laser band provides an interesting example. In this case it has been reported elsewhere that for peak intensities [Formula: see text] an increase in pulse intensity produces a monotonic increase in transmission whereas the CW transmission decreases monotonically with intensity. We report new measurements made over a wider range of laser power levels and at several SF6 pressures, which show that the global behavior of the transmission as a function of average beam power is quite similar for both CW and pulsed radiation. The pulse transmission is somewhat greater at all power levels, but when the average power is sufficiently high the growth of hot-band absorption and possibly other intensity dependent changes in the ground and excited-state absorption cross sections cause the transmission to fall well below its low-intensity value for CW radiation and pulses alike. The experimental transmission curves for both cases display as many as three extrema and cannot be explained, even qualitatively, by the five-level model used in the earlier work. The extended results are consistent with the modified five-level model presented in Part I of this pair of papers.

scholarly journals Ultrafast stimulated emission microscopy of single nanocrystals

Science ◽  
2019 ◽  
Vol 366 (6470) ◽  
pp. 1240-1243 ◽  
Author(s):  
Lukasz Piatkowski ◽  
Nicolò Accanto ◽  
Gaëtan Calbris ◽  
Sotirios Christodoulou ◽  
Iwan Moreels ◽  
...  
Keyword(s):  
Excited State ◽  
Spontaneous Emission ◽  
Single Molecule ◽  
Room Temperature ◽  
Direct Detection ◽  
Excited State Absorption ◽  
Stimulated Emission ◽  
Detection Capability ◽  
Emission Signal ◽  
Carrier Population

Single-molecule detection is a powerful method used to distinguish different species and follow time trajectories within the ensemble average. However, such detection capability requires efficient emitters and is prone to photobleaching, and the slow, nanosecond spontaneous emission process only reports on the lowest excited state. We demonstrate direct detection of stimulated emission from individual colloidal nanocrystals at room temperature while simultaneously recording the depleted spontaneous emission, enabling us to trace the carrier population through the entire photocycle. By capturing the femtosecond evolution of the stimulated emission signal, together with the nanosecond fluorescence, we can disentangle the ultrafast charge trajectories in the excited state and determine the populations that experience stimulated emission, spontaneous emission, and excited-state absorption processes.

Fluorescence dynamics, excited-state absorption, and stimulated emission of Er^3+ in KY(WO_4)_2

1998 ◽  
Vol 15 (3) ◽  
pp. 1205 ◽  
Author(s):  
N. V. Kuleshov ◽  
A. A. Lagatsky ◽  
A. V. Podlipensky ◽  
V. P. Mikhailov ◽  
A. A. Kornienko ◽  
...  
Keyword(s):  
Excited State ◽  
Excited State Absorption ◽  
Stimulated Emission

Excited-state absorption and stimulated emission of tetrahedral Co 2+ ion in LiGa 5 O 8

1999 ◽  
Vol 69 (1) ◽  
pp. 41-44 ◽  
Author(s):  
K.V. Yumashev ◽  
N.N. Posnov ◽  
V.P. Mikhailov
Keyword(s):  
Excited State ◽  
Excited State Absorption ◽  
Stimulated Emission
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