Spectroscopy, Modelling and Laser Operation of Holmium Doped Laser Crystals

1993 ◽  
Vol 329 ◽  
Author(s):  
Y. Kalisky ◽  
S. R. Rotman ◽  
G. Boulon ◽  
C. Pedrini ◽  
A. Brenier
Keyword(s):  
Energy Transfer ◽  
High Temperature ◽  
Excited States ◽  
Spectroscopic Studies ◽  
Laser Induced Fluorescence ◽  
Time Dependent ◽  
Laser Operation ◽  
Direct Energy ◽  
Laser Crystals ◽  
Back Transfer

AbstractSpectroscopic studies using laser induced fluorescence and numerical modelling of energy transfer and back transfer mechanism are reported in Er:Tm:Ho:YLF, Cr:Tm:Ho:YAG and Cr:Tm:YAG laser crystals at various temperatures (10 K-300 K). Direct energy transfer from Tm3+ excited states to Ho3+5I7 emitting level was observed and analyzed both in YAG and YLF. Further analysis of Cr3+ and Tm3+ time-dependent emission curves indicate a strong correlation of chromium-thulium pairs. Pulsed operation of holmium laser at high temperature will be presented.

Spectroscopy, modelling and laser operation of holmium doped laser crystals

1994 ◽  
Vol 04 (C4) ◽  
pp. C4-573-C4-577 ◽  
Author(s):  
Y. KALISKY ◽  
S. R. ROTMAN ◽  
G. BOULON ◽  
C. PEDRINI ◽  
A. BRENIER
Keyword(s):  
Laser Operation ◽  
Laser Crystals

Time-dependent behavior of nitric oxide excited states under the effect of electron impact

2021 ◽  
Vol 28 (2) ◽  
pp. 024503
Author(s):  
Mohammed amin Ferdi ◽  
Abdelaaziz Bouziane ◽  
Mourad Djebli
Keyword(s):  
Nitric Oxide ◽  
Electron Impact ◽  
Excited States ◽  
Time Dependent ◽  
Dependent Behavior

scholarly journals Ground- and excited-state characteristics in photovoltaic polymer N2200

RSC Advances ◽  
2021 ◽  
Author(s):  
Guanzhao Wen ◽  
Xianshao Zou ◽  
Rong Hu ◽  
Jun Peng ◽  
Zhifeng Chen ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Excited State ◽  
Steady State ◽  
Excited States ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Time Dependent ◽  
Functional Theory ◽  
Time Resolved ◽  
Dependent Density

Ground- and excited-states properties of N2200 have been studied by steady-state and time-resolved spectroscopies as well as time-dependent density functional theory calculations.

Excited states of analogue models of M-bacteriochlorophylls (M = Mg, Zn) in the photosynthetic reaction center: a time-dependent density functional theory study

2002 ◽  
Vol 06 (10) ◽  
pp. 617-625 ◽  
Author(s):  
Yoichi Yamaguchi
Keyword(s):  
Electron Transfer ◽  
Excited States ◽  
Density Functional ◽  
Photosynthetic Reaction Center ◽  
Excited Electron ◽  
Time Dependent ◽  
Analogue Model ◽  
Functional Theory ◽  
Special Pair ◽  
Dependent Density

Using time-dependent density functional theory (TDDFT), the excited states of the analogue model Mg -bacteriochlorophyll b - imidazole ( BChl -Im) dimer (P) for a special pair in the photosynthetic reaction center (RC) of Rhodopseudomonas (Rps.) viridis were examined. The calculated low-lying excited states and optimal geometries are in good agreement with experimental data. The order of the lowest unoccupied molecular orbital (LUMO) energies of P, the monomeric "accessory" BChl -Im (B), and bacteriopheophytin b ( H ) indicates the possibility of the light-induced electron transfer from P to H via B. The Im ligand of B destabilizes Goutermann's four-orbitals of BChl by 0.3-0.4 eV. With no energetic difference in the LUMOs between H and BChl , the Im ligands of P and B play an important role in providing a greater energetic gradient to the LUMOs along with the pathway for the excited-electron transfer in RC, resulting in the reduced reverse electron transfer from H to P (via B). Thus it is expected that the asymmetric Mg -Im interactions will directly affect the pathway of the excited-electron transfer. Using the deformed heterodimer (P') formed by the BChl halves with and without Im as the primary donor model, its cation radical P'+ was calculated as to whether the experimental asymmetric spin-density distribution can reproduce. The excited states of the analogue model Zn - BChl -Im dimer for a special pair in RC of the recently discovered Acidiphilium rubrum were also examined for a comparison with P.

Red Laser-Induced Fluorescence Energy Transfer in an Immunosystem

2000 ◽  
Vol 280 (2) ◽  
pp. 272-277 ◽  
Author(s):  
Bernhard Oswald ◽  
Frank Lehmann ◽  
Lydia Simon ◽  
Ewald Terpetschnig ◽  
Otto S. Wolfbeis
Keyword(s):  
Energy Transfer ◽  
Laser Induced Fluorescence ◽  
Fluorescence Energy Transfer ◽  
Fluorescence Energy

Spectroscopic properties, energy transfer, and laser operation of pulsed holmium lasers

1991 ◽  
Vol 70 (8) ◽  
pp. 4095-4100 ◽  
Author(s):  
Y. Kalisky ◽  
J. Kagan ◽  
D. Sagie ◽  
A. Brenier ◽  
C. Pedrini ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Spectroscopic Properties ◽  
Laser Operation
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