Laser action of two conjugated polymers in solution and in solid matrix: The effect of aggregates on spontaneous and stimulated emission

2002 ◽  
Vol 65 (19) ◽  
Author(s):  
M. Fakis ◽  
I. Polyzos ◽  
G. Tsigaridas ◽  
V. Giannetas ◽  
P. Persephonis ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Laser Action ◽  
Stimulated Emission ◽  
Solid Matrix

scholarly journals Advances in Conjugated Polymer Lasers

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 443 ◽  
Author(s):  
Hongyan Xia ◽  
Chang Hu ◽  
Tingkuo Chen ◽  
Dan Hu ◽  
Muru Zhang ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Cross Sections ◽  
Conjugated Polymer ◽  
Low Cost ◽  
Research Direction ◽  
Stimulated Emission ◽  
Laser Materials ◽  
Radiation Mechanism ◽  
The Subject ◽  
Low Cost Manufacturing

This paper provides a review of advances in conjugated polymer lasers. High photoluminescence efficiencies and large stimulated emission cross-sections coupled with wavelength tunability and low-cost manufacturing processes make conjugated polymers ideal laser gain materials. In recent years, conjugated polymer lasers have become an attractive research direction in the field of organic lasers and numerous breakthroughs based on conjugated polymer lasers have been made in the last decade. This paper summarizes the recent progress of the subject of laser processes employing conjugated polymers, with a focus on the photoluminescence principle and excitation radiation mechanism of conjugated polymers. Furthermore, the effect of conjugated polymer structures on the laser threshold is discussed. The most common polymer laser materials are also introduced in detail. Apart from photo-pumped conjugated polymer lasers, a direction for the future development of electro-pumped conjugated polymer lasers is proposed.

Stimulated emission of Ho3+ and Er3+ ions in Gd3Ga5O12 crystals and cascade laser action of Ho3+ ions over the5S2 →5I5 →5I6 →5I8 scheme

1979 ◽  
Vol 53 (2) ◽  
pp. K219-K222 ◽  
Author(s):  
A. A. Kaminskii ◽  
V. A. Fedorov ◽  
S. E. Sarkisov ◽  
J. Bohm ◽  
P. Reiche ◽  
...  
Keyword(s):  
Laser Action ◽  
Stimulated Emission

VUV SPECTROSCOPY OF CRYSTALLINE EMITTERS BASED ON 5d–4f TRANSITIONS IN RARE EARTH IONS

2002 ◽  
Vol 09 (01) ◽  
pp. 621-626 ◽  
Author(s):  
V. N. MAKHOV ◽  
N. YU. KIRIKOVA ◽  
N. M. KHAIDUKOV ◽  
M. KIRM ◽  
E. NEGODIN ◽  
...  
Keyword(s):  
Stokes Shift ◽  
Laser Action ◽  
Spectroscopic Properties ◽  
Rare Earth Ions ◽  
Stimulated Emission ◽  
Solid State Lasers ◽  
Nonradiative Relaxation ◽  
Level Laser ◽  
Vuv Spectroscopy ◽  
Strong Spin

The spectroscopic properties of several fluoride crystals ( LiYF 4, KYF 4, K 2 YF 5, KLiYF 5, CsY 2 F 7, SrF 2) doped with Nd 3+, Er 3+ or Tm 3+ are analyzed from the viewpoint of their possible applications as active media for VUV solid state lasers. It has been found that in many crystals there exists very efficient nonradiative relaxation from higher-lying 5d states to the lowest 5d level responsible for the spin-forbidden luminescence. In fact, the energy level diagram of 5d–4f transitions for these two ions represents a typical four-level laser scheme with a considerably larger Stokes shift of 5d–4f luminescence from the edge of the strong spin-allowed 4f–5d absorption than for Nd 3+, which causes smaller reabsorption of emitted VUV radiation in the crystals doped with Er 3+ or Tm 3+. Two crystals LiYF 4: Nd 3+ and SrF 2: Er 3+ were tested for laser action under pumping by a pulsed F 2 laser operating at 157 nm. However, no indications of the appearance of stimulated emission have been detected for both crystals. The possible reasons for the absence of lasing are discussed.

Stimulated emission from films of conjugated polymers and oligomers

1997 ◽  
Author(s):  
Paul F. van Hutten ◽  
Hendrik-Jan Brouwer ◽  
Victor V. Krasnikov ◽  
T. A. Pham ◽  
Richard E. Gill ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Stimulated Emission

scholarly journals Intrachain photoluminescence properties of conjugated polymers as revealed by long oligothiophenes and polythiophenes diluted in an inactive solid matrix

2006 ◽  
Vol 73 (23) ◽  
Author(s):  
Katsuichi Kanemoto ◽  
Tatsuji Sudo ◽  
Ichiro Akai ◽  
Hideki Hashimoto ◽  
Tsutomu Karasawa ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Solid Matrix ◽  
Photoluminescence Properties

Highly photoluminescent conjugated polymers: stimulated emission and device applications

1997 ◽  
Author(s):  
Fumitomo Hide ◽  
Benjamin J. Schwartz ◽  
Maria A. Diaz-Garcia ◽  
Alan J. Heeger
Keyword(s):  
Conjugated Polymers ◽  
Stimulated Emission ◽  
Device Applications

Entropy and Efficiency in Laser Cooling of Solids

2007 ◽  
Author(s):  
Xiulin Ruan ◽  
Stephen C. Rand ◽  
Massoud Kaviany
Keyword(s):  
Laser Cooling ◽  
Laser Action ◽  
Blackbody Radiation ◽  
Stimulated Emission ◽  
Light Sources ◽  
Photon Distribution ◽  
Random Lasers ◽  
Emission Process ◽  
Wide Range ◽  
Radiation Entropy

The thermodynamics of laser cooling of solids is analyzed. Using the general theory of radiation entropy, the important roles of the optical frequency and the photon distribution function in determining the radiation entropy are identified. The usefulness of a narrowband approximation is established for a wide range of radiant sources. This approximation is then applied to compare the entropies of different light sources, including blackbody radiation, lasers, fluorescence, and the emerging class of random lasers. Based on these results, the Carnot efficiency for laser cooling of solids is determined, for emission fields with various entropy characteristics. It is shown that fluorescent emission is the most efficient form of the radiated field for laser cooling of solids, and cooling schemes based on any stimulated emission process (including random laser action) are inherently less efficient. The influence of luminescence quantum yield on cooling is also considered.

Conjugated polymers: lasing and stimulated emission

2001 ◽  
Vol 5 (2-3) ◽  
pp. 143-154 ◽  
Author(s):  
U Scherf ◽  
S Riechel ◽  
U Lemmer ◽  
R.F Mahrt
Keyword(s):  
Conjugated Polymers ◽  
Stimulated Emission
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