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6880799 
Journal Article 
Laser properties of a conjugate polymer (MEH-PPV) in the liquid-excimeric state 
Masilamani, V; Ibnaouf, KH; Alsalhi, MS; Yassin, OA; , 
2007 
1 
Laser Physics
ISSN: 1054-660X
EISSN: 1531-8494 
MAIK NAUKA/INTERPERIODICA/SPRINGER 
NEW YORK 
1367-1373 
WOS:000251592500005 
We have studied the amplified spontaneous-emission characteristics (ASE) of conjugated poly[2-methoxy-5-(2-ethylhexyloxy)1,4-phenylenevinylene] MEH-PPV in a few organic solutions. The ASE of MEH-PPV appears to arise from its excimeric state. This is perhaps the first report, to the best of our knowledge, on an excimeric-liquid state laser. MEH-PPV in solutions of benzene or tetrahydrofuran (THF) was pumped by the second and third harmonics of an Nd:YAG (532 and 355 nm) for different pump-pulse energies. The ASE of MEH-PPV was compared with the conventional laser dyes Rhodamine B (Rh B) and Rhodamine 6G (Rh 6G). The most important and distinguishing features are: (a) MEH-PPV has a four-times better photochemical stability than Rh B or Rh 6G; (b) the threshold and concentration for the laser action in MEH-PPV is far less than Rh B or Rh 6G.