Near-infrared laser emission from luminescent plastic waveguides

Kobayashi, Takeyuki; Savatier, Jean-Baptiste; Jordan, Grace; Blau, Werner J.; Suzuki, Yasuhiro; Kaino, Toshikuni
July 2004
Applied Physics Letters;7/12/2004, Vol. 85 Issue 2, p185
Academic Journal
We have demonstrated optical gain and laser emission in multimoded plastic waveguides containing a near-infrared-emitting compound, 2-(6-(4-dimethylaminophenyl)-2,4-neopentylene-1,3,5-hexatrienyl)-3-methyl-benzothiazolium perchlorat. The poly(1-vinyl-2-pyrrolidone)-base planar waveguides, 1 cm in length and 50 μm in thickness, doped with 0.5 wt % of the compound have exhibited lasing at 820 nm under transverse nanosecond photoexcitation at 532 nm. Optical feedback is provided by the 4% reflective facets of the cleaved waveguide edges. The threshold for lasing is found to be 128±30 μJ/cm2 (25.5±5.9 kW/cm2). Gain spectroscopy has shown a moderate net modal gain of 2.6±0.3 cm-1 (11.3±1.3 dB/cm) at 820 nm for the pump fluence of 115 μJ/cm2 (23.1 kW/cm2). Our results will open the door to the study and development of compact plastic waveguide lasers and amplifiers operating in the near-infrared region.


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