Commercial LED Pumped Organic Semiconductor Lasers
Indirect electrical pumping of OSLs using a commercially available light-emitting diode is investigated in Chap. 5. To achieve this, low threshold organic laser materials and high power LEDs are required. A very promising gain material BBEHP-PPV was custom synthesized at the University of Strathclyde. Due to the general difficulty in the reproducing of the synthesis, the collaborators supplied various batches of the BBEHP-PPV polymer. Their photophysical and gain properties are studied in detail and the better batches are used to fabricate low threshold one-dimensional DFB lasers. A 448 nm peak emission Philips LUMILED GaN LED is a strong candidate for laser pumping as it has very high emitting intensity under pulsed operation. For the first time, an inorganic LED pumping an organic laser far above threshold is demonstrated in this chapter. The divergence of the output beam is measured as well as the dynamics of the polymer laser emission pulse. This pumping geometry provides a convenient and low-cost way to convert a divergent and incoherent light source into a near-collimated and coherent laser source.
KeywordsEffective Refractive Index Pump Intensity Holographic Grating Lead Pulse Laser Emission Spectrum
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