Dipolar organic materials producing highly efficient...

Details Dipolar organic materials producing highly efficient... Dipolar organic materials producing highly efficient...

2005-01-04

2005-01-04

Harvey, Minsun Oh (Department: 2828)

Coherent light generators

Particular active media

C372S001000, C372S036000, C372S051000, C372S052000, C372S053000

Reexamination Certificate

active

06839368

ABSTRACT:
High-efficiency laser-like emission at low thresholds in dipolar organic materials upon pulsed optical excitation, without using any external mirrors. Unusually high conversion efficiencies and low thresholds in laser-like emission have been observed in the solutions of organic molecular salts having large dipole moments and specific dye molecules having high photoluminescence efficiencies. Pumped with frequency-doubled pulses from a Nd:YAG laser, conversion efficiencies in the range of 15-40% were achieved without incorporation of external mirrors. The threshold pump energies for such emission have been observed to be low (<8 μJ). The spectrally narrowed output beam was found to have low divergence, high degree of polarization, and pulse-width less than that of the excitation pulses (50 picoseconds). The exceptionally low threshold (<1 μJ) and high energy conversion efficiencies observed in molecular salts have been attributed to the large excited-state dipole moment of these noncentrosymmetric molecules favoring strong cooperative (laser-like) emission in spite of small photoluminescence quantum efficiencies.

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