Abstract
An excited dimer is an important complex formed in nano- or pico-second time scales in many photophysics and photochemistry applications. The spectral and temporal profile of the excimer state of a laser from a new conjugated polymer, namely, poly (9,9-dioctylfluorenyl-2,7-diyl) (PFO), under several concentrations in benzene were investigated. These solutions were optically pumped by intense pulsed third-harmonic Nd:YAG laser (355-nm) to obtain the amplified spontaneous emission (ASE) spectra of a monomer and an excimer with bandwidths of 6 and 7 nm, respectively. The monomer and excimer ASEs were dependent on the PFO concentration, pump power, and temperature. Employing a sophisticated picosecond spectrometer, the time evolution of the excimer state of this polymer, which is over 400 ps, can be monitored.
Highlights
Of all the four class of laser media, liquid solutions have certain unique advantages and are often called the ‘pipe dream’of laser physicists [1]
This is because the liquids are essentially self-curing and could be circulated to enhance overall working time durability. They could be mode locked to produce a train of picosecond pulses or made to work in continuous wave (CW) mode
Most of them are tunable over the entire visible region of the spectrum with the additional advantage of working in superradiant mode. Organic dyes, such as coumarins or rhodamines, were popular for a few decades, until the conjugated polymer (CP) came into competition, often supplementing or complementing the conventional dyes. This is because CPs have large Stokes shift by 100 nm, or more, which would reduce the reabsorption loss and lead to potential high energy application by increasing the concentration of active species in a number of reports that for conjugated polymer like MEH-PPV, photochemical stability is many times better than conventional laser dyes [2]
Summary
Of laser physicists [1] This is because the liquids are essentially self-curing and could be circulated to enhance overall working time durability. They could be mode locked to produce a train of picosecond pulses or made to work in continuous wave (CW) mode. Most of them are tunable over the entire visible region of the spectrum with the additional advantage of working in superradiant mode. Organic dyes, such as coumarins or rhodamines, were popular for a few decades, until the conjugated polymer (CP) came into competition, often supplementing or complementing the conventional dyes. This is because CPs have large Stokes shift by 100 nm, or more, which would reduce the reabsorption loss and lead to potential high energy application by increasing the concentration of active species in a number of reports that for conjugated polymer like MEH-PPV, photochemical stability is many times better than conventional laser dyes [2]
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