Abstract
Energy-transfer-coupled polymeric composites with donors of two-absorbing dyes and acceptors of polymer gain medium are introduced for up-converted laser applications. The two-photon pumped hybrid polymer lasers show significant performance improvement with nearly 10 times reduction of lasing threshold and over 100 times extension of lifespan.
Highlights
Multi-photon pumped lasing has significant advantages over the conventional method of sumfrequency generation for laser frequency up-conversion when the phase-matching cannot be fulfilled [1,2,3,4,5,6,7,8,9,10,11,12,13,14]
We have demonstrated a low threshold TP-pumped DFB laser, with over 100 times of lifespan extension
The excitation threshold is orders of magnitude lower as compared with previously characterized semiconductor nanocrystals [11,12,17], nanodisks [13], and nanowires [10], and the current system is among the lowest in TP-pumped polymer lasers to the best of our knowledge [7,8,9]. Such composite gain materials can be used as an alternative method to circumvent the two major drawbacks in traditional TP-pumped systems, i.e. high threshold and short lifespan, with potential to push forward the practical applications of frequency up-converted lasers
Summary
Multi-photon pumped lasing has significant advantages over the conventional method of sumfrequency generation for laser frequency up-conversion when the phase-matching cannot be fulfilled [1,2,3,4,5,6,7,8,9,10,11,12,13,14]. The up-converted lasers, realized with near infrared (NIR) wavelength pumping, are promising for applications in advanced laser technologies, microfabrications, and biophotonics. These potentials are hindered by high pump thresholds and short operation lifetime in currently available devices [1,15]. High quality photonic microcavities [7,9,13] and photo-stable nanocrystals [11,12,16,17] have been introduced to overcome these drawbacks These efforts have improved the laser performance to some extent; the ultimate solution still relies on developing new stable materials with efficient multi-photon pumped gain at low pumping power. The ET-based TP pumping mechanisms of the novel dye-polymer hybrid composites were investigated by time-resolved photoluminescence (TRPL) spectroscopy
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