PM567-Doped solid dye lasers based on PMMA |
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| Authors: | Li Xiao-Hui Fan Rong-Wei Xia Yuan-Qin Liu Wei and Chen De-Ying |
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| Affiliation: | National Key Laboratory of Tunable Lasers, Institute of Optical-Electronics,Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | Polymers are a kind of attractive hosts for laser dyes due to their
high transparency in both pumping and lasing ranges and superior
optical homogeneity. In this paper solid dye samples based on
polymethyl methacrylate (PMMA) doped with different concentrations of
1, 3, 5, 7, 8 -pentamethyl-2, 6-diethylpyrromethene-BF$_{2 }$ (PM567)
are prepared. The absorption, fluorescence and lasing spectra of the
samples are obtained. Wide absorption and fluorescence bands are
obtained and a red shift of the maxima of the lasing emission spectra
is observed. With the second-harmonic generation of Q-switched Nd:YAG
laser (532\,nm, $\sim $20\,ns) pumping the samples longitudinally,
the slope efficiencies of the samples are obtained. There is an
optimal dye concentration for the highest slope efficiency when the
pumping energy is lower than some typical value ($\sim $250\,mJ), and
the highest slope efficiency 35.6{\%} is obtained in the sample with
a dye concentration of $2\times10^{ - 4}$\,mol/L. Pumping the samples
at a rate of 10Hz with a pulse energy as high as 200\,mJ (the fluence
is 0.2\,J/cm$^{2})$, the output energy drops to one-half of its
initial value after approximate 15500 pulses and the normalized
photostability is 5.17\,GJ/mol. A kind of solid dye laser which could
have some applications is built. |
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| Keywords: | solid dye laser PMMA slope
efficiency photostability |
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