Abstract
Ultraviolet and blue light were obtained by nonlinear frequency conversion in a random laser (RL) based on Nd0.10Y0.90Al3(BO3)4 nanocrystalline powder. RL operation at 1062 nm, due to the 4F3/2 → 4I11/2 transition of neodymium ions (Nd3+), was achieved by exciting the Nd3+ with a tunable beam from 680 to 920 nm covering the ground state absorption transitions to the 4F9/2, (4F7/2,4S3/2), (4F5/2,2H9/2), and 4F3/2 states. Light from 340 to 460 nm was obtained via the second-harmonic generation of the excitation beam while tunable blue light, from 417 to 486 nm, was generated by self-sum-frequency mixing between the excitation beam and the RL emission.
Highlights
Electrically pumped random laser (RL) tunable from 352 to 377 nm has been demonstrated in MgZnO films[25], whereas using a similar material, optically pumped tunable RL emission from 375 to 400 nm was reported[26]
A tunable light source, emitting from 340 to 486 nm, based on the interplay between RL emission, self-SFG and second-harmonic generation is demonstrated for the first time to the best of our knowledge
The excitation of the nanocrystals was performed with an optical parametric oscillator (OPO) pumped by the SH of a Q-switched Nd:YAG laser (1064 nm; 7 ns, 5 Hz)
Summary
To the RL emission, the excitation around the four absorption bands shown, enabled the observation of SH of the excitation beam, self-SHG of the RL, and self-SFG by the wave-mixing between the RL and the excitation beam These generation processes are efficient because of the high second-order nonlinear coefficients of the Nd0.10Y0.90Al3(BO3)[4] nanocrystals[24].
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