We have grown and characterized a SrWO 4 :Nd 3+ crystal. Photoluminescence and Raman spectra are exhibited. We have obtained end-pumped selfstimulated Raman scattering in the two 4 F 3/2 → 4 I 11/2 and 4 F 3/2 → 4 I 13/2 laser channels leading to 1.171 and 1.517 µm coherent radiations. The latter is close to the eye-safe range of wavelengths.
A comparative study of the optical absorption and luminescence of crystals
of NdAl3(BO3)4 (NAB), Nd:GdAl3(BO3)4 (NGAB)
and Nd:Gd0.2Y0.8Al3(BO3)4 (NGYAB) is
presented. The Judd-Ofelt theory is applied to the fitting of
experimental absorption line strengths to obtain the intensity
parameters Ωt (t = 2,4,6) with root mean square errors of
11.8%, 3.8% and 8.6% for NAB, NGAB and NGYAB respectively. The
intensity parameters are used to calculate the radiative transition
rates, branching ratios and radiative lifetimes of Nd3+ ions
undergoing transitions from 4F3/2 to 4IJ
manifolds. The relevant spectroscopic parameters for laser
applications (quantum efficiency and emission cross section) are
also estimated. The results are compared among the three samples
and other borate crystals. It is concluded that NAB is a laser
crystal with high gain and thus a promising candidate for microchip
laser application, while NGAB (or NGYAB) can be used as an
alternative to the celebrated nonlinear laser crystal NYAB.
We demonstrate the simultaneous generation of the three basal red–green–blue colors from a lone GdAl3(BO3)4:Nd3+ bi-functional laser and optical nonlinear crystal. The laser works in a dual-wavelength operation in the two F3/24→I11/24 (near 1062 nm) and F3/24→I13/24 (near 1338 nm) channels, under a fixed wavelength pumping (at 744.7 nm) and with a fixed crystal orientation. Red and green results from self-frequency doubling of the two laser channels, blue results of self-sum frequency mixing of the pump and the 1338 nm laser.
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