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  • 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference
  • (Optica Publishing Group, 2015),
  • paper CA_8_3

Wavelength Tuning of Diode-pumped Pr3+-Lasers

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Abstract

Many years of investigation on visible lasers based on trivalent praseodymium (Pr3+) resulted in various reports on highly efficient, low threshold lasers at a variety of distinct wavelengths throughout the whole visible spectral region [1-3]. This is owed to the high peak cross sections of the spin allowed intraconfigurational 4f-transitions of Pr3+ (see energy level scheme in Fig. 1 a). Lasers with multiwatt of output power at slope efficiencies around 70 % have been demonstrated in the green and red spectral region [2]. Often complex or expensive pump sources were applied [1,2,4-6] when high pump powers were desired. Nowadays, progress in the development of InGaN laser diodes (InGaN-LD) emitting around 445 nm allows for resonant pumping with compact and cost-efficient watt-level pump sources. Besides the distinct narrow-linewidth emission transitions, Pr3+ exhibits broad vibronic side bands around these peaks. The emission cross sections of these side bands may reach values of several 10−21 cm2, which is sufficient to obtain laser emission in a four-level laser configuration with reasonable pump power thresholds. The semi-logarithmic plot of the emission cross section spectrum of Pr3+:KY3F10 in Fig. 1 b) clearly illustrates this. The right ordinate shows the estimated threshold pump powers Pthr extrapolated from observed laser thresholds at different wavelengths and total roundtrip losses of ~ 1 %. At 1 W of pump power from an InGaN-laser diode, laser operation with Pr3+:KY3F10 seems feasible in wide spectral bands from the green to the dark red.

© 2015 IEEE

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