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  • 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference
  • (Optica Publishing Group, 2015),
  • paper CA_6_1

Diode pumping of ultrafast Ti:Sapphire lasers: power scaling to 200 mW in 68 fs and first noise analysis

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Abstract

Ti:Sapphire lasers are widely used due to their large tunability, short pulse duration, and high stability, despite the need for complex and expensive pump lasers operating in the blue-green spectral region. In contrast, fiber lasers and diode-pumped solid-state lasers (DPSSLs) can be efficiently pumped by cost-effective and reliable laser diodes. With the advent of gallium nitride (GaN) laser diodes, Roth et al. demonstrated the first blue-pumped Ti:Sa DPSSL [1]. However, the pump wavelength of 452 nm led to slow deterioration of the output power [1]. The highest output power from a Ti:Sa DPSSL so far was 105 mW in 50-fs pulses, with a total pump power of 4 W [2]. The recent availability of green pump diodes enabled the first demonstration of a green-pumped Ti:Sa DPSSL achieving 23.5 mW average power and 62 fs pulses using a 1-W laser diode [3]. This power is too low for many applications, and it was not clear if higher efficiencies than 2.5% can be achieved at watt-level blue-green diode pumping. Moreover, the effect of the multi transverse mode pump on the noise was not evaluated, raising the question of their potential use for frequency comb applications.

© 2015 IEEE

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