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Proceedings Paper

Sub-100 fs high average power directly blue-diode-laser-pumped Ti:sapphire oscillator
Author(s): Andreas Rohrbacher; Vesna Markovic; Wolfgang Pallmann; Bojan Resan
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Paper Abstract

Ti:sapphire oscillators are a proven technology to generate sub-100 fs (even sub-10 fs) pulses in the near infrared and are widely used in many high impact scientific fields. However, the need for a bulky, expensive and complex pump source, typically a frequency-doubled multi-watt neodymium or optically pumped semiconductor laser, represents the main obstacle to more widespread use. The recent development of blue diodes emitting over 1 W has opened up the possibility of directly diode-laser-pumped Ti:sapphire oscillators. Beside the lower cost and footprint, a direct diode pumping provides better reliability, higher efficiency and better pointing stability to name a few. The challenges that it poses are lower absorption of Ti:sapphire at available diode wavelengths and lower brightness compared to typical green pump lasers. For practical applications such as bio-medicine and nano-structuring, output powers in excess of 100 mW and sub-100 fs pulses are required. In this paper, we demonstrate a high average power directly blue-diode-laser-pumped Ti:sapphire oscillator without active cooling. The SESAM modelocking ensures reliable self-starting and robust operation. We will present two configurations emitting 460 mW in 82 fs pulses and 350 mW in 65 fs pulses, both operating at 92 MHz. The maximum obtained pulse energy reaches 5 nJ. A double-sided pumping scheme with two high power blue diode lasers was used for the output power scaling. The cavity design and the experimental results will be discussed in more details.

Paper Details

Date Published: 16 March 2016
PDF: 5 pages
Proc. SPIE 9726, Solid State Lasers XXV: Technology and Devices, 97260Y (16 March 2016); doi: 10.1117/12.2208575
Show Author Affiliations
Andreas Rohrbacher, Lumentum (Switzerland)
Vesna Markovic, Lumentum (Switzerland)
Wolfgang Pallmann, Lumentum (Switzerland)
Bojan Resan, Lumentum (Switzerland)
Univ. of Applied Sciences and Arts Northwestern Switzerland (Switzerland)


Published in SPIE Proceedings Vol. 9726:
Solid State Lasers XXV: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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