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Proceedings Article

Over 55W of frequency doubled light at 530 nm pumped by an all-fiber diffraction limited picosecond fibre MOPA

[+] Author Affiliations
Shaif-ul Alam, Kangkang Chen, John R. Hayes, Dejiao Lin, Andrew Malinowski, David J. Richardson

Univ. of Southampton (United Kingdom)

Howard J. Baker, Natalia Trela

Heriot-Watt Univ. (United Kingdom)

Roy McBride

PowerPhotonic, Ltd. (United Kingdom)

Proc. SPIE 7580, Fiber Lasers VII: Technology, Systems, and Applications, 758007 (February 17, 2010); doi:10.1117/12.845929
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From Conference Volume 7580

  • Fiber Lasers VII: Technology, Systems, and Applications
  • Kanishka Tankala
  • San Francisco, California, USA | January 23, 2010

abstract

We report the realisation of a high power, picosecond pulse source at 530 nm pumped by an all-fiber, single mode, single polarisation, Yb-doped MOPA. The pump MOPA comprised of a gain switched seed source generating 20 ps pulse source at a repetition frequency of 910 MHz followed by three amplification stages. Output power in excess of 100 W was obtained at 85% slope efficiency with respect to launched pump power at 975 nm. A 15mm long LBO crystal was used to frequency double the single mode, single polarisation output of the fiber MOPA. To satisfy the phase matching condition, the internal temperature of the LBO crystal was maintained at 1550C. Frequency doubled power in excess of 55 W was obtained at 56% optical-to-optical conversion efficiency. Output power at 530 nm started to roll-off after 50 W due to self-phase modulation (SPM) assisted spectral broadening of the fundamental light within the final stage amplifier. Measured spectral bandwidth of the frequency doubled signal remained at ~0.4 nm with the increase in fundamental power even though that of the fundamental increased steadily with output power and reached to a value of 0.9 nm at 100 W output power.

© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Shaif-ul Alam ; Kangkang Chen ; John R. Hayes ; Dejiao Lin ; Andrew Malinowski, et al.
"Over 55W of frequency doubled light at 530 nm pumped by an all-fiber diffraction limited picosecond fibre MOPA", Proc. SPIE 7580, Fiber Lasers VII: Technology, Systems, and Applications, 758007 (February 17, 2010); doi:10.1117/12.845929; http://dx.doi.org/10.1117/12.845929


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