Q-switching in fibre-lasers

Barnes, W.L., Morkel, P., Farries, M.C., Reekie, L. and Payne, D.N. (1989) Q-switching in fibre-lasers. In, SPIE Conference Fibre Laser Sources and Amplifiers, Boston, US, 06 - 08 Sep 1989. 11pp.


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One of the most attractive features of fibre lasers is their ability to produce significant pulse powers when Q-switched. Potential applications for such lasers include non-linear switching, OTDR measurements, materials processing and range-finding. We have, already demonstrated 100W:15ns pulses from a diode pumped Nd3+ fibre-laser and have obtained 15W:70ns at 1.56µm with a diode pumped Er3+/Yb3+ system. Pulses of 8W:155ns have been obtained in the visible from a Sm3+ fibre-laser (although this required an Ar+ pump laser). Considerably higher powers than these are predicted for diode-pumped lasers. In particular, theoretical analysis shows that the Er3+ laser is capable of producing pulses in excess of 1kW. To date the performance of the Q-switched fibre laser has been limited by the modulator used to effect the Q-switching. problems involved in Q-switching will be discussed and we will look at ways of overcoming them. Theoretical modelling allows us to predict many of the properties required of a modulator and the results of such calculations will be presented. In addition, Q-switched pulses are seen experimentally to be modulated at the round trip frequency - for some applications this effect may be very important and its origin will be discussed.

Item Type: Conference or Workshop Item (Paper)
Related URLs:
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: University Structure - Pre August 2011 > Optoelectronics Research Centre
Faculty of Physical Sciences and Engineering > Optoelectronics Research Centre
ePrint ID: 77532
Date Deposited: 11 Mar 2010
Last Modified: 27 Mar 2014 18:57
URI: http://eprints.soton.ac.uk/id/eprint/77532

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