Feedback-controlled prelasing: a technique for pulse amplitude and frequency stabilisation of Q-switched lasers

Bollig, C., Butterworth, S.D., Clarkson, W.A. and Hanna, D.C. (1995) Feedback-controlled prelasing: a technique for pulse amplitude and frequency stabilisation of Q-switched lasers. In, Quantum Electronics Conference (QE12), Southampton, 04 - 08 Sep 1995.


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A reliable single-frequency Q-switched laser with high pulse repetition frequency (PRF) and good pulse to pulse stability is desirable for many applications, including those where a high average power is required. One popular approach for obtaining single-frequency operation of Q-switched lasers is to use the technique of prelase Q-switching, where a low power single-frequency oscillation is established prior to opening the Q-switch. In practice this technique has been limited to low PRFs (typically ?1kHz) since the prelase usually begins with strong spiking behaviour followed by relaxation oscillations. These take a time to decay to the steady prelase required for reliable single-frequency operation and high pulse to pulse stability. At high PRFs, when the Q-switched pulse builds up from prelase spikes, large fluctuations in pulse amplitude and excessive timing jitter occur. In this paper we report a new technique involving actively controlling the diffraction loss of the Q-switch, so as to damp out spiking and relaxation oscillation. We have applied this technique to a Nd:YAG ring laser, pumped by a 1.2W high-brightness diode, in which a single acousto-optic modulator enforces unidirectional operation and is used to Q-switch the laser.

Item Type: Conference or Workshop Item (Paper)
Additional Information: P4-5
Related URLs:
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions : University Structure - Pre August 2011 > Optoelectronics Research Centre
University Structure - Pre August 2011 > School of Physics and Astronomy
ePrint ID: 77074
Accepted Date and Publication Date:
Date Deposited: 11 Mar 2010
Last Modified: 31 Mar 2016 13:11

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