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Coherent stacking of frequency-chirped pulses for stable generation of controlled pulse shapes |
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| Institution: | 1. Acoustic Science and Technology Laboratory, College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin, Heilongjiang, 150001, China;2. College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin, Heilongjiang 150001, China;3. Institute of Sound and Vibration Research, University of Southampton, Southampton, SO17 1BJ, U.K |
| Abstract: | Experiments on multiple-pulse stacking have revealed that there is frequency chirp in the incident laser pulse generated by active AM mode-locking. A square pulse is stably generated by the pulse stacking method when we consider the frequency chirp in the incident pulse. A square pulse of 890 ps duration has been obtained by stacking three pulses of 220 ps pulse width. This method will be easily extended to stably generate flat-top pulses of longer duration as predicted by calculation for coherent superposition of frequency-chirped pulses. |
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