High-average-power (>20-W) Nd:YVO-4 lasers mode locked by strain-compensated saturable Bragg reflectors

D. Burns, M. Hetterich, A.I. Ferguson, E.A.J.M. Bente, M.D. Dawson, J.I. Davies, S.W. Bland

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Strain-compensated double InGaAs quantum-well saturable Bragg reflectors (SBR’s) with high damage thresholds have been developed for use as mode-locking elements in high-average-power neodymium lasers. Nd:YVO4 lasers have been developed with these new SBR’s, which produce transform-limited pulses of 21-ps duration at 90 MHz and an average power of 20 W in a diffraction-limited output beam. The peak pulse power at an output power of 20 W was 10.6 kW. A comparison of the operating parameters of strained single and strain-compensated double-well SBR’s indicates that the damage threshold increased by a factor of at least 2–3. Long cavity laser variants were nvestigated to assess the limitations of further power scaling. At a repetition frequency of 36-MHz stable mode-locked pulses with peak pulse powers of 24.4 kW and pulse energies of 0.6 mJ could be generated.
Original languageEnglish
Pages (from-to)919-926
Number of pages8
JournalJournal of the Optical Society of America
Issue number6
Publication statusPublished - 2000


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