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Dispersionless saturable absorber mirrors with large modulation depths and low saturation fluences

Research output: Contribution to journalArticle

Author(s)

M. P. Lumb, P. N. Stavrinou, E. M. Clarke, R. Murray, C. G. Leburn, C. Jappy, N. K. Metzger, C Tom A Brown, W. Sibbett

School/Research organisations

Abstract

We show that it is possible to eliminate group delay dispersion over wide bandwidths in low-finesse, resonant saturable absorber mirrors, whilst maintaining a low saturation fluence and a high modulation depth. By modelling the mirror structure we demonstrate that these properties can be produced by capping a resonant device with a single dielectric layer of carefully selected refractive index. We show that a specially capped dispersionless structure minimises the temporal broadening of femtosecond pulses reflected from the mirror. We compare this device against uncapped-resonant and anti-resonant structures. The superior performance of the capped, dispersionless device was verified experimentally by comparing resonant, anti-resonant and dispersionless quantum-dot (QD) saturable absorber mirrors incorporated into a Cr4+:forsterite laser system. We found that a minimum pulse duration of 86 fs could be achieved for the dispersionless structure at 1290 nm with an output power of 55 mW compared to 122 fs in an anti-resonant structure and several-picosecond pulses for a resonant structure.

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Details

Original languageEnglish
Pages (from-to)53-60
Number of pages8
JournalApplied Physics B: Lasers and Optics
Volume97
Issue number1
DOIs
Publication statusPublished - Sep 2009

    Research areas

  • PASSIVE-MODE-LOCKING, SOLID-STATE LASERS, DIELECTRIC MIRRORS, FORSTERITE LASER, ULTRAFAST LASERS, FEMTOSECOND, REFLECTION, SESAMS

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