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      Properties of a microjoule-class fiber oscillator mode-locked with a SESAM

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      Author
      Lecaplain, C.
      Ortac, Bülend
      MacHinet G.
      Boullet J.
      Baumgartl, M.
      Schreiber, T.
      Cormier, E.
      Hideur, A.
      Date
      2011
      Source Title
      2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)
      Publisher
      IEEE
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
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      98
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      Abstract
      Energy scaling of ultrafast Yb-doped fiber oscillators has experienced rapid progress largely driven by many applications that require high average power femtosecond pulses. The fundamental challenge for ultrafast fiber lasers relies on the control of excessive nonlinearity, which limits pulse energy. The development of all-normal dispersion laser cavities based on large-mode-area photonic crystal fibers (PCFs) has enabled significant energy scaling [1-3]. In particular, up to microjoule energy levels have been achieved from rod-type fiber-based oscillators [2-3]. In such lasers, pulse shaping is dominated by the strength of the mode-locking mechanism which determines the pulse properties. In this contribution, we report the generation of high-energy sub-picosecond pulses from a highly normal dispersion fiber laser featuring an Yb-doped rod-type PCF and a large-mode-area PCF [Fig.1(a)]. Passive mode-locking is achieved using saturable absorber mirrors (SAMs). We study the influence of the SAM parameters on performances obtained in this new class of fiber oscillators. The structures exhibit 20 % modulation depths and 500 fs relaxation time with resonant and antiresonant designs. The antiresonant SAM structures ensure absorption bandwidths 45 nm while the resonant structures exhibit 20 nm bandwidths. Stable mode locking with average powers as high as 15 μW at 15 MHz repetition rate, corresponding to microjoule energy level are obtained with all the structures. However, pulse properties and pulse shaping mechanism distinguish between resonant and antiresonant designs. Using a broadband antiresonant SAM leads to generation of highly-chirped pulses with 30 ps duration and 10 nm spectral width [Fig.1(b)]. The output pulses are extra-cavity dechirped down to 550 fs duration. By increasing the strength of the mode-locking mechanism through the combination of the SAM with the NPE process, we obtain shorter pulses with slightly boarder spectra. Indeed, the output pulse duration is decreased from 30 ps to 13 ps by adjusting the wave-plates settings. The dechirped pulse duration is then shortened to 450 fs. We note that the current laser performances are limited to 1 J by the available pump power. Using a resonant SAM structure, the output pulse duration is decreased to 7 ps [Fig.1(b)]. This pulse shortening results from the spectral filtering induced by the limited SAM bandwidth. All these results are in good agreement with numerical simulations which will be discussed in this communication. © 2011 IEEE.
      Keywords
      Antiresonant
      Energy level
      Energy scaling
      High average power
      High energy
      Large-mode-area photonic crystal fibers
      Laser performance
      Microjoule
      Mode-locked
      Modelocking
      Modulation depth
      Non-Linearity
      Normal dispersion
      Output pulse
      Passive mode locking
      Pulse durations
      Pulse energies
      Pulse shortening
      Pulse-shaping
      Pump power
      Repetition rate
      Resonant structures
      Sams
      Saturable absorber mirrors
      Spectral filtering
      Spectral widths
      Stable mode locking
      Ultra-fast
      Ultrafast fiber lasers
      Yb-doped fibers
      Bandwidth
      Dispersion (waves)
      Electromagnetic pulse
      Electron optics
      Fiber lasers
      Fibers
      Mode-locked fiber lasers
      Optics
      Photonic crystals
      Pulse shaping circuits
      Pumping (laser)
      Quantum electronics
      Single mode fibers
      Ultrashort pulses
      Ytterbium
      Photonic crystal fibers
      Permalink
      http://hdl.handle.net/11693/28351
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/CLEOE.2011.5942877
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      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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