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Optica Publishing Group
  • CLEO/Europe and EQEC 2009 Conference Digest
  • (Optica Publishing Group, 2009),
  • paper CJ_P23

Experimental study of a passively mode-locked Yb-doped single-polarization microstructure fiber laser

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Abstract

Applications of ultrafast laser technology outside a laboratory environment rely on environmentally stable and maintenance- and alignment-free femtosecond pulses sources. Mode-locked fiber lasers are considered as prime candidates to fulfill these requirements. Very recently, significant energy scaling has been demonstrated in mode-locked fiber lasers using large-mode-area (LMA) photonic crystal fibers [1-2]. However, the drawback of standard LMA microstructure fiber is their moderate linear birefringence which is sensitive to thermal and mechanical perturbations. The most common approach to compensate the linear polarization drifts in the fiber consists to use polarization-maintaining fibers with the light polarized only along the slow axis [3]. Recently, an environmentally stable mode-locked fiber laser with more than 25 nJ energy has been realized by using a single-polarization LMA microstructure fiber [4]. In this communication, we report on passively mode-locked single-polarization LMA microstructure fiber laser operating in the purely normal dispersion regime. Stable self-starting mode-locking is obtained using a semiconductor saturable absorber mirror (SESAM). We study the influence of the modulation depth and relaxation time of the SESAM on the mode-locking performances. Different SESAMs with modulation depths varying from 10 to 35% and relaxation times from 500 fs to 9 ps have been used. For all the samples, the laser starts in a Q-Switch mode-locking regime. By increasing the pump power, the laser delivers a stable pulse train at a repetition rate of 65 MHz. The highest energies and the shortest pulse durations are obtained using fast SESAMs featuring modulation depths higher than 20%.

© 2009 IEEE

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