In this Letter, we present a figure-eight all-PM-fiber laser oscillator design with a nonlinear optical loop mirror as an artificial saturable absorber. Unlike previous constructions using the same mode-locking technique, our cavity is constructed entirely of polarization-maintaining (PM) fibers, making the oscillator more resistant to thermal and mechanical perturbations. Two simple and robust laser configurations that differ by the output coupling ratio (70% or 30%) are presented. The first configuration delivers high energy pulses of 3.5 nJ, and the second configuration delivers pulses of 1.6 nJ at a common repetition rate of 15 MHz. In either configuration, the pulsed operation is stable, and the laser operates in a single pulse train regime, even for pump powers approaching twice the power required for mode-locking. We have also observed that, at higher intracavity powers, stimulated Raman scattering plays a significant role.
We demonstrate an all-fiber ultrafast ytterbium laser oscillator mode-locked by means of a nonlinear polarization evolution (NPE) method realized in polarization-maintaining (PM) fibers. A sequence of the PM fiber pieces is shown to perform NPE action while maintaining a required temporal overlap of the ordinary and extraordinary pulses propagating through it. We present details of simple numerical simulations showing the advantage of the proposed scheme of segmented PM fibers. The laser utilizing the above mentioned design which generates ultrashort pulses at a 20.54 MHz repetition rate with the dechirped pulse duration around 150 fs and a pulse energy of 0.85 nJ is also presented.
In this paper we demonstrate the first, to the best of our knowledge, all-fiber self-starting laser oscillator consisting entirely of polarization-maintaining large mode area (PLMA) fibers mode-locked with nonlinear optical loop mirror (NOLM). The system works in a Raman-free dissipative soliton regime and operates at a central wavelength of 1030 nm. It delivers stable ultrashort pulses of high energy of 12 nJ at a 7.56 MHz repetition rate which can be compressed down to the Fourier transform limit of ∼250 fs. Higher energies were limited by the formation of multiple pulses in the cavity.
We examine properties of an ultrashort laser pulse propagating through an artificial Saturable Absorber based on Nonlinear Polarization Evolution device which has been realized with Polarization Maintaining fibers only (PM NPE). We study and compare in-line and Faraday Mirror geometries showing that the latter is immune to errors in the PM NPE construction. Experimental results for the transmission measurements of the PM NPE setup for different input linear polarization angles and various input pulse powers are presented. We show that PM NPE topology is of crucial importance for controlling the properties of the output pulse as it rules the contribution of cross-phase modulation to an overall nonlinear phase change. We also demonstrate an excellent agreement between the numerical model and experimental results.
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