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Femtosecond Neodymium-doped microstructure fiber laser

Mathias Moenster, Peter Glas, Günter Steinmeyer, Rumen Iliew, Nikolay Lebedev, Reiner Wedell, and Mario Bretschneider

Open Access Open Access

Abstract

We demonstrate femtosecond operation of a Nd-doped microstructure fiber laser. The fiber provides gain and anomalous dispersion at the lasing wavelength of 1.06 μm and enables the construction of short and simple cavity designs. The laser is passively mode-locked by the combined action of a saturable absorber mirror, fiber nonlinearity, and dispersion and produces transform limited sub-400-fs pulses with a pulse energy as high as 100 pJ.

©2005 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. (a) SEM micrograph of the fiber end face as cleaved. (b) Cross section of the two polished fiber end faces (schematically). (c) Laser setup. The blue beam indicates the path of the laser cavity whereas the red beam represents the pump radiation. DM: dichroic mirror (T = 99% at 810 nm, R = 99% at 1054 nm), L1, L2 : aspheric lenses (f = 8 mm, NA = 0.5), P: dichroic glass polarizer, M : output coupling mirror (T = 30% at 1054 nm), Ti:Sa: cw Ti:sapphire pump laser, Nd:MSF: Nd-doped microstructure fiber.

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Fig. 2.
Fig. 2. (a) Measured SAM reflectivity vs. input pulse fluence. The measurement setup was similar to the one described in Ref. [14]. (b) Measured pump-probe response (normalized) of the SAM. The pulse source used for both measurements was a 180-fs passively mode-locked Nd:glass laser tuned to 1060 nm.

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Fig. 3.
Fig. 3. Intensity autocorrelation. The measured data (black rings) have been fitted assuming a sech2 pulse shape (red line). The inset shows the corresponding long-range autocorrelation.

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Fig. 4.
Fig. 4. (a) Optical spectrum of the mode-locked laser (resolution: 0.05 nm). The measured data (black line) has been fitted to the frequency representation of a sech2 pulse spectrum (dash-dotted red line). (b) RF spectrum of the first intermode beat centered at f R ≈ 95 MHz (resolution bandwidth: 100 Hz).

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