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Mode-locked Nd-doped microstructured fiber laser

Mathias Moenster, Peter Glas, Günter Steinmeyer, and Rumen Iliew

Open Access Open Access

Abstract

We demonstrate passive mode-locking of a microstructured fiber laser for the first time. The Nd-doped microstructured fiber exhibits a reduced dispersion at 1060 nm. A semiconductor saturable absorber mirror is used for passive mode-locking. Stable pulse formation with a pulse duration of about 26 ps and a pulse energy of 0.7 nJ is observed.

©2004 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. Set-up of the mode-locked Nd:MSF laser. The solid beam represents the laser signal whereas the red outlined beam indicates the pump signal. M1, dichroic mirror (butt-coupled); M2, output coupler, ports A and B; L1, L2, L3 focusing lenses. The inset shows an scanning-electron micrograph of the Nd:MSF cross-section. d air hole diameter, Λ pitch.

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Fig. 2.
Fig. 2. Calculated group velocity dispersion vs. wavelength. At the lasing wavelength, which is represented by the dashed line, the MSF still operates in the normal GVD regime. The calculation was carried out based on the measured MSF geometry (cf. inset in Fig. 1).

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Fig. 3.
Fig. 3. Radio frequency spectrum of the first intermode beatnote at f R = 56 MHz. Resolution bandwidth is 1 kHz. The linewidth of the beatnote is ≤ 500Hz (FWHM) at the resolution limit. The modulation sidebands at ± 1 MHz are ≥ 38 dB below the carrier.

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Fig. 4.
Fig. 4. Intensity autocorrelation function of the mode-locked pulse train with a duration of 30ps (FWHM). The inset shows the decorrelated intensity profile of the pulse [16]. The reconstructed pulse width is 26ps (FWHM).

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Fig. 5.
Fig. 5. Mode-locked spectrum measured at a resolution of 0.2 nm. The center wavelength is ~ 1060 nm. The spectral width is ~ 7 nm (FWHM).

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