Integrated-optical q-switching and mode-locking of a Nd3+-doped fiber-laser

G. Geister

doi:10.1117/12.22202

1 July 1990 Integrated-optical q-switching and mode-locking of a Nd³⁺-doped fiber laser

G. Geister

Proceedings Volume 1319, Optics in Complex Systems; (1990) https://doi.org/10.1117/12.22202
Event: 15th International Optics in Complex Systems, 1990, Garmisch, Germany

Abstract

RareEarth doped silica fibers are interesting light sources for optical communications and sensor applications. Their broad fluorescence linewidth and the long spontaneous lifetime of the upper laser level otter the possibility to produce short and intense light pulses. We demonstrate pulsed operation of a Nddoped fiber laser with an asymmetric switched directional coupler operating as an intracavity intensity . modulator. 1 . Fiberlaser configuration The fiberlaser arrangement is shown in Fig. 1 . The prepared modulator is an xcut LiNbO3substrate with a pair of indiffused Tistripe waveguides of 5 pm width which are singlemode at the lasing wavelength A 1088 nm. The minimum waveguide separation is 2 im and has 8 mm length. One single pair of 8 mm long Alelectrodes with a 10 pm gap deposited onto the substrate surface is placed asymmetrically relative to the waveguides. This electrode arrangement provides electrooptic modulation of the phase mismatch between the two waveguides via the strong electrooptic coefficient rss of the LiNbO3 crystal. The modulator chip is Lw 20 mm long. The singlemode Ndfiber with LF 3. 485 m is pumped at a wavelength A 825 nm and butt coupled to the modulator. At the buttjoint the faces are angledcut with angles Yr 1 1. and yp. 7. 5 so no residual cavities exist within the laser resonator. The laser cavity is defined by dielectric coatings on the free ends of

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G. Geister "Integrated-optical q-switching and mode-locking of a Nd³⁺-doped fiber laser", Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); https://doi.org/10.1117/12.22202

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