Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 44: Laser development: Solid state lasers II

Q 44.5: Vortrag

Donnerstag, 21. März 2013, 12:00–12:15, F 128

Fabrication of distributed feedback dye lasers by direct femtosecond laser writing — •Wolfgang Horn, Sebastian Kroesen, and Cornelia Denz — Institut für Angewandte Physik, Correnstr. 2-4, 48149 Münster

In this presentation, we report the fabrication of organic distributed feedback (DFB) lasers in Rhodamin-6G-doped SU-8 negative tone photoresist by direct femtosecond laser writing.

Micro- and nanometer sized elements in photopolymers by nonlinear absorption of femtosecond radiation offers many benefits for integrated lab-on-a-chip devices. The most attractive aspect of femtosecond direct laser writing is the feasibility to create almost arbitrary three-dimensional structures by translating the host material under the laser focal point. This method allows for fabrication of light emitting devices for biophotonic and microfluidic applications with a high spatial resolution and a polymerized voxel size below the cubic wavelength of the focused femtosecond pulses.

The DFB lasers are realized by point-by-point exposure incorporating a low-order Bragg grating. A quarter-wave phase shift is included in the center of the grating section to obtain single mode operation. Different lasing wavelengths are demonstrated by varying the pitch of the feedback grating. Spectral emission, threshold and lifetime characterization is performed by pumping the laser with a pulsed, frequency double Nd:YAG laser.