Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 39: Poster: Quantum Optics and Photonics II

Q 39.19: Poster

Dienstag, 6. März 2018, 16:15–18:15, Zelt Ost

Coherent combination of blue-green laser diodes for direct pumped Ti:Sapphire laser power scaling — •Mario Niebuhr, Axel Heuer, and Markus Gühr — Institute for Physics and Astronomy, Uni Potsdam, Germany

Direct diode pumped solid state lasers have been an important step towards smaller, more efficient and cheaper laser sources. Ti:Sapphire systems, one of the most important sources in the ultra-short community, unfortunately need a blue-green pump not easily accessible to laser diodes (LDs). While first concepts with blue LDs have been around for some time [1], even more recent experiments with multiple, more suitable green LDs [2] show only moderate output powers.

One reason would be that single emitter LDs are limited to either high output powers and a bad beam profile or vice versa due to geometrically constraints of their structure. This problem can be resolved by coupling multiple low power LDs with a passive coherent scheme. It would yield good beam profiles similar to a single emitter but with scalable output power compared to an incoherent approach such as in [2]. We will show first results of coherent coupling of two green LDs with 1 W of output power each using diffractive Dammann grating structures [3] written e.g. in volume Bragg gratings. In these first experiments, the grating structures will be emulated with a spatial light modulator for flexibility.

[1] Roth et al., Optics Letters, 34, 21 (2009)

[2] Gürel et al., Optics Express, 23, 23 (2015)

[3] Dammann et al., Optics Communications, 3, 5 (1971)