Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 23: Photonics I
Q 23.1: Talk
Monday, March 11, 2019, 16:15–16:30, S Ex 04 E-Tech
Optomechanical saturable cavity output coupler — •Carol Bibiana Rojas Hurtado1, Johannes Dickmann1, Walter Dickmann2, and Stefanie Kroker1,2 — 1Physikalisch-Technische Bundesanstalt — 2Technische Universität Braunschweig
We present a concept for saturable output couplers based on a nonlinear mirror with optomechanical saturable response. The mirror consists of a nanostructured silicon surface with two layers of subwavelength gratings. The interaction between the optical forces induced by the incoming light field and the structural deformations lead to a nonlinear response of the mirror, whose reflectivity can be modulated passively directly inside a resonator. The nonlinear response shows a saturable behavior, the surface's reflectivity increases for high intensities meaning that the resonator losses decreases for high intensities. This approach is an alternative to current saturable absorbers made of quantum dots, graphene, dyes, semiconductors and devices based on Kerr lensing or nonlinear crystals. We investigate the requirements for the mirror to be used for passive pulse generation, especially Q-switching, as the bandwidth, modulation depth, saturation intensity and recovery time, and show that most of these properties can be designed at will depending on the application. Furthermore, the non-saturable losses can be totally minimized in contrast to the existing losses in saturable absorbers.