Publications by authors named "K Sengstock"
Article Synopsis
- Imaging is crucial for understanding physical systems at the microscopic level, with new techniques revealing novel phenomena.
- Ultracold atoms in optical lattices face limitations from diffraction, high optical density, and restricted depth of focus, making them primarily useful for 2D systems.
- A new imaging method utilizes matter wave optics to enhance density distribution visibility in 3D systems, allowing for detailed manipulation and insight into quantum many-body phenomena, paving the way for advanced studies in this field.
Bose-Einstein condensates (BECs) in free fall constitute a promising source for space-borne interferometry. Indeed, BECs enjoy a slowly expanding wave function, display a large spatial coherence and can be engineered and probed by optical techniques. Here we explore matter-wave fringes of multiple spinor components of a BEC released in free fall employing light-pulses to drive Bragg processes and induce phase imprinting on a sounding rocket.
View Article and Find Full Text PDFArticle Synopsis
- Plasma dynamics relies heavily on controlled experiments to validate theoretical models, as density and temperature are key factors.
- An ultracold plasma is formed by ionizing atoms in a Rb Bose-Einstein condensate using a femtosecond laser pulse, creating a strongly coupled plasma in a unique regime.
- The study observes rapid electron cooling in this setup, with temperatures decreasing from 5250 K to below 10 K in under 500 ns, showcasing a cooling rate of 400 K per picosecond.
A cavity optomechanical locking scheme based on the optical spring effect.
Rev Sci Instrum
October 2020
We present a novel locking scheme for active length-stabilization and frequency detuning of a cavity optomechanical device based on the optical spring effect. The error signal is generated by utilizing the position measurement of a thermally driven intra-cavity nanomechanical device and employing its detuning-dependent frequency shift caused by the dispersive coupling to the cavity field. The scheme neither requires external modulation of the laser or the cavity nor does it demand for additional error signal readout, rendering its technical implementation rather simple for a large variety of existing optomechanical devices.
View Article and Find Full Text PDFWe present an optical element for the separation of superimposed beams that only differ in angle. The beams are angularly resolved and separated by total internal reflection at an air gap between two prisms. As a showcase application, we demonstrate the separation of superimposed beams of different diffraction orders directly behind acousto-optic modulators for an operating wavelength of 800 nm.
View Article and Find Full Text PDF