Karsten Danzmann

TL;DR: In this article, the authors demonstrate a reduction of the tilt-to-length coupling between a flat-top beam generator and a Gaussian reference beam via introducing two-and four-lens imaging systems.

TL;DR: An active power stabilization of a Nd:YAG laser employing the optical ac-coupling scheme is demonstrated and its fundamental quantum limit is derived and is 3 dB better than the one encountered in traditional power stabilization schemes.

TL;DR: In this article, a measurement scheme suitable to sense non-reciprocal phase changes was presented, as well as results obtained using this setup on samples of commercially available fibers. But the experimental setup for the fiber characterization consists of a quasi-monolithic interferometer which constitutes a representative cut-out of the local interferometry on-board LISA concerning the fiber.

TL;DR: In this article, the authors obtain theoretically the optimal feedback controller that minimizes the uncertainty for a general linear measurement process, and show that even in the absence of classical noise, a pure quantum state is not always achievable via feedback.

TL;DR: In this article, a new set of data obtained from direct measurements of momentum transfer to a spacecraft from individual particle impacts is presented, which can be used to detect impacts and measure properties such as the transferred momentum, direction of travel, and location of impact on the spacecraft.