arXiv subjects

Xiaoman Huang

Publications and source records attributed to Xiaoman Huang.

3 recordsLinked to original sources

arXiv2026

DC response of an interferometer topology with an L-shaped cavity: a tabletop study

A new interferometer topology for kilohertz gravitational-wave detection was recently proposed in [Zhang et al. Phys. Rev. X 13, 021019 (2023)]. The design is based on an L-shaped optical cavity pumped through a Sagnac-like vortex. We report a tabletop experiment that characterizes the interferometer's optical response near DC. When the laser frequency is locked to the resonance of the L-shaped cavity, we observe that the cavity input coupler becomes effectively transparent, yielding a simple Michelson-like response. Moreover, the Sagnac vortex separates into upper and lower paths, which behave as two independent pumping paths driving the cavity. These observations are in agreement with theoretical predictions. Our results provide an intuitive physical picture of this interferometer topology and offer insight into its lock acquisition strategy.

physics.ins-det↗

arXiv2025

Beijing Normal University 12-meter Interferometric kHz GW Detector Prototype: Design and Scientific Prospects

Current gravitational-wave detectors have achieved remarkable sensitivity around 100 Hz, enabling ground-breaking discoveries. Enhancing sensitivity at higher frequencies in the kilohertz (kHz) range promises access to rich physics, particularly the extreme conditions during the merger stage of binary neutron stars. However, the high-frequency sensitivity of Michelson-based interferometers is fundamentally limited by their linear optical cavities, which are optimized for low-frequency signal enhancement. In [Phys. Rev. X 13, 021019 (2023)], a new configuration employing an L-shaped optical resonator was proposed to overcome this limitation, offering exceptional sensitivity in the kHz band. As a pathfinder, the 12-meter prototype at Beijing Normal University is designed to demonstrate the sensing and control schemes of this new kHz detector configuration and to explore its performance in the high-power regime with suspended optics. Beyond its primary scientific goal, the prototype also offers potential sensitivity in the megahertz (MHz) range, potentially enabling constraints on exotic sources. This paper presents an overview of the prototype, including its optical design and current development status of key components.

physics.optics↗

arXiv2015

A Bayesian Change Point Model for Detecting Land Cover Changes in MODIS Time Series

As both a central task in Remote Sensing and a common problem in many other situations involving time series data, change point detection boasts a thorough and well-documented history of study. However, the treatment of missing data and proper exploitation of the structure in multivariate time series during change point detection remains lacking. Multispectral, high temporal resolution time series data from NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) instruments provide an attractive and challenging context to contribute to the change point detection literature. In an effort to better monitor change in land cover using MODIS data, we present a novel approach to identifying periods of time in which regions experience some conversion-type of land cover change. That is, we propose a method for parameter estimation and change point detection in the presence of missing data which capitalizes on the high dimensionality of MODIS data. We test the quality of our method in a simulation study alongside a contemporary change point method and apply it in a case study at the Xingu River Basin in the Amazon. Not only does our method maintain a high accuracy, but can provide insight into the types of changes occurring via land cover conversion probabilities. In this way we can better characterize the amount and types of forest disturbance in our study area in comparison to traditional change point methods.

stat.AP↗