High Finesse Fiber Fabry-Perot Cavities: Stabilization and Mode Matching Analysis

Fiber Fabry-Perot cavities, formed by micro-machined mirrors on the end-facets of optical fibers, are used in an increasing number of technical and scientific applications, where they typically require precise stabilization of their optical resonances. Here, we study two different approaches to construct fiber Fabry-Perot resonators and stabilize their length for experiments in cavity quantum electrodynamics with neutral atoms. A piezo-mechanically actuated cavity with feedback based on the Pound-Drever-Hall locking technique is compared to a novel rigid cavity design that makes use of the high passive stability of a monolithic cavity spacer and employs thermal self-locking and external temperature tuning. Furthermore, we present a general analysis of the mode matching problem in fiber Fabry-Perot cavities, which explains the asymmetry in their reflective line shapes and has important implications for the optimal alignment of the fiber resonators. Finally, we discuss the issue of fiber-generated background photons. We expect that our results contribute towards the integration of high-finesse fiber Fabry-Perot cavities into compact and robust quantum-enabled devices in the future.Comment: The Supplemental Material is included in the source code of the article that can be downloaded from this arXiv page (see "Other formats"). Peer-reviewed version with changes to text and figure

Understanding the effects of N-terminal acetylation on the oligomeric state of Tau

Protein production, purification, and analysis done in order to find the effects of N-terminal acetylation on microtubule associated protein tau

Improving Unsegmented Dialogue Turns Annotation with N-gram Transducers

PACLIC 23 / City University of Hong Kong / 3-5 December 200

Determinants of Nutritional Differences in Mediterranean Rural Spain, 1840-1965 Birth Cohorts: A Comparison between Irrigated and Dry Farming Agriculture

Anthropometric studies have given much attention to the impact of industrialization and urbanization on the biological standards of living of urban populations. Instead, we know less about the evolution of height and the disparities within the rural world and how they have changed during the modern economic growth process. This article analyzes the evolution and the determining factors that would explain the inequality of the biological welfare of a group of rural populations in Mediterranean Spain. Using a database of the heights of military conscripts (N = 146, 041) of the study area, a comparison is made of the biological well-being of the cohorts born between 1840 and 1965 in different rural environments (irrigated vs. dry farming). The results show that the recruits residing in irrigated areas were taller than those in dry farming areas and that the nutritional differences were greater among the latter. The advantage of the heights in irrigated areas widened with the development of commercial agriculture at the end of the nineteenth century and, although it began to reduce from the early decades of the twentieth century, the anthropometric gap persisted throughout the period analyzed. The data also suggest that the distribution of income was also more unequal in the dry farming areas, where the diet was less varied and rich than in the irrigated areas. This situation could be largely explained by the existence of low productivity agriculture in these dry farming areas, among other possible factors

Evolución de la competitividad y rentabilidad del cultivo del tomate rojo (lycopersicon esculentum l.) en Sinaloa, México

El tomate rojo mexicano es una de las hortalizas que generan más divisas para el país, ya que cerca de 30% de la producción nacional se exporta, principalmente a los Estados Unidos de Norteamérica (EE.UU.), por lo que su cultivo depende significativamente del comportamiento del mercado internacional. En este estudio se planeó el siguiente objetivo: analizar la rentabilidad, la competitividad y la ventaja comparativa del cultivo del tomate rojo en Sinaloa en el ciclo agrícola 1999/2000, para lo cual se utilizó la metodología de la Matriz de Análisis de Política (MAP) desarrollada por Monke y Pearson (1989)