We demonstrate a high sensitivity all-fiber spectroscopic methane sensor based on photothermal interferometry. With 2.4-m-long anti-resonant hollow-core fiber, 1654 nm distributed feedback laser, and Raman fiber amplifier, noise-equivalent concentration of ∼ <...

Abstract. Oxygen and hydrogen isotope ratios in polar precipitation are widely used as proxies for local temperature. In combination, oxygen also provide information on sea surface temperature at the oceanic moisture source locations where originates. Temperature reconstructions obtained from ice-core records generally rely linear approximations of relationships among temperature, water-isotope...

Neutron stars provide a unique physical laboratory to study the properties of matter at high density. We diagnostic composition high-density matter, namely, g-mode oscillations, which are driven by buoyancy forces. These oscillations can be excited tidal forces and couple gravitational waves. extend prior results for spectrum cold neutron star temperatures that expected achieved in mergers usin...