A5080227501- Advanced Fiber Laser Technologies
- Stellar, planetary, and galactic studies
- Photonic and Optical Devices
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Spectroscopy and Laser Applications
- Astrophysics and Star Formation Studies
- Advanced Frequency and Time Standards
- Advanced Fiber Optic Sensors
- Photonic Crystal and Fiber Optics
- Laser-Matter Interactions and Applications
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Atomic and Subatomic Physics Research
- Adaptive optics and wavefront sensing
- Solid State Laser Technologies
- Photorefractive and Nonlinear Optics
- Laser Design and Applications
- Quantum optics and atomic interactions
- Atmospheric and Environmental Gas Dynamics
- Advanced Measurement and Metrology Techniques
- Atmospheric Ozone and Climate
- Advanced Photonic Communication Systems
- Optical Polarization and Ellipsometry
- Spectroscopy Techniques in Biomedical and Chemical Research
University of Colorado Boulder
2017-2024
National Institute of Standards and Technology
2016-2024
National Institute of Standards
2018-2024
University of Colorado System
2018-2022
Bethel University
2015-2021
Shorter College
2015
Laboratory optical atomic clocks achieve remarkable accuracy (now counted to 18 digits or more), opening possibilities for exploring fundamental physics and enabling new measurements.However, their size the use of bulk components prevent them from being more widely adopted in applications that require precision timing.By leveraging silicon-chip photonics integration reduce component complexity, we demonstrate a compact optical-clock architecture.Here semiconductor laser is stabilized an...
Devices based on spectroscopy of atomic vapors can measure physical quantities such as magnetic fields, RF electric time and length, rotation have applications in a broad range fields including communications, medicine, navigation. We present type photonic device that interfaces single-mode silicon nitride optical waveguides with warm vapors, enabling precision an extremely compact (<1 cm3) package. perform rubidium confined micro-machined, 27 mm3 volume, vapor cell using collimated...
Using aluminum-nitride photonic-chip waveguides, we generate optical-frequency-comb supercontinuum spanning from 500 nm to 4000 with a 0.8 nJ seed pulse, and show that the spectrum can be tailored by changing waveguide geometry. Since aluminum nitride exhibits both quadratic cubic nonlinearities, spectra feature simultaneous contributions numerous nonlinear mechanisms: generation, difference-frequency second-harmonic third-harmonic generation. As one application of integrating multiple...
Microresonator-based soliton frequency combs, microcombs, have recently emerged to offer low-noise, photonic-chip sources for applications, spanning from timekeeping optical-frequency synthesis and ranging. Broad optical bandwidth, brightness, coherence, stability made combs important directly probe atoms molecules, especially in trace gas detection, multiphoton light-atom interactions, spectroscopy the extreme ultraviolet. Here, we explore direct microcomb atomic spectroscopy, using a...
Abstract The warm Neptune GJ 3470b transits a nearby ( d = 29 pc) bright slowly rotating M1.5-dwarf star. Using spectroscopic observations during two with the newly commissioned NEID spectrometer on WIYN 3.5 m Telescope at Kitt Peak Observatory, we model classical Rossiter–McLaughlin effect, yielding sky-projected obliquity of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>λ</mml:mi> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mrow> <mml:mn>98</mml:mn>...
Abstract Short duration, intense pulses of light can experience dramatic spectral broadening when propagating through lengths optical fibre. This continuum generation process is caused by a combination nonlinear effects including the formation dispersive waves. Optical analogues Cherenkov radiation, these waves allow pulse to radiate power into distant region. In this work, efficient and coherent wave visible ultraviolet demonstrated in silica waveguides on silicon chip. Unlike fibre...
We report accurate phase stabilization of an interlocking pair Kerr-microresonator frequency combs. The two combs, one based on silicon nitride and silica, feature nearly harmonic repetition frequencies can be generated with laser. silicon-nitride comb supports ultrafast-laser regime three-optical-cycle, 1-picosecond-period soliton pulses a total dispersive-wave-enhanced bandwidth 170 THz, while providing stable phase-link between optical microwave frequencies. demonstrate nanofabrication...
We validate the discovery of a 2 Earth radii sub-Neptune-size planet around nearby high proper motion M2.5-dwarf G 9-40 (EPIC 212048748), using high-precision near-infrared (NIR) radial velocity (RV) observations with Habitable-zone Planet Finder (HPF), precision diffuser-assisted ground-based photometry custom narrow-band photometric filter, and adaptive optics imaging. At distance $d=27.9\mathrm{pc}$, 9-40b is second closest transiting discovered by K2 to date. The planet's large transit...
The discovery and characterization of exoplanets around nearby stars is driven by profound scientific questions about the uniqueness Earth our Solar System, conditions under which life could exist elsewhere in Galaxy. Doppler spectroscopy, or radial velocity (RV) technique, has been used extensively to identify hundreds exoplanets, but with notable challenges detecting terrestrial mass planets orbiting within habitable zones. We describe infrared RV spectroscopy at 10 m Hobby-Eberly...
We confirm the planetary nature of two gas giants discovered by TESS to transit M dwarfs. TOI-3714 ($V=15.24,~J=11.74$) is an M2 dwarf hosting a hot Jupiter ($M_p=0.70 \pm 0.03~\mathrm{M_J}$ and $R_p=1.01 0.03~\mathrm{R_J}$) on orbital period $2.154849 0.000001$ days with resolved white companion. TOI-3629 ($V=14.63,~J=11.42$) M1 ($M_p=0.26 0.02~\mathrm{M_J}$ $R_p=0.74 0.02~\mathrm{R_J}$) $3.936551_{-0.000006}^{+0.000005}$ days. characterize each transiting companion using combination...
Laser frequency combs, with their unique combination of precisely defined spectral lines and broad bandwidth, are a powerful tool for basic applied spectroscopy. Here, we report offset-free, mid-infrared combs dual-comb spectroscopy through supercontinuum generation in silicon-on-sapphire waveguides. We leverage robust fabrication geometrical dispersion engineering nanophotonic waveguides multi-band, coherent spanning 70 THz the (2.5 μm–6.2 μm). Precise waveguide provides significant...
Abstract Barnard’s star is among the most studied stars given its proximity to Sun. It often considered radial velocity (RV) standard for fully convective due RV stability and equatorial decl. Recently, an <?CDATA $M\sin i=3.3{M}_{\oplus }$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>M</mml:mi> <mml:mi>sin</mml:mi> <mml:mi>i</mml:mi> <mml:mo>=</mml:mo> <mml:mn>3.3</mml:mn> <mml:msub> <mml:mrow> </mml:mrow> <mml:mo>⊕</mml:mo> </mml:msub> </mml:math>...
We present the discovery of a new Jovian-sized planet, TOI-3757 b, lowest density planet orbiting an M dwarf (M0V). It orbits solar-metallicity discovered using TESS photometry and confirmed with precise radial velocities (RV) from HPF NEID. With planetary radius $12.0^{+0.4}_{-0.5}$ $R_{\oplus}$ mass $85.3^{+8.8}_{-8.7}$ $M_{\oplus}$, not only does this object add to small sample gas giants ($\sim 10$) around dwarfs, but also, its low ($\rho =$ $0.27^{+0.05}_{-0.04}$ $\textrm{g~cm}^{-3}$)...
We confirm the planetary nature of two gas giants discovered by TESS to transit M dwarfs with stellar companions at wide separations. TOI-3984 A ($J=11.93$) is an M4 dwarf hosting a short-period ($4.353326 \pm 0.000005$ days) giant ($M_p=0.14\pm0.03~\mathrm{M_{J}}$ and $R_p=0.71\pm0.02~\mathrm{R_{J}}$) separation white companion. TOI-5293 ($J=12.47$) M3 ($2.930289 0.000004$ ($M_p=0.54\pm0.07~\mathrm{M_{J}}$ $R_p=1.06\pm0.04~\mathrm{R_{J}}$) characterize both systems using combination...
Laser frequency combs (LFCs) are an important component of Doppler radial velocity (RV) spectroscopy that pushes fractional precision to the $10^{-10}$ level, as required identify and characterize Earth-like exoplanets. However, large intensity variations across LFC spectrum arise in nonlinear broadening limit range comb lines can be used for optimal wavelength calibration with sufficient signal-to-noise ratio. Furthermore, temporal spectral-intensity fluctuations LFC, coupled flux-dependent...
view Abstract Citations (136) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS 100-MICRON Survey of the Galactic Plane Hoffmann, William F. ; Fredrick, Carl L. Emery, Roger J. A survey a portion galactic plane has been carried out at wavelength 100 with beamwidth 12' and sensitivity 1022 W Hz-i. The covers 750 square degrees sky including most between t11 = 335 tIl - 88 number other selected areas interest. Seventy-two sources have detected, 60...
Beginning with a continuous wave laser at 1064 nm, we generate 30 GHz electro-optic frequency comb which contains 100 lines spanning 3 THz. The initial is subsequently amplified, spectrally broadened in normal dispersion photonic crystal fiber, and then temporally compressed to provide 74 fs pulses average power of up 2.6 W. When launched into second fiber anomalous dispersion, supercontinuum 800-1350 nm generated. Second harmonic generation allows for extension the visible, yielding greater...
Abstract Young, rapidly rotating M dwarfs exhibit prominent starspots, which create quasiperiodic signals in their photometric and Doppler spectroscopic measurements. The periodic can mimic radial velocity (RV) changes expected from orbiting exoplanets. Exoplanets be distinguished activity-induced false positives by the chromaticity long-term incoherence of starspot signals, but these qualities are poorly constrained for fully convective stars. Coherent on may persist hundreds rotations,...
Understanding the dynamics and kinematics of out-flowing atmospheres hot warm exoplanets is crucial to understanding origins evolutionary history near evaporation desert. Recently, ground based measurements meta-stable Helium atom's resonant absorption at 10830 \AA~has become a powerful probe base environment which driving outflow exoplanet atmospheres. We report evidence for He I \AA~in (equivalent width $\sim$ $0.012 \pm 0.002$ \AA) in exosphere Neptune orbiting M-dwarf GJ 3470, during...
Precision laser spectroscopy is key to many developments in atomic and molecular physics the advancement of related technologies such as clocks sensors. However, important spectroscopic scenarios, astronomy remote sensing, light thermal origin interferometric or diffractive spectrometers typically replace spectroscopy. In this work, we employ laser-based heterodyne radiometry measure incoherent sources near-infrared introduce techniques for absolute frequency calibration with a comb....