Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session H69: Optical Frequency Comb SpectroscopyInvited
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Sponsoring Units: DLS Chair: Kristan Corwin, Kansas State University Room: BCEC 052A |
Tuesday, March 5, 2019 2:30PM - 3:06PM |
H69.00001: Tri-comb Spectroscopy Invited Speaker: Steven Cundiff Optical multidimenisonal coherent spectroscopy (MDCS) has been developed over the last 20 years and proven very powerful at unfolding congested spectra, identifying coupling between resonances, making size-resolved measurements of nanoparticles and revealing many-body interactions [1]. However, MDCS has required a complex apparatus and has suffered from limited spectral resolution. |
Tuesday, March 5, 2019 3:06PM - 3:42PM |
H69.00002: Widely tunable cavity-enhanced ultrafast spectroscopy and the dynamics of hydrogen bond networks. Invited Speaker: Thomas Allison Ultrafast optical spectroscopy methods, such as transient absorption spectroscopy and 2D spectroscopy, are widely used across many disciplines. However, these techniques are typically restricted to optically thick samples, such as solids and liquid solutions. In previous work [Reber et al. Optica 3, 311 (2016)], using frequency comb lasers and resonant optical cavities, we have demonstrated the extension of all-optical ultrafast spectroscopy methods to dilute molecular beams and recorded transient absorption signals with detection limits as low as ΔOD = 2×10-10. In this talk I will discuss our progress in developing widely tunable cavity-enhanced ultrafast spectrometers operating from the ultraviolet to the mid-infrared and their application to the ultrafast dynamics of elementary hydrogen bond networks. |
Tuesday, March 5, 2019 3:42PM - 4:18PM |
H69.00003: Multi-comb coherent control for material studies Invited Speaker: Kaoru Minoshima Dual-comb spectroscopy (DCS), which uses two frequency combs with slightly different repetition frequencies, has become a powerful tool for high-precision spectroscopy because of its capability for rapid, broadband, high-resolution, and high-sensitivity measurement. Recently, the applicability of the DCS has greatly expanded to such as nonlinear spectroscopy and solid-state study. By utilizing the DCS as the tool to retrieve the dynamical response of the electric field of the optical wave in the sub-PHz frequency domain, we can directly obtain the complex optical properties of the materials as the response function, which provides an attractive tool for direct characterization of new materials without model assumption. We have applied the technique for direct characterization of the complex optical properties of solid materials [1] and studying ultrafast phenomena [2]. |
Tuesday, March 5, 2019 4:18PM - 4:54PM |
H69.00004: Soliton microresonator frequency combs Invited Speaker: Tobias Kippenberg Optical frequency combs1,2 provide equidistant markers in the IR, visible and UV and have become a pivotal tool for frequency metrology and are the underlying principle of optical atomic clocks, but are also finding use in other areas, such as broadband spectroscopy or low noise microwave generation. Development are underway to create chip-scale frequency comb sources[1] that are low power, compatible with wafer scale processing, exhibit microwave repetition rates, for applications that are airborne or in space. Such “micro-combs” are based on parametric frequency conversion of a continuous wave laser, and make use of dissipative Kerr soliton formation[2][3] [4] (DKS). Such dissipative Kerr solitons provide access to fully coherent and broadband combs with tailorable bandwidth. In this talk the Physics of dissipative solitons is reviewed, as discovered in crystalline resonators. Microcombs, give rise to a host of nonlinear dynamical phenomena, including Soliton Cherenkov radiation[5], breather solitons[6], soliton switching[7], to soliton crystals[8], and multi-soliton complexes. In addition soliton microcombs have been applied in massively parallel coherent communication[9], dual comb distance measurements[10], with record acquisition rate, and exhibit a bandwidth that can be extended to the biological imaging window. Soliton microcombs have the potential to advance timekeeping, and make frequency metrology ubiquitous. |
Tuesday, March 5, 2019 4:54PM - 5:30PM |
H69.00005: Dual Comb Spectroscopy for Emissions Measurements Invited Speaker: Eleanor Waxman Trace gas measurements are critical for understanding city contributions to greenhouse gas emissions and for identifying and quantifying natural gas leaks from oil and gas wells. Here we present a near-infrared dual frequency comb spectroscopy system that we use for trace gas measurements. Our system is comprised of a dual comb spectroscopy instrument, a telescope and co-located detector, and a retroreflector located at the far end of our measurement path. This enables us to measure over path lengths of several hundred meters to several kilometers. We have compared this system against a near-identical system over the open atmosphere with excellent agreement of retrieved trace gas concentrations. We then deployed this system at NIST to measure the carbon dioxide enhancement over the city of Boulder, Colorado which we primarily attribute to vehicle exhaust. This is coupled with Gaussian plume modeling to estimate the emissions from the city and we have good agreement with the city estimate of vehicle emissions. Finally, we deploy the system in the field in a van to measure emissions from a simulated natural gas leak using a mobile UAS-mounted retroreflector. This work shows the promise of using horizontal column-integrated open-path measurements for emissions quantification. |
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