A5037348759- Advanced Fiber Laser Technologies
- Spectroscopy and Laser Applications
- Advanced Frequency and Time Standards
- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Photonic Crystal and Fiber Optics
- Atomic and Subatomic Physics Research
- Mass Spectrometry Techniques and Applications
- Laser-Matter Interactions and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Laser Design and Applications
- Solid State Laser Technologies
- Advanced Optical Sensing Technologies
- Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Quantum optics and atomic interactions
- Advanced Chemical Sensor Technologies
- Analytical Chemistry and Sensors
- Optical Coherence Tomography Applications
- Quantum, superfluid, helium dynamics
- Air Quality Monitoring and Forecasting
- Scientific Measurement and Uncertainty Evaluation
- Insect Pheromone Research and Control
National Institute of Standards and Technology
2015-2024
E-Spectrum Technologies (United States)
2024
Communications Technology Laboratory
2024
National Institute of Standards
2003-2023
Goddard Space Flight Center
2022
Physical Measurement Laboratory
2017-2020
University of Colorado Boulder
1995-2020
Honeywell (United States)
2020
Université Laval
2019
Joint Institute for Laboratory Astrophysics
1993-2017
Dual-comb spectroscopy is an emerging new spectroscopic tool that exploits the frequency resolution, accuracy, broad bandwidth, and brightness of combs for ultrahigh-resolution, high-sensitivity broadband spectroscopy. By using two coherent combs, dual-comb allows a sample's spectral response to be measured on comb tooth-by-tooth basis rapidly without size constraints or instrument limitations conventional spectrometers. This review describes summarizes current state art. As technology...
Time has always had a special status in physics because of its fundamental role specifying the regularities nature and extraordinary precision with which it can be measured. This enables tests cosmology, as well practical applications such satellite navigation. Recently, regime operation for atomic clocks based on optical transitions become possible, promising even higher performance. We report frequency ratio two fractional uncertainty 5.2 × 10 –17 . The aluminum mercury single-ion clock...
The broadband, coherent nature of narrow-linewidth fiber frequency combs is exploited to measure the full complex spectrum a molecular gas through multiheterodyne spectroscopy. We absorption and phase shift experienced by each 155 000 individual frequency-comb lines, spaced 100 MHz spanning from 1495 1620 nm, after passing hydrogen cyanide gas. measured agrees with Kramers-Kronig transformation spectrum. This technique can provide rapidly, over wide bandwidths, hertz-level accuracy.
The spin structure function of the neutron gn1 has been determined over range 0.03<x<0.6 at an average Q2 2 (GeV/c)2 by measuring asymmetry in deep inelastic scattering polarized electrons from a 3He target energies between 19 and 26 GeV. integral is found to be F10gn1(x)dx=-0.022±0.011. Earlier reported proton results together with Bjorken sum rule predict F10gn1(x)dx=-0.059±0.019.Received 1 April 1993DOI:https://doi.org/10.1103/PhysRevLett.71.959©1993 American Physical Society
Broadband noise on supercontinuum spectra generated in microstructure fiber is shown to lead amplitude fluctuations as large 50% for certain input laser pulse parameters. We study this using both experimental measurements and numerical simulations with a generalized stochastic nonlinear Schrödinger equation, finding good quantitative agreement over range of input-pulse energies chirp values. This arise from amplification two quantum inputs: the shot spontaneous Raman scattering down fiber.
A phase-locked frequency comb in the near infrared is demonstrated with a mode-locked, erbium-doped, fiber laser whose output amplified and spectrally broadened dispersion-flattened, highly nonlinear optical to span from 1100 >2200 nm. The supercontinuum comprises spacing set by repetition rate an offset carrier-envelope frequency, which detected standard f-to-2f heterodyne technique. are phase locked stable rf signal stretcher cavity control of pump power, respectively. This permits...
Increasing our understanding of regional greenhouse gas transport, sources, and sinks requires accurate, precise, continuous measurements small enhancements over long ranges. We demonstrate a coherent dual frequency-comb spectroscopy technique capable achieving these goals. Spectra are acquired spanning 5990 to 6260 cm−1 (1600–1670 nm) covering ∼700 absorption features from CO2, CH4, H2O, HDO, CO213, across 2 km path. The spectra have sub-1-kHz frequency accuracy, no instrument lineshape,...
We present theoretical predictions and experimental measurements for the achievable phase noise, timing jitter, frequency stability in coherent transport of an optical over a fiber-optic link. Both technical fundamental limitations to transfer are discussed. Measurements carrier links ranging from 38 251 km demonstrate good agreement with theory. With appropriate design bidirectional on single fiber, instability at short times can reach limit imposed by delay-unsuppressed noise fiber link,...
Two frequency combs can be used to measure the full complex response of a sample in configuration which alternatively viewed as equivalent dispersive Fourier transform spectrometer, infrared time domain or multiheterodyne laser spectrometer. This dual comb spectrometer retains accuracy and resolution inherent sources. We discuss, detail, specific design our coherent dual-comb demonstrate potential this technique by measuring first overtone vibration hydrogen cyanide, centered at 194 THz...
We demonstrate a high-accuracy dual-comb spectrometer centered at 3.4 \mu m. The amplitude and phase spectra of the P, Q, partial R-branch methane {\nu}3 band are measured 25 MHz to 100 point spacing with ~kHz resolution signal-to-noise ratio up 3500. A fit absorbance yield center frequency 132 rovibrational lines. systematic uncertainty is estimated be 300 kHz, which 10-3 Doppler width tenfold improvement over Fourier transform spectroscopy. These data first high- accuracy molecular...
We describe the design, fabrication, and performance of a self-referenced, optically coherent frequency comb. The system robustness is derived from combination an optics package based on polarization-maintaining fiber, saturable absorbers for mode-locking, high signal-to-noise ratio (SNR) detection control signals, digital feedback stabilization. output phase-coherent over 1-2 μm octave-spanning spectrum with pulse repetition rate ∼200 MHz residual pulse-to-pulse timing jitter &lt;3 fs...
Identification and quantification of trace-gas sources is a major challenge for understanding regulating air quality greenhouse gas emissions. Current approaches provide either continuous but localized monitoring, or quasi-instantaneous “snapshot-in-time” regional monitoring. There need emissions detection that provides both coverage, because sinks can be episodic spatially variable. We field deploy dual frequency comb laser spectrometer the first time, enabling an observing system over...
We discuss experimental and theoretical aspects of a low-noise fiber-laser frequency comb, including the configuration major contributions to noise linewidth individual comb modes. Intracavity sources acting on mode-locked laser determine free-running include environmental changes, pump noise, amplified spontaneous emission (ASE). Extracavity outside typically signal-to-noise ratio lines effects, shot generated during supercontinuum generation. Feedback strongly suppresses these intracavity...
The neutron longitudinal and transverse asymmetries A1n A2n have been extracted from deep inelastic scattering of polarized electrons by a He3 target at incident energies 19.42, 22.66, 25.51 GeV. measurement allows for the determination spin structure functions g1n(x, Q2) g2n(x, over range 0.03<x<0.6 an average Q2 2 (GeV/c)2. data are used evaluation Ellis-Jaffe Bjorken sum rules. function is small negative within our measurement, yielding integral ∫0.030.6g1n(x)dx=−0.028±0.006 (stat)±0.006...
Coherent dual comb spectroscopy can provide high-resolution, high-accuracy measurements of a sample response in both magnitude and phase. We discuss the achievable signal-to-noise ratio (SNR) due to additive white noise multiplicative noise, corresponding sensitivity limit for trace gas detection. show that sequential acquisition overall spectrum through tunable filter, or parallel detector array, significantly improve SNR under some circumstances. identify useful figure merit as quality...
We transfer an optical frequency over 251 km of fiber with a residual instability 6x10(-19) at 100 s. This and the associated timing jitter are limited fundamentally by noise on link length. give simple expression for calculating achievable link. Transfer stability this long distance requires highly coherent source, provided here cw laser locked to high finesse cavity. A sufficient carrier signal is delivered remote end incorporating two-way, in-line erbium-doped amplifiers balance 62 dB loss.