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Office of the Director

Projects/Programs

Displaying 551 - 575 of 1613
CombSpec1

Frequency Comb Spectroscopy

Ongoing
Erbium mode-locked fiber lasers are a mature technology that provide a means to build robust optical frequency combs centered near 1550 nm. One research focus of our group is to extend the optical bandwidth of Er fiber-based combs into the near- to mid-infrared wavelength region of 1000 to 5000 nm...
single_photon_QFT_schematic

Frequency Conversion Interfaces for Photonic Quantum Systems

Ongoing
Our research on quantum frequency conversion follows two main tracks. First, we combine relatively mature frequency conversion technology based on periodically-poled lithium niobate waveguides with quantum light generated by single semiconductor quantum dots in proof-of-principle experiments that...
NIST FMAS

Frequency Measurement and Analysis Service (FMAS)

Ongoing
Subscribers to the NIST service receive a complete frequency measurement system which includes everything needed to make precision frequency measurements that are traceable to NIST. An easy-to-read instruction manual makes installation a snap. Once the system is installed, it's easy to get started...
dual-comb spectroscopy illustration

Frequency-comb-based Spectroscopy (Dual-Comb Spectroscopy)

Ongoing
Fully stabilized frequency combs provide a broadband spectral output that is comprised of a series of narrow spectral lines or “teeth”. “Dual comb spectroscopy” provides one method to harness these properties for broadband spectroscopy. It allows the user to read-out the spectrum of a gas mixture on...
Figure4

Functional Analysis of Variance

Ongoing
Assessment of measurement data often raises statistical inference questions which have not been adequately addressed in the statistical literature. For example, NIST scientists may encounter issues on whether two measurement techniques give arise to similar measurement curves, whether there is a...
Cube test

Functional Barriers for Low-Flammability Products

Ongoing
This project enables low-flammability products without flame retardants by providing methods to assess functional barriers, advancing their performance, and exploring their use in multi-layer products for critical applications.

Functional Recovery of Buildings and Lifelines

Ongoing
Objective To improve the recovery time of buildings and lifeline infrastructure by strengthening the design of the built environment to withstand future earthquake impacts, considering economic and implementation issues, providing a standard framework for the U.S. construction industry to deliver...
schematic diagram

Fundamental Constants in Nature

Ongoing
The Task Group on Fundamental Constants periodically publishes updated evaluations of the fundamental constants of physics and chemistry. These evaluations serve two purposes. First, they provide a self-consistent set of recommended values of the constants for all to use. Second, because they...
Fundamental Electromagnetic Technologies and Standards

Fundamental Electromagnetic Technologies and Standards

Ongoing
This focus area develops theory, metrology, and standards for the technologies upon which the future of both wired and wireless communications depends. These developments are then leveraged to provide better measurement services to U.S. industry through extended frequency range, lowered uncertainty...

Fundamental Guided Wave Metrology

Ongoing
The science of microwave measurements is expanding in many different directions. There is a constant push to use higher frequencies. Signals are becoming much more complex and include modulation effects, multiport/differential signals, complex waveforms, and other unusual signal schemes. On-wafer...

Fundamental Interaction Mechanisms of Engineered Nanomaterials with DNA

Completed
Intended impact Nanotechnology research has resulted in the rapid creation of engineered nanomaterials with many foreseeable applications in medical imaging/diagnosis and in drug delivery. However, there is a notable scarcity of both acute and chronic human toxicity data for these new materials...

Fundamental Measurements for Metal Additive Manufacturing

Ongoing
Objective The objective of this project is to instill confidence and aid adoption of AM as a viable technology for production in critical applications. To achieve this goal, a strong understanding of how to measure, characterize and qualify AM parts, processes, and feedstock materials is required...

Fundamental Metrology for Communications

Ongoing
Engineers designing the next generation of wireless applications and devices must work around the fundamental issue of radio interference. NIST CTL’s RF Technology High Speed Electronics group focuses on fundamental measurement and modeling of nonlinear microwave systems, devices and materials that...
electric field signal graph

Fundamental Physics: Electric Field Imaging with Neutrons

Completed
An effective magnetic field B eff arises from the relativistic transformation of an electric field E into the frame of reference moving at the neutron velocity v; B eff is proportional to v x E /c 2, hence is small due to the factor of the square of the speed of light in the denominator. This...
NG-6 beam line

Fundamental Physics: Experiments with a Precision Neutron Polarimeter

Ongoing
The NSR neutron polarimeter has limited two separate physical quantities, spin rotation due to parity non-conservation and long-range spin-dependent interactions. Firstly, we completed a successful run of an experiment to study the strong interaction using weak interaction properties of the neutron...
magnetic trap

Fundamental Physics: Magnetically Trapped Neutron Lifetime Experiment

Completed
A precise value for the neutron lifetime is required for several internal consistency tests of the SM including searches for right-handed currents and tests of the unitarity of the CKM mixing matrix. Measurements of neutron decay coefficients provide information on the vector and axial-vector...
NG-C beamline

Fundamental Physics: Neutron Lifetime Measurement Using a Cold Neutron Beam

Ongoing
In the beam technique, the lifetime is measured by counting the absolute number of protons within a fiducial volume while continuously monitoring the absolute neutron flux. We completed the first experiment in 2003, and the uncertainty in the result was dominated by systematic effects associated...
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