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Physics Programs & Projects

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Active Interrogation Standards
Last Updated Date: 08/18/2015

Active interrogation involves directing nuclear radiation into a closed container and measuring secondary radiations to gain information about the … more

NIST-on-a-Chip in the ADI Group
Last Updated Date: 08/18/2015

We are developing core technology tools to enable chip-scale standards that realize a broad range of base and derived SI units in compact, … more

Optical and Microwave Waveform Synthesis
Last Updated Date: 08/18/2015

We use femtosecond-laser frequency combs to generate optical and microwave waveforms with unprecedented noise performance.     more

Air Speed Metrology
Last Updated Date: 08/18/2015

NIST’s versatile wind tunnel is used to calibrate customers’ air speed sensors and to conduct research on the design of novel anemometers, the … more

Support of the Navy Dosimetry Program
Last Updated Date: 08/18/2015

The U.S. Navy uses thermoluminescent dosimeters (TLDs) to monitor personnel for radiation exposure.

Calcium Optical Beam Clock
Last Updated Date: 08/18/2015

A simple, compact alternative to the highest performing optical standards, the Ca clock uses a thermal beam of neutral atoms with one or two … more

Optical Cavities for Laser Stabilization
Last Updated Date: 08/18/2015

Optical cavities are essential elements of optical atomic clocks, as they serve to pre-stabilize the clock laser. Our Group is currently … more

Microresonator Device Research
Last Updated Date: 08/18/2015

With micro-resonators (fabricated in house or by collaborators) we are developing microcombs, integrated reference cavities and low-noise laser … more

Hyperspectral Microscopy
Last Updated Date: 08/18/2015

Hyperspectral imagery (HSI) microscopy allows for vegetation and geologic material to be examined at the sub-centimeter spatial scale.

Frequency Comb Spectroscopy
Last Updated Date: 08/17/2015

We use frequency combs based on ultrafast mode-locked lasers to perform precision spectroscopy in the near- and mid-infrared domains, for rapid, … more

Pushing and Understanding the Limits of Spin-Exchange Optical Pumping of He-3
Last Updated Date: 08/17/2015

Neutron spin filters based on polarized 3He rely on the strong spin dependence of the absorption of neutrons by 3He gas.

X-ray Detection with Large Area Avalanche Photodiodes for the Neutron Radiative Decay Experiment
Last Updated Date: 08/17/2015

Operation of the second neutron radiative decay experiment has been completed. In this experiment we observed the emission of photons that … more

Frequency Comb Calibration of Astronomical Spectrographs
Last Updated Date: 08/17/2015

We have constructed portable frequency combs that have provided in situ calibration of astronomical spectrographs, to aid in the search for … more

Californium Neutron Irradiation Facility
Last Updated Date: 08/17/2015

NIST maintains the Californium Neutron Irradiation Facility (CNIF), which is an exposure facility providing fast neutrons for irradiations … more

Precision Measurement of the Branching Ratio and Energy Spectrum of Radiative Neutron Decay
Last Updated Date: 08/17/2015

Neutron beta-decay is typically considered as a three-body process, but it is always accompanied by inner-bremsstrahlung soft photons, n → e − + p … more

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