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Physics Programs & Projects

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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

Reflectance Measurements of Human Skin
Last Updated Date: 08/17/2015

The purpose of this human subjects study is to collect high-quality measurements of the reflectance spectrum of human skin and assess the … more

Hyperspectral Image Projector (HIP)
Last Updated Date: 08/17/2015

Detecting climate change with remote sensing instruments, providing state-of-the-art surveillance imagery for security and defense, or getting the … more

Aperture area measurements
Last Updated Date: 08/17/2015

Radiometric and photometric measurements require defining apertures. The accuracy to which these measurements can be accomplished requires … more

Diffuse Optical Properties of Materials
Last Updated Date: 08/17/2015

Diffuse optical properties are critical parameters for understanding the interaction of light with tissues and other optically diffusive materials. more

Standard Reference Data on Radiation Interactions
Last Updated Date: 08/17/2015

NIST is in its seventh decade of providing critically evaluated, comprehensive databases of cross-section information for ionizing photons (x and … more

Accelerator Facilities
Last Updated Date: 08/17/2015

The Radiation Physics Division's accelerator facilities continue to support a broad range of research efforts in the areas of industrial and … more

National and International Standards for X-ray Security Screening Applications
Last Updated Date: 08/17/2015

The primary objective of this project is to assure the technical performance and radiation safety of the nation’s x-ray and gamma-ray security … more

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