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Daniel Barker (Fed)

Daniel Barker is a physicist in the Fundamental Thermodynamics Group in the Sensor Science Division. He received a B.A. in Physics from Goucher College and a Ph.D. in atomic, molecular, and optical physics from the University of Maryland, where he studied quantum degenerate gases of alkaline-earth elements. Daniel came to NIST as a National Research Council Postdoctoral Research Associate to develop primary vacuum sensors under the Cold Core Technology program. Since joining the NIST staff, his research has focused on developing chip-scale sensors based on laser-cooled atoms or optomechanical systems, particularly for temperature and pressure metrology.

Research Projects



Grating magneto-optical traps with complicated level structures

Daniel Barker, Peter Elgee, Ananya Sitaram, Eric Norrgard, Nikolai Klimov, Gretchen K. Campbell, Stephen Eckel
We study the forces and optical pumping within grating magneto-optical traps (MOTs) operating on transitions with non-trivial level structure. In contrast to

Simulations of a frequency-chirped magneto-optical trap of MgF

Kayla Rodriguez, Nickolas Pilgram, Daniel Barker, Stephen Eckel, Eric Norrgard
We simulate the capture process of MgF molecules into a frequency-chirped molecular MOT. Our calculations show that by chirping the frequency, the MOT capture

Precise Quantum Measurement of Vacuum with Cold Atoms

Daniel Barker, Bishnu Acharya, James A. Fedchak, Nikolai Klimov, Eric Norrgard, Julia Scherschligt, Eite Tiesinga, Stephen Eckel
We describe the cold-atom vacuum standards (CAVS) under development at the National Institute of Standards and Technology. The CAVS measures pressure in the

A constant pressure flowmeter for the extremely high vacuum

Stephen Eckel, Daniel Barker, James A. Fedchak, Emmanuel Newsome, Julia Scherschligt, Robert E. Vest
We demonstrate operation of a constant-pressure flowmeter capable of generating and accurately measuring flows as low as $1\times10^-13}$mol/s. Generation of

Patents (2018-Present)

Uniaxial Counter-Propagating Monolaser Atom Trap

NIST Inventors
Stephen Eckel , James A. Fedchak , Julia Scherschligt , Daniel Barker , Eric Norrgard and Nikolai Klimov
A uniaxial counter-propagating monolaser atom trap cools and traps atoms with a single a laser beam and includes: an atom slower that slows atoms to form slowed atoms; an optical diffractor including: a first diffraction grating that receives primary light and produces first reflected light; a
Created July 30, 2019, Updated June 3, 2024