John Robinson
University of Colorado Boulder
Analytical chemistryOpticsPhysicsLattice (order)Laser linewidthAtomic physicsChemistryMaterials scienceAtomic clockThermalInstabilityCondensed matter physicsCoatingOptical frequenciesComputational physicsStability (probability)OptoelectronicsStrontiumLaserSiliconOptical lattice
57Publications
17H-index
1,502Citations
Publications 54
Newest
#1Tobias BothwellH-Index: 9
#2Colin KennedyH-Index: 10
Last. Jun YeH-Index: 126
view all 8 authors...
Einstein's theory of general relativity states that clocks at different gravitational potentials tick at different rates - an effect known as the gravitational redshift. As fundamental probes of space and time, atomic clocks have long served to test this prediction at distance scales from 30 centimeters to thousands of kilometers. Ultimately, clocks will study the union of general relativity and quantum mechanics once they become sensitive to the finite wavefunction of quantum objects oscillatin...
#1Holly LeopardiH-Index: 11
#2Kyle BeloyH-Index: 11
Last. Tara M. FortierH-Index: 38
view all 27 authors...
Source
#10Uwe Sterr (German National Metrology Institute)H-Index: 56
#10Jun YeH-Index: 126
Mechanical loss of dielectric mirror coatings sets fundamental limits for both gravitational wave detectors and cavity-stabilized optical local oscillators for atomic clocks. Two approaches are used to determine the mechanical loss: ringdown measurements of the coating quality factor and direct measurement of the coating thermal noise. Here we report a systematic study of the mirror thermal noise at 4, 16, 124, and 300 K by operating reference cavities at these temperatures. The directly measure...
Source
#1Colin KennedyH-Index: 10
#2Eric Oelker (NIST: National Institute of Standards and Technology)H-Index: 70
Last. Jun YeH-Index: 126
view all 9 authors...
We conduct frequency comparisons between a state-of-the-art strontium optical lattice clock, a cryogenic crystalline silicon cavity, and a hydrogen maser to set new bounds on the coupling of ultralight dark matter to standard model particles and fields in the mass range of 10^{-16}-10^{-21} eV. The key advantage of this two-part ratio comparison is the differential sensitivity to time variation of both the fine-structure constant and the electron mass, achieving a substantially improved limit on...
Source
#1John Robinson (CU: University of Colorado Boulder)H-Index: 17
#2Eric OelkerH-Index: 70
Last. Jun YeH-Index: 126
view all 11 authors...
Mechanical loss of dielectric mirror coatings sets fundamental limits for both gravitational wave detectors and cavity-stabilized optical local oscillators for atomic clocks. Two approaches are used to determine the mechanical loss: ringdown measurements of the coating quality factor and direct measurement of the coating thermal noise. Here we report a systematic study of the mirror thermal noise from room temperature to 4 K by operating reference cavities at these temperatures. The directly mea...
Source
#1Martha I. BodineH-Index: 3
Last. Jwo-Sy ChenH-Index: 9
view all 35 authors...
Source
#1Colin KennedyH-Index: 10
#2Eric OelkerH-Index: 70
Last. Jun YeH-Index: 5
view all 9 authors...
#3K. Beloy (NIST: National Institute of Standards and Technology)H-Index: 13
#4Martha I. Bodine (NIST: National Institute of Standards and Technology)H-Index: 3
Last. Scott A. Diddams (NIST: National Institute of Standards and Technology)H-Index: 95
view all 35 authors...
Atomic clocks occupy a unique position in measurement science, exhibiting higher accuracy than any other measurement standard and underpinning six out of seven base units in the SI system. By exploiting higher resonance frequencies, optical atomic clocks now achieve greater stability and lower frequency uncertainty than existing primary standards. Here, we report frequency ratios of the ^{27}l^+ ^{171}b and ^{87}r optical clocks in Boulder, Colorado, measured across an optical networ...
#1Nicholas Nardelli (NIST: National Institute of Standards and Technology)H-Index: 2
#2K. Beloy (NIST: National Institute of Standards and Technology)H-Index: 13
Last. Xiaogang Zhang (NIST: National Institute of Standards and Technology)H-Index: 12
view all 38 authors...
We demonstrate optical frequency comparison of the 171Yb, 27Al+ and 87Sr atomic clocks with measurement uncertainties below 1 part in 1017, and discuss how phase-coherent and synchronous clock comparisons can be used to improve measurement stability.
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