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Author: Patrick Egan

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1. In Search of Better Pressure Standards
Published: 8/1/2014
Authors: Jay H Hendricks, Jacob E Ricker, Patrick F Egan, Gregory F Strouse
Abstract: Based on highly accurate optical interferometry and fundamental quantum calculations, researchers at the National Institute of Standards and Technology (NIST) in the US are developing an improved definition of the SI unit for pressure that will consi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916352

2. Metrology for comparison of displacements at the picometer level
Published: 7/31/2014
Authors: Jack A Stone Jr, Patrick F Egan, Jay H Hendricks, Gregory F Strouse, Douglas A Olson, Jacob E Ricker, Gregory E Scace, Donavon Gerty
Abstract: An apparatus capable of comparing displacements with picometer accuracy is currently being designed at NIST. In principle, we wish to compare one displacement in vacuum to a second, equal displacement in gas, in order to determine gas refractive inde ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914470

3. Picometer Metrology for Precise Measurement of Refractive Index, Pressure, and Temperature
Published: 12/18/2013
Authors: Jack A Stone Jr, Patrick F Egan, Donavon Gerty, Jay H Hendricks, Douglas A Olson, Jacob E Ricker, Gregory E Scace, Gregory F Strouse
Abstract: Fabry-Perot interferometers can be used for very precise measurement of the refractive index of gasses. This can enable increased accuracy of interferometer-based length measurement. In addition, because the refractive index of a gas depends on its ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914549

4. Picometer metrology for precise measurement of refractive index, pressure, and temperature
Published: 7/14/2013
Authors: Jack A Stone Jr, Patrick F Egan, Jay H Hendricks, Gregory F Strouse, Douglas A Olson, Jacob E Ricker, Gregory E Scace
Abstract: For several years we have been studying the use of Fabry-Perot interferometers for precise measurement of the refractive index of gasses, where the primary motivation has been to improve interferometer-based length measurement. Because the refractiv ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913914

5. Weak value thermostat with 0.2 mK precision
Published: 12/1/2012
Authors: Patrick F Egan, Jack A Stone Jr
Abstract: A new laser-based thermostat sensitive to 0.2 mK at room temperature is reported. The method utilizes a fluid-filled prism and interferometric weak value amplification to sense nanoradian deviations of a laser beam: due to the high thermooptic coef ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912232

6. Absolute refractometry of dry gas to {+ or -}3 parts in 10^u9^
Published: 6/20/2011
Authors: Patrick F Egan, Jack A Stone Jr
Abstract: We present a method of measuring the refractive index of dry gases absolutely at 632.8 nm wavelength using a Fabry-Perot cavity with an expanded uncertainty of < 3 {multiply} 10^u-9^ (coverage factor {I}k{/I} = 2. The main contribution to this uncer ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907731

7. Temperature Stabilization System with Millikelvin Gradients for Air Refractometry Measurements Below the 10^-8 Level
Published: 3/1/2011
Authors: Patrick F Egan, Jack A Stone Jr
Abstract: Refractometry of air is a central problem for interferometer-based dimensional measurements. Refractometry at the 10−9 level is only valid if air temperature gradients are controlled at the millikelvin (mK) level. Very precise tests of secondge ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907214

8. An Optical Frequency Comb Tied to GPS for Laser Frequency/Wavelength Calibration
Published: 11/1/2010
Authors: Jack A Stone Jr, Patrick F Egan
Abstract: Optical frequency combs can be employed over a broad spectral range to calibrate laser frequency or vacuum wavelength. This article describes procedures and techniques utilized in the Precision Engineering Division of NIST (National Institute of Sta ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904835

9. Temperature stabilization system with millikelvin gradients for refractometry
Published: 7/25/2010
Authors: Patrick F Egan, Jack A Stone Jr
Abstract: Refractometry of air is a central problem for interferometer-based dimensional measurements. Refractometry at the 10^{-9} level is only valid if air temperature gradients are controlled at the millikelvin level. Very precise tests of second-generati ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906095

10. Calibrating Laser Vacuum Wavelength With a GPS-Based Optical Frequency Comb
Published: 5/15/2007
Authors: Jack A Stone Jr, Liang Lu, Patrick F Egan
Abstract: The Global Positioning System (GPS) can deliver an exceptionally accurate frequency standard to any point in the world. When we use the GPS signal to control an optical frequency comb, the comb+GPS system provides laser light with well-known frequenc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=823235



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