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1. Performance of a dual Fabry-Perot cavity refractometer
Published: 8/18/2015
Authors: Patrick F Egan, Jack A Stone Jr., Jay H Hendricks, Jacob E Ricker, Gregory E Scace, Gregory F Strouse
Abstract: We have built and characterized a refractometer that utilizes two Fabry-Perot cavities formed on a dimensionally stable spacer. In the typical mode of operation, one cavity is held at vacuum and the other cavity is filled with nitrogen gas. The dif ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918403

2. Clearing the fog for best in the world air-wavelength
Published: 7/1/2015
Authors: Patrick F Egan, Jack A Stone Jr.
Abstract: Laser interferometry, the basis for modern length metrology, achieves very high accuracies as a consequence of the stable, well-known frequencies of laser sources. However, length measurements in air also require corrections based on precise knowledg ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918742

3. 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

4. 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

5. 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

6. 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

7. Performing three dimensional measurements on micro-scale features using a flexible CMM fiber probe with ellipsoidal tip
Published: 1/5/2012
Authors: Balasubramanian Muralikrishnan, Jack A Stone Jr., Craig M Shakarji, John Richard Stoup
Abstract: The tip of a traditional CMM probe used for measurements of macro-scale artifacts is generally a sphere of excellent geometry. Its known diameter (from a prior calibration) and form along with the known approach direction (which is normal to the surf ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909420

8. 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

9. Geometric effects when measuring small holes with micro contact probes.
Published: 3/1/2011
Authors: Jack A Stone Jr., Balasubramanian Muralikrishnan, Chittaranjan Sahay
Abstract: A coordinate measuring machine with a suitably small probe can be used to measure micro-features such as the diameter and form of small holes (often about 100 micrometers in diameter). When measuring small holes, the clearance between the probe tip a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903665

10. 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



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