TY - GEN
T1 - Precision length measurement using an all-digital phasemeter for heterodyne laser interferometry
AU - Gray, Malcolm B.
AU - Hsu, Magnus T.L.
AU - Littler, Ian C.M.
AU - Warrington, Richard B.
AU - Herrmann, Jan
AU - Shaddock, Daniel A.
PY - 2011
Y1 - 2011
N2 - We report on an all-digital radio-frequency phasemeter for application in precision length measurements using heterodyne laser interferometry [1]. Our phasemeter has a phase sensitivity of 200 nrad/√Hz at signal frequencies of 0.2 Hz and above. We demonstrate the use of our phasemeter in an optical heterodyne interferometric configuration, using an active Sagnac interferometer test-bed. In our low-noise Sagnac test-bed, we demonstrate more than 70 dB of laser frequency noise suppression to achieve an optical phase sensitivity of 5 μrad/√Hz, and a corresponding displacement sensitivity of 0.5 pm/√Hz at signal frequencies above 10 Hz. In addition, our phasemeter has the ability to follow full fringe signals accurately at 100 Hz and to track large signal excursions in excess of 10 5 fringes without cycle slipping. Finally, we measure a cyclic error of ≤ 1 pm/√Hz.
AB - We report on an all-digital radio-frequency phasemeter for application in precision length measurements using heterodyne laser interferometry [1]. Our phasemeter has a phase sensitivity of 200 nrad/√Hz at signal frequencies of 0.2 Hz and above. We demonstrate the use of our phasemeter in an optical heterodyne interferometric configuration, using an active Sagnac interferometer test-bed. In our low-noise Sagnac test-bed, we demonstrate more than 70 dB of laser frequency noise suppression to achieve an optical phase sensitivity of 5 μrad/√Hz, and a corresponding displacement sensitivity of 0.5 pm/√Hz at signal frequencies above 10 Hz. In addition, our phasemeter has the ability to follow full fringe signals accurately at 100 Hz and to track large signal excursions in excess of 10 5 fringes without cycle slipping. Finally, we measure a cyclic error of ≤ 1 pm/√Hz.
UR - http://www.scopus.com/inward/record.url?scp=84862082604&partnerID=8YFLogxK
U2 - 10.1109/IQEC-CLEO.2011.6193936
DO - 10.1109/IQEC-CLEO.2011.6193936
M3 - Conference contribution
SN - 9780977565771
T3 - 2011 Int. Quantum Electron. Conf., IQEC 2011 and Conf. Lasers and Electro-Optics, CLEO Pacific Rim 2011 Incorporating the Australasian Conf. Optics, Lasers and Spectroscopy and the Australian Conf.
SP - 316
EP - 318
BT - 2011 Int. Quantum Electr. Conf., IQEC 2011 Conf Lasers Electro-Optics, CLEO Pacific Rim 2011 Incorporating Australasian Conf. on Optics, Lasers Spectrosc. Australian Conf. Optical Fibre Technol.- Conf
T2 - 2011 International Quantum Electronics Conference, IQEC 2011 and Conference on Lasers and Electro-Optics, CLEO Pacific Rim 2011
Y2 - 28 August 2011 through 1 September 2011
ER -