Journal ArticleDOI
Measurement and control of residual amplitude modulation in optical phase modulation.
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TLDR
Using a MgO·LiNbO(3) electro-optic crystal, a systematically measure the temperature and polarization dependence of residual amplitude modulation and the experimental results are in good agreement with a previous theoretical analysis.Abstract:
Residual amplitude modulation is one of the major sources of instability in ultra-sensitive optical detections based on frequency modulation. Using a MgO·LiNbO3 electro-optic crystal, we systematically measure the temperature and polarization dependence of residual amplitude modulation and our experimental results are in good agreement with a previous theoretical analysis. After optical phase modulation, two independent arms including optical detection and frequency demodulation are employed to closely examine the instability of the residual amplitude modulation. Residual amplitude modulation below 25 ppm is obtained with an active cancellation scheme in which the crystal temperature is varied so as to zero the baseline drifts with different origins. Possible improvements for better suppression and stability are discussed.read more
Citations
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Improved laser test of the isotropy of space
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TL;DR: In this paper, the authors used laser frequency-locking techniques to obtain an extremely sensitive readout of the length of a stable "etalon of length" of a given length.
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Reduction of residual amplitude modulation to 1 × 10^-6 for frequency modulation and laser stabilization
Wei Zhang,Michael J. Martin,Craig Benko,John L. Hall,Jun Ye,Christian Hagemann,Thomas Legero,Uwe Sterr,Fritz Riehle,Garrett D. Cole,Markus Aspelmeyer +10 more
TL;DR: A simple and robust approach to actively stabilize RAM in an optical phase modulation process using a waveguide-based electro-optic modulator to provide phase modulation and an active servo with both DC electric field and temperature feedback onto the EOM to cancel both the in-phase and quadrature components of the RAM.
Improved test of Lorentz Invariance in Electrodynamics using Rotating Cryogenic
TL;DR: In this article, the authors present new results from their test of Lorentz invariance, which compares two orthogonalcryogenic sapphire microwave oscillators rotating in the lab.
Journal ArticleDOI
Reduction of zero baseline drift of the Pound-Drever-Hall error signal with a wedged electro-optical crystal for squeezed state generation.
TL;DR: An electro-optic modulator with a wedged MgO: LiNbO3 as the modulation crystal to reduce the zero baseline drift of the Pound-Drever-Hall (PDH) error signal meets the requirements for stable squeezed light generation.
Journal ArticleDOI
Advanced technologies for satellite navigation and geodesy
Gabriele Giorgi,Tobias D. Schmidt,Christian Trainotti,R. Mata-Calvo,C. Fuchs,Mohammed Mainul Hoque,Jens Berdermann,Johann Furthner,Christoph Günther,Thilo Schuldt,Jose Sanjuan,Martin Gohlke,Markus Oswald,Markus Oswald,Claus Braxmaier,Claus Braxmaier,Kyriakos Balidakis,Galina Dick,Frank Flechtner,Maorong Ge,Susanne Glaser,Rolf König,Grzegorz Michalak,M. Murböck,Maximilian Semmling,Harald Schuh +25 more
TL;DR: An infrastructure exploiting the capabilities of both optical technologies for the realization of a modernized constellation of navigation satellites emitting highly synchronized signals is reviewed, and such infrastructure improves satellite navigation in terms intra-system synchronization, orbit determination accuracy, as well as system monitoring and integrity.
References
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Journal ArticleDOI
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TL;DR: A new type of wavelength-modulation laser spectroscopy is accomplished by utilizing an external phase modulator driven at radio frequencies large compared to the width of the spectral feature of interest.
Journal ArticleDOI
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Journal ArticleDOI
Infrared corrected Sellmeier coefficients for congruently grown lithium niobate and 5 mol. % magnesium oxide–doped lithium niobate
TL;DR: In this article, the authors report measurements of the refractive indices of congruently grown lithium niobate and lithium nibate doped with 5 mol. % magnesium oxide and use these results to predict the tuning curve of a room-temperature multigrating optical parametric oscillator.
Journal ArticleDOI
Sr lattice clock at 1 x 10(-16) fractional uncertainty by remote optical evaluation with a Ca clock.
Andrew D. Ludlow,Tanya Zelevinsky,Gretchen K. Campbell,Sebastian Blatt,Martin M. Boyd,M. H. G. de Miranda,Michael J. Martin,Jan W. Thomsen,Seth M. Foreman,Jun Ye,Tara M. Fortier,Jason Stalnaker,Scott A. Diddams,Y. Le Coq,Z. W. Barber,Nicola Poli,Nathan D. Lemke,Kristin M. Beck,Christopher W. Oates +18 more
TL;DR: A high-performance remote comparison of optical clocks over kilometer-scale urban distances is realized and the uncertainty of a strontium (Sr) optical lattice clock at the 1 × 10–16 fractional level is evaluated, surpassing the current best evaluations of cesium (Cs) primary standards.
Journal ArticleDOI
Optical heterodyne saturation spectroscopy
TL;DR: In this article, a hybrid rf/optical technique for studying sub-Doppler saturated absorption/dispersion resonances with excellent precision and symmetry is discussed, and a new level of accuracy for laser locking to an optical resonance is achieved.