Direct comparison of two cold-atom-based optical frequency standards by using a femtosecond-laser comb

2001 ◽  
Vol 26 (2) ◽  
pp. 102 ◽  
Author(s):  
K. R. Vogel ◽  
S. A. Diddams ◽  
C. W. Oates ◽  
E. A. Curtis ◽  
R. J. Rafac ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Cold Atom ◽  
Optical Frequency ◽  
Frequency Standards

Stable Operation of Femtosecond Laser Frequency Combs with Uncertainty at the 10-17Level toward Optical Frequency Standards

2009 ◽  
Vol 48 (4) ◽  
pp. 042301 ◽  
Author(s):  
Shigeo Nagano ◽  
Hiroyuki Ito ◽  
Ying Li ◽  
Kensuke Matsubara ◽  
Mizuhiko Hosokawa
Keyword(s):  
Femtosecond Laser ◽  
Laser Frequency ◽  
Stable Operation ◽  
Optical Frequency ◽  
Frequency Combs ◽  
Frequency Standards

scholarly journals An Optical Frequency Domain Angle Measurement Method Based on Second Harmonic Generation

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 670
Author(s):  
Wijayanti Dwi Astuti ◽  
Hiraku Matsukuma ◽  
Masaru Nakao ◽  
Kuangyi Li ◽  
Yuki Shimizu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Second Harmonic Generation ◽  
Frequency Domain ◽  
Harmonic Generation ◽  
Measurement Method ◽  
Second Harmonic ◽  
Angle Measurement ◽  
Laser Source ◽  
Optical Frequency ◽  
Measurable Range

This paper proposes a new optical angle measurement method in the optical frequency domain based on second harmonic generation with a mode-locked femtosecond laser source by making use of the unique characteristic of the high peak power and wide spectral range of the femtosecond laser pulses. To get a wide measurable range of angle measurement, a theoretical calculation for several nonlinear optical crystals is performed. As a result, LiNbO3 crystal is employed in the proposed method. In the experiment, the validity of the use of a parabolic mirror is also demonstrated, where the chromatic aberration of the focusing beam caused the localization of second harmonic generation in our previous research. Moreover, an experimental demonstration is also carried out for the proposed angle measurement method. The measurable range of 10,000 arc-seconds is achieved.

Progress towards optical frequency standards based on two-photon transitions in atomic silver

2004 ◽  
Author(s):  
Mark D. Plimmer ◽  
Thomas Badr ◽  
Stephane Guerandel ◽  
Yann Louyer ◽  
Sylvestre Challemel du Rozier ◽  
...  
Keyword(s):  
Optical Frequency ◽  
Two Photon ◽  
Frequency Standards ◽  
Atomic Silver

OPTICAL CLOCKS AND FREQUENCY METROLOGY FOR SPACE

2007 ◽  
Vol 16 (12b) ◽  
pp. 2537-2540
Author(s):  
HUGH KLEIN
Keyword(s):  
European Space Agency ◽  
Frequency Standard ◽  
Optical Frequency ◽  
Fundamental Physics ◽  
Frequency Standards ◽  
Space Agency ◽  
Primary Frequency ◽  
Measurement Capabilities ◽  
Science Activities ◽  
Frequency Metrology

Optical frequency standards and femtosecond comb measurement capabilities now rival and in some cases exceed those of microwave devices, with further improvements anticipated. Opportunities are emerging for the application of highly stable and accurate optical frequency devices to fundamental physics space science activities, and the European Space Agency (ESA) has recently commissioned studies on different aspects of optical clocks in space. This paper highlights some examples, including the difficulty of comparing very accurate terrestrial clocks at different locations due to fluctuations of the geoid; by locating a primary frequency standard in space, one could avoid geoid-related gravitational redshifts.

Optical frequency standards

1967 ◽  
Vol 3 (6) ◽  
pp. 231-231 ◽  
Author(s):  
R. Ambartzymian ◽  
N. Basov ◽  
P. Kriukov ◽  
V. Letokhov
Keyword(s):  
Optical Frequency ◽  
Frequency Standards

171Yb+ single-ion optical frequency standards

CPEM 2010 ◽  
2010 ◽  
Author(s):  
Chr. Tamm ◽  
B. Lipphardt ◽  
S. Weyers ◽  
N. Huntemann ◽  
M. Okhapkin ◽  
...  
Keyword(s):  
Optical Frequency ◽  
Frequency Standards
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