scholarly journals Optical frequency measurement across a 104-THz gap with a femtosecond laser frequency comb

2000 ◽  
Vol 25 (3) ◽  
pp. 186 ◽  
Author(s):  
Scott A. Diddams ◽  
David J. Jones ◽  
Long-Sheng Ma ◽  
Steven T. Cundiff ◽  
John L. Hall
Keyword(s):  
Femtosecond Laser ◽  
Frequency Comb ◽  
Frequency Measurement ◽  
Laser Frequency ◽  
Optical Frequency

Precision spectroscopy of hydrogen and femtosecond laser frequency combs

2005 ◽  
Vol 363 (1834) ◽  
pp. 2155-2163 ◽  
Author(s):  
T.W Hänsch ◽  
J Alnis ◽  
P Fendel ◽  
M Fischer ◽  
C Gohle ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Frequency Comb ◽  
Structure Constant ◽  
Laser Frequency ◽  
Fine Structure Constant ◽  
Optical Frequency ◽  
Precision Spectroscopy ◽  
Frequency Combs ◽  
Two Photon ◽  
Optical Frequency Metrology

Precision spectroscopy of the simple hydrogen atom has inspired dramatic advances in optical frequency metrology: femtosecond laser optical frequency comb synthesizers have revolutionized the precise measurement of optical frequencies, and they provide a reliable clock mechanism for optical atomic clocks. Precision spectroscopy of the hydrogen 1S–2S two-photon resonance has reached an accuracy of 1.4 parts in 10 14 , and considerable future improvements are envisioned. Such laboratory experiments are setting new limits for possible slow variations of the fine structure constant α and the magnetic moment of the caesium nucleus μ Cs in units of the Bohr magneton μ B .

scholarly journals Controlling and Phase‐Locking a THz Quantum Cascade Laser Frequency Comb by Small Optical Frequency Tuning

2021 ◽  
pp. 2000417
Author(s):  
Luigi Consolino ◽  
Annamaria Campa ◽  
Michele De Regis ◽  
Francesco Cappelli ◽  
Giacomo Scalari ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Frequency Tuning ◽  
Frequency Comb ◽  
Phase Locking ◽  
Laser Frequency ◽  
Optical Frequency ◽  
Quantum Cascade
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