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This volume is devoted to a presentation of the development and present status of one of the most remarkable outcomes of experimental science: the techniques of frequency control and metrology. At the opening of the 20th Century, oscillators with state-of-the-art performance were based on compensated pendula with a frequency stability of the order of 1 part in 107. As the century closed, trapped-ion and laser-cooled atomic fountain clocks demonstrated a performanc that is more than eight orders of magnitude superior to that of pendulum oscillator This is an improvement rarely matched in any other area of human endeavo Recent developments have shown that frequency measurements can now be made throughout the electromagnetic spectrum with a resolution which is nearly as goo as the stability of these modern oscillators. These developments bode well for a new round of highly stringent tests of the basic tenets of modern physics.
KeywordsOptical Frequency Frequency Stability Frequency Standard Frequency Comb Optical Frequency Comb
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