Femtosecond optical frequency combs |
| |
Authors: | Th?Udem R?Holzwarth Th?H?nsch |
| |
Institution: | 1.Max-Planck-Institute für Quantenoptik,Garching,Germany |
| |
Abstract: | A laser frequency comb allows the conversion of the very rapid oscillations of visible light of some 100’s of THz down to
frequencies that can be handled with conventional electronics. This capability has enabled the most precise laser spectroscopy
experiments yet that allowed to test quantum electrodynamics, to determine fundamental constants and to search for possible
slow changes of these constants. Using an optical frequency reference in combination with a laser frequency comb has made
it possible to construct all optical atomic clocks, that are now outperforming even the best cesium atomic clocks. In future
direct frequency comb spectroscopy might enable high resolution laser spectroscopy in the extreme ultraviolet for the first
time. Frequency combs are also used to calibrate astronomical spectrographs and might reach an accuracy that is sufficient
to observe the expansion of the universe in real time. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |