Development of an Extreme Ultraviolet Frequency Comb for Precision Spectroscopy

Author
Abstract
We describe an extreme-ultraviolet frequency comb produced via high repetition rate, intracavity high harmonic generation. The experimental apparatus consists of a high power frequency comb of 80 W average power, which excites a robust femtosecond enhancement cavity. On resonance, the enhancement cavity contains >8 kW of average power and is capable of driving the high harmonic process at a repetition rate of 154 MHz producing a frequency comb. More than 200 microwatts of XUV power is generated in each harmonic. While it is difficult to build a continuous wave laser below 100 nm, this source functions as millions of intrinsically calibrated narrow-linewidth sources in the XUV. With this unique radiation source, we were able to conduct high resolution, direct frequency comb spectroscopy on neutral argon atoms at a wavelength of 82 nm. This measurement demonstrates the efficacy of this technique for precision measurement.
Year of Publication
2011
Academic Department
Department of Physics
Degree
Ph.D.
Number of Pages
186
Date Published
2011-12
University
University of Colorado Boulder
City
Boulder
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