Femtosecond frequency combs: precision spectroscopy from the UV to the XUV

Speaker: 
R. Jason Jones
Event Date and Time: 
Thu, 2012-10-04 16:00 - 17:00
Location: 
Henn 318
Local Contact: 
David Jones
Intended Audience: 
Graduate

The fs frequency comb has proven to be a powerful tool in both precision spectroscopy and ultrafast science. By providing a direct phase-coherent link between optical and microwave frequencies it has dramatically simplified the precision measurement of optical transitions while simultaneously enabling access to sub-cycle control and synchronization of optical fields. It’s use has thus far been limited to wavelengths in the deep-UV or longer (>200 nm). In this talk, I will discuss experiments utilizing the fs frequency comb for precision spectroscopy at UV wavelengths and development of sources at extreme-wavelengths (XUV) below 100 nm. The first experimental effort is in the development of an optical atomic clock based on a narrow transition in neutral mercury atoms. A laser-cooled ensemble of mercury offers excellent prospects as a next generation optical frequency standard. The second effort is focused on extending precision spectroscopy into the XUV using intra-cavity high harmonic generation (HHG) with a fs frequency comb. I will discuss current results, simulations that highlight the limitations of this approach, and planned experiments utilizing this source.

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