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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-1382
DTSTART:20090423T210000Z
DURATION:PT1H0M0S
DTSTAMP:20260420T095533Z
LAST-MODIFIED:20090420T163424Z
LOCATION:4274 Chamberlin
SUMMARY:Searching for exoearths and measuring the acceleration of the 
 universe with femtosecond laser frequency combs\, NPAC (Nuclear/Partic
 le/Astro/Cosmo) Forum\, Andrew Szentgyorgyi\, Harvard CFA
DESCRIPTION:Octave-spanning\, mode locked femtosecond laser frequency 
 combs convert<br>
\nthe most precise instrument available today - the 
 atomic clock - to the frequency domain\, providing an equally precise 
 yardstick for wavelength calibration\, potentially 1:10^15. Precision 
 at this level enables astronomical radial velocity measurements to 1 c
 m/sec over decadal time scales. This capability will make it possible 
 to search for earth-like planets orbiting solar type-stars in the habi
 table zone and to measure the expansion of the universe directly\, as 
 well as to explore the local distribution of dark matter and to search
  for variations of fundamental constants over cosmological time scales
 . I discuss the techniques\, status and potential of this instrumentat
 ion as well as ongoing and future observational programs in pursuit of
  these scientific objectives.
URL:https://www.physics.wisc.edu/events/?id=1382
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