Hannover 2016 – scientific programme
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A: Fachverband Atomphysik
A 30: Precision spectroscopy of atoms and ions (with Q)
A 30.18: Poster
Wednesday, March 2, 2016, 16:30–19:00, Empore Lichthof
Line shape of frequency modulation spectroscopy of molecular iodine — •Nivedya Valappol, Amita Mohanty, Elwin A. Dijck, Oliver Böll, Klaus Jungmann, and Lorenz Willmann — Van Swinderen Institute, FMNS, University of Groningen, The Netherlands
High resolution saturated absorption spectroscopy of 127I2 hyperfine transitions deliver a natural frequency grid in the 500 nm-900 nm range. An external-cavity diode laser system at 650 nm is stabilized to the frequency modulated absorption signal of the R(25)(6-5) transition in molecular I2 which is 412 MHz above the 6p2P1/2 - 5d2D3/2 transition in Ba+ ions. The diode laser can be phase locked to a frequency comb which transfers the stability of the GPS disciplined Rb clock of 10−12 optical range. We present a well-defined line shape which permits an accurate description of the observed signals. The stability of the frequency modulated saturated spectroscopy of I2 lines reaches a precision of kHz level. We find that the residual amplitude modulation, which is inherent in modulation spectroscopy, shifts the zero crossing of the line. The line shape model provides for accurate extraction of density shift, broadening and hyperfine splitting.