High Precision Measurements on Helium at 1083 nm

  • Pablo Cancio Pastor
  • Paolo De Natale
  • Giovanni Giusfredi
  • Francesco S. Pavone
  • Massimo Inguscio
Part of the Lecture Notes in Physics book series (LNP, volume 570)


We present a review of the helium spectroscopy, related to transitions between 23 S and 23 P states around 1083 nm. A detailed description of our measurements, that have produced the most accurate value of the 23 P 0–23 P 1 fine structure interval, is given. It could produce an accurate determination (34 ppb) of the fine structure constant α. Improvements in the experimental set up are presented. In particular, a new frequency reference of the laser system has been developed by frequency lock of a 1083 nm diode laser to iodine hyperfine transitions around its double of frequency. The laser frequency stability, at 1 s timescale, has been improved of, at least, two orders of magnitude, and even better for longer time scales. Simultaneous 3 He4 He spectroscopy, as well as absolute frequency measurements of 1083 nm helium transitions can be allowed by using the I2-locked laser as frequency standard. We discuss the implication of these measurements for a new determination of the isotope and 23S Lamb shifts.


Frequency Stability Optical Feedback Helium Transition Slave Laser Master Laser 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • Pablo Cancio Pastor
    • 1
    • 2
  • Paolo De Natale
    • 1
    • 2
  • Giovanni Giusfredi
    • 1
    • 2
  • Francesco S. Pavone
    • 1
    • 3
  • Massimo Inguscio
    • 1
    • 4
  1. 1.European Laboratory for Non-Linear Spectroscopy (LENS)FirenzeItaly
  2. 2.Istituto Nazionale di Ottica Applicata (INOA)FirenzeItaly
  3. 3.Dipartimento di FisicaUniversità di PerugiaVia Pascoli PerugiaItaly
  4. 4.Dipartimento di FisicaUniversità di FirenzeFirenzeItaly

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