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High Precision Measurements on Helium at 1083 nm

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

Abstract

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.

Keywords

Frequency Stability Optical Feedback Helium Transition Slave Laser Master Laser 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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