Advanced holeburning techniques for determination of hyperfine transition properties in inhomogeneously broadened solids applied to Pr3+:Y2SiO5

TL;DR

This paper introduces advanced holeburning techniques to isolate and study hyperfine transitions in inhomogeneously broadened solids, enabling detailed analysis of hyperfine structures and transition strengths, demonstrated on Pr3+:Y2SiO5.

Contribution

The paper presents novel holeburning methods that allow direct investigation of hyperfine transition properties in solids with long-lived sublevels, overcoming limitations of standard spectroscopy.

Findings

New hyperfine structure data for Pr3+:Y2SiO5

Determination of relative transition strengths

Access to hyperfine level ordering

Abstract

A sequence of optical holeburning pulses is used to isolate transitions between hyperfine levels, which are initially buried within an inhomogeneously broadened absorption line. Using this technique selected transitions can be studied with no background absorption on other transitions. This makes it possible to directly study properties of the hyperfine transitions, e.g. transition strengths, and gives access to information that is difficult to obtain in standard holeburning spectroscopy, such as the ordering of hyperfine levels. The techniques introduced are applicable to absorbers in a solid with long-lived sublevels in the ground state and where the homogeneous linewidth and sublevel separations are smaller than the inhomogeneous broadening of the optical transition. In particular, this includes rare-earth ions doped into inorganic crystals and in the present work the techniques are used for spectroscopy of Pr3+ in Y2SiO5. New information on the hyperfine structure and relative transition strengths of the 3H4 - 1D2 hyperfine transitions in Pr3+:Y2SiO5 has been obtained from frequency resolved absorption measurements, in combination with coherent and incoherent driving of the transitions.