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A sequence of optical holeburning pulses is used to isolate transitionsbetween hyperfine levels, which are initially buried within an inhomogeneouslybroadened absorption line. Using this technique selected transitions can bestudied with no background absorption on other transitions. This makes itpossible to directly study properties of the hyperfine transitions, e.g.transition strengths, and gives access to information that is difficult toobtain in standard holeburning spectroscopy, such as the ordering of hyperfinelevels. The techniques introduced are applicable to absorbers in a solid withlong-lived sublevels in the ground state and where the homogeneous linewidthand sublevel separations are smaller than the inhomogeneous broadening of theoptical transition. In particular, this includes rare-earth ions doped intoinorganic crystals and in the present work the techniques are used forspectroscopy of Pr3+ in Y2SiO5. New information on the hyperfine structure andrelative transition strengths of the 3H4 - 1D2 hyperfine transitions inPr3+:Y2SiO5 has been obtained from frequency resolved absorption measurements,in combination with coherent and incoherent driving of the transitions.Comment: 30 pages, including figures, tables and references (12 pages text, 9  figures, 2 tables

physical review. b, condensed matter and materials physics

Hole-burning techniques for isolation and study of individual hyperfine transitions in inhomogeneously broadened solids demonstrated in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msub><mml:mrow><mml:mo>:</mml:mo><mml:mi mathvariant="normal">Y</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml…

Hole-burning techniques for isolation and study of individual hyperfine transitions in inhomogeneously broadened solids demonstrated inPr3+:Y2