Coherent two-photon absorption spectroscopy of the Raman-active KGd(WO4)2 crystal

Arkady Major, J.S. Aitchison, Peter W.E. Smith, Nigel Langford, Allister I. Ferguson

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We report on the systematic open-aperture Z-scan characterization of the two-photon absorption properties in one of the most efficient solid-state Raman frequency shifters, the crystal potassium gadolinium tungstate [KGd(WO4)2]. The two-photon absorption coefficient was determined in the 370-600-nm wavelength range, with the highest value found to be ~1.9 cm/GW at 370 nm. Nonlinear losses are crucial in determining the conversion efficiency of the stimulated Raman scattering process when it is excited with ultrashort laser pulses with photon energy exceeding half of the bandgap. In addition, the results were analyzed within the context of a simple two-parabolic-band theoretical model to yield an effective bandgap energy value for the crystal.
LanguageEnglish
Pages2896-2898
Number of pages2
JournalOptics Letters
Volume29
Issue number24
DOIs
Publication statusPublished - Dec 2004

Fingerprint

absorption spectroscopy
photons
crystals
tungstates
gadolinium
potassium
absorptivity
apertures
Raman spectra
solid state
energy
pulses
wavelengths
lasers

Keywords

  • multiphoton processes
  • optical nonlinearities of condensed matter
  • Raman effect
  • optics
  • photonics

Cite this

Major, Arkady ; Aitchison, J.S. ; Smith, Peter W.E. ; Langford, Nigel ; Ferguson, Allister I. / Coherent two-photon absorption spectroscopy of the Raman-active KGd(WO4)2 crystal. In: Optics Letters. 2004 ; Vol. 29, No. 24. pp. 2896-2898.
@article{963c0ed94e054154b5b1dcc2d3f92e4a,
title = "Coherent two-photon absorption spectroscopy of the Raman-active KGd(WO4)2 crystal",
abstract = "We report on the systematic open-aperture Z-scan characterization of the two-photon absorption properties in one of the most efficient solid-state Raman frequency shifters, the crystal potassium gadolinium tungstate [KGd(WO4)2]. The two-photon absorption coefficient was determined in the 370-600-nm wavelength range, with the highest value found to be ~1.9 cm/GW at 370 nm. Nonlinear losses are crucial in determining the conversion efficiency of the stimulated Raman scattering process when it is excited with ultrashort laser pulses with photon energy exceeding half of the bandgap. In addition, the results were analyzed within the context of a simple two-parabolic-band theoretical model to yield an effective bandgap energy value for the crystal.",
keywords = "multiphoton processes, optical nonlinearities of condensed matter, Raman effect, optics, photonics",
author = "Arkady Major and J.S. Aitchison and Smith, {Peter W.E.} and Nigel Langford and Ferguson, {Allister I.}",
year = "2004",
month = "12",
doi = "10.1364/OL.29.002896",
language = "English",
volume = "29",
pages = "2896--2898",
journal = "Optics Letters",
issn = "0146-9592",
publisher = "Optical Society of America",
number = "24",

}

Coherent two-photon absorption spectroscopy of the Raman-active KGd(WO4)2 crystal. / Major, Arkady; Aitchison, J.S.; Smith, Peter W.E.; Langford, Nigel; Ferguson, Allister I.

In: Optics Letters, Vol. 29, No. 24, 12.2004, p. 2896-2898.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Coherent two-photon absorption spectroscopy of the Raman-active KGd(WO4)2 crystal

AU - Major, Arkady

AU - Aitchison, J.S.

AU - Smith, Peter W.E.

AU - Langford, Nigel

AU - Ferguson, Allister I.

PY - 2004/12

Y1 - 2004/12

N2 - We report on the systematic open-aperture Z-scan characterization of the two-photon absorption properties in one of the most efficient solid-state Raman frequency shifters, the crystal potassium gadolinium tungstate [KGd(WO4)2]. The two-photon absorption coefficient was determined in the 370-600-nm wavelength range, with the highest value found to be ~1.9 cm/GW at 370 nm. Nonlinear losses are crucial in determining the conversion efficiency of the stimulated Raman scattering process when it is excited with ultrashort laser pulses with photon energy exceeding half of the bandgap. In addition, the results were analyzed within the context of a simple two-parabolic-band theoretical model to yield an effective bandgap energy value for the crystal.

AB - We report on the systematic open-aperture Z-scan characterization of the two-photon absorption properties in one of the most efficient solid-state Raman frequency shifters, the crystal potassium gadolinium tungstate [KGd(WO4)2]. The two-photon absorption coefficient was determined in the 370-600-nm wavelength range, with the highest value found to be ~1.9 cm/GW at 370 nm. Nonlinear losses are crucial in determining the conversion efficiency of the stimulated Raman scattering process when it is excited with ultrashort laser pulses with photon energy exceeding half of the bandgap. In addition, the results were analyzed within the context of a simple two-parabolic-band theoretical model to yield an effective bandgap energy value for the crystal.

KW - multiphoton processes

KW - optical nonlinearities of condensed matter

KW - Raman effect

KW - optics

KW - photonics

UR - http://dx.doi.org/10.1364/OL.29.002896

U2 - 10.1364/OL.29.002896

DO - 10.1364/OL.29.002896

M3 - Article

VL - 29

SP - 2896

EP - 2898

JO - Optics Letters

T2 - Optics Letters

JF - Optics Letters

SN - 0146-9592

IS - 24

ER -