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Applied Optics

Applied Optics


  • Vol. 38, Iss. 36 — Dec. 20, 1999
  • pp: 7468–7474

Laser-raster spectrometer for time-resolved recording of transient absorption

Ingo Gregor and Erwin Thiel  »View Author Affiliations

Applied Optics, Vol. 38, Issue 36, pp. 7468-7474 (1999)

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For measurements of transient absorption a laser-raster technique has been found to be surprisingly sensitive. It utilizes spatial separation of excitation and probing by employing a fast-flowing jet stream. The time resolution is determined by the flow velocity and the focal diameters of the continuous excitation and probing laser beams. Changes in transmission can be detected in the spectral region from 350 to 1000 nm. A dual-frequency modulation technique is used to achieve a sensitivity of 10-4. The time resolution is 0.5 µs. The performance of this spectrometer is demonstrated by measurement of the absorption of the transient states of Rhodamine 6G dye in ethylene glycol.

© 1999 Optical Society of America

OCIS Codes
(300.6190) Spectroscopy : Spectrometers
(300.6360) Spectroscopy : Spectroscopy, laser
(300.6390) Spectroscopy : Spectroscopy, molecular
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(300.6550) Spectroscopy : Spectroscopy, visible

Original Manuscript: April 28, 1999
Revised Manuscript: September 1, 1999
Published: December 20, 1999

Ingo Gregor and Erwin Thiel, "Laser-raster spectrometer for time-resolved recording of transient absorption," Appl. Opt. 38, 7468-7474 (1999)

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