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Sample exchange by beam scanning with applications to noncollinear pump-probe spectroscopy at kilohertz repetition rates

Spencer, Austin P. ; Hill, Robert J. ; Peters, William K. ; Baranov, Dmitry LU orcid ; Cho, Byungmoon ; Huerta-Viga, Adriana ; Carollo, Alexa R. LU ; Curtis, Anna C. and Jonas, David M. (2017) In Review of Scientific Instruments 88(6).
Abstract

In laser spectroscopy, high photon flux can perturb the sample away from thermal equilibrium, altering its spectroscopic properties. Here, we describe an optical beam scanning apparatus that minimizes repetitive sample excitation while providing shot-to-shot sample exchange for samples such as cryostats, films, and air-tight cuvettes. In this apparatus, the beam crossing point is moved within the focal plane inside the sample by scanning both tilt angles of a flat mirror. A space-filling spiral scan pattern was designed that efficiently utilizes the sample area and mirror scanning bandwidth. Scanning beams along a spiral path is shown to increase the average number of laser shots that can be sampled before a spot on the sample cell is... (More)

In laser spectroscopy, high photon flux can perturb the sample away from thermal equilibrium, altering its spectroscopic properties. Here, we describe an optical beam scanning apparatus that minimizes repetitive sample excitation while providing shot-to-shot sample exchange for samples such as cryostats, films, and air-tight cuvettes. In this apparatus, the beam crossing point is moved within the focal plane inside the sample by scanning both tilt angles of a flat mirror. A space-filling spiral scan pattern was designed that efficiently utilizes the sample area and mirror scanning bandwidth. Scanning beams along a spiral path is shown to increase the average number of laser shots that can be sampled before a spot on the sample cell is resampled by the laser to ∼1700 (out of the maximum possible 2500 for the sample area and laser spot size) while ensuring minimal shot-to-shot spatial overlap. Both an all-refractive version and an all-reflective version of the apparatus are demonstrated. The beam scanning apparatus does not measurably alter the time delay (less than the 0.4 fs measurement uncertainty), the laser focal spot size (less than the 2 μm measurement uncertainty), or the beam overlap (less than the 3.3% measurement uncertainty), leading to pump-probe and autocorrelation signal transients that accurately characterize the equilibrium sample.

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Please use this url to cite or link to this publication:
author
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publishing date
type
Contribution to journal
publication status
published
in
Review of Scientific Instruments
volume
88
issue
6
article number
064101
pages
7 pages
publisher
American Institute of Physics (AIP)
external identifiers
  • pmid:28667957
  • scopus:85021438456
ISSN
0034-6748
DOI
10.1063/1.4986628
language
English
LU publication?
no
additional info
Publisher Copyright: © 2017 Author(s).
id
5c8ddd1e-1cf6-4e9a-a210-03fd19d6d4ab
date added to LUP
2023-01-17 13:54:00
date last changed
2024-03-06 07:10:52
@article{5c8ddd1e-1cf6-4e9a-a210-03fd19d6d4ab,
  abstract     = {{<p>In laser spectroscopy, high photon flux can perturb the sample away from thermal equilibrium, altering its spectroscopic properties. Here, we describe an optical beam scanning apparatus that minimizes repetitive sample excitation while providing shot-to-shot sample exchange for samples such as cryostats, films, and air-tight cuvettes. In this apparatus, the beam crossing point is moved within the focal plane inside the sample by scanning both tilt angles of a flat mirror. A space-filling spiral scan pattern was designed that efficiently utilizes the sample area and mirror scanning bandwidth. Scanning beams along a spiral path is shown to increase the average number of laser shots that can be sampled before a spot on the sample cell is resampled by the laser to ∼1700 (out of the maximum possible 2500 for the sample area and laser spot size) while ensuring minimal shot-to-shot spatial overlap. Both an all-refractive version and an all-reflective version of the apparatus are demonstrated. The beam scanning apparatus does not measurably alter the time delay (less than the 0.4 fs measurement uncertainty), the laser focal spot size (less than the 2 μm measurement uncertainty), or the beam overlap (less than the 3.3% measurement uncertainty), leading to pump-probe and autocorrelation signal transients that accurately characterize the equilibrium sample.</p>}},
  author       = {{Spencer, Austin P. and Hill, Robert J. and Peters, William K. and Baranov, Dmitry and Cho, Byungmoon and Huerta-Viga, Adriana and Carollo, Alexa R. and Curtis, Anna C. and Jonas, David M.}},
  issn         = {{0034-6748}},
  language     = {{eng}},
  month        = {{06}},
  number       = {{6}},
  publisher    = {{American Institute of Physics (AIP)}},
  series       = {{Review of Scientific Instruments}},
  title        = {{Sample exchange by beam scanning with applications to noncollinear pump-probe spectroscopy at kilohertz repetition rates}},
  url          = {{http://dx.doi.org/10.1063/1.4986628}},
  doi          = {{10.1063/1.4986628}},
  volume       = {{88}},
  year         = {{2017}},
}