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Review of Scientific Instruments / Volume 81 / Issue 6 / ARTICLES / Optics; Atoms and Molecules; Spectroscopy; Photon Detectors

Rev. Sci. Instrum. 81, 063110 (2010); http://dx.doi.org/10.1063/1.3455809 (10 pages)

Development of a multiplex fast-scan system for ultrafast time-resolved spectroscopy

Atsushi Yabushita1, Yu-Hsien Lee1, and Takayoshi Kobayashi1,2

1Department of Electrophysics, National Chiao-Tung University, Hsinchu 300, Taiwan
2Department of Applied Physics and Chemistry and Institute for Laser Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan; International Cooperative Research Project (ICORP), Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan; and Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0971, Japan

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(Received 1 February 2010; accepted 28 May 2010; published online 24 June 2010)

A fast-scan method was developed to obtain time-resolved signals with femtosecond resolution over a picosecond range on the fly and in real time. Traditional fast-scan methods collect data at each probe wavelength one by one, which is time consuming and thus not possible for the study of photofragile materials. In this work, we have developed a system that performs fast scans with multiplex detection. Ultrafast time-resolved spectroscopy was demonstrated using the newly developed system. Femtosecond laser pulses have been used for pump-probe studies of ultrafast processes in various materials, and both electronic relaxation and vibrational dynamics have been studied. However, experiments have been limited in sensitivity and reliability because they are affected by the long-term instability of the ultrashort laser pulses and by the fragility of the samples. The instability of the sources hinders precise determination of electronic decay dynamics and introduces systematic errors. The fragility of the samples reduces their amount or concentration, and can lead to contamination of the materials even if they were pure before the measurement. These effects make it difficult to obtain reproducible and reliable experimental data. In the present work, we have developed a fast-scan pump-probe spectroscopic system that can complete a set of measurements in less than 2 min. Quantitative estimates of the signal reproducibility demonstrate that these measurements provide higher reproducibility and reliability than conventional measurements.

© 2010 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENT
    1. NOPA
    2. Mechanical stage for conventional pump-probe measurements
      1. Step-scan method
    3. Mechanical stage for novel pump-probe measurements: Fast-scan method
  3. RESULTS AND DISCUSSION
    1. Calibration of the delay positions of the fast-scan stage
    2. Pump-probe measurements using the step-scan method
    3. Pump-probe measurements using the fast-scan method
  4. SUMMARY

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KEYWORDS and PACS

Keywords

high-speed optical techniques, time resolved spectroscopy

PACS

  • 42.65.Re

    Ultrafast processes; optical pulse generation and pulse compression

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3455809

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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