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Proceedings Article

Wavelength-tunable quasi-cw laser source for high-accuracy spectrometric measurement in the 200-nm to 500-nm region

[+] Author Affiliations
William S. Hartree, Evangelos Theocharous, Nigel P. Fox

National Physical Lab. (United Kingdom)

Proc. SPIE 4826, Fourth Oxford Conference on Spectroscopy, 104 (July 28, 2003); doi:10.1117/12.514530
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From Conference Volume 4826

  • Fourth Oxford Conference on Spectroscopy
  • Art Springsteen; Michael Pointer
  • Davidson, United States | June 10, 2002

abstract

Harmonic generation of the output of a mode-locked titanium sapphire laser is a highly effective means for producing high power, quasi-cw, wavelength tunable radiation in the 200-500 nm spectral range. The laser is not truly cw, consisting of pulses at approximately 100 MHz. This paper investigates the possibility of stretching these pulses in time using a multimode optical fiber to achieve a truly cw signal: stretching of a 1.5 ps pulse to around 1 ns has been demonstrated. Non-linearity effects in the responsivity of different optical radiation detectors due to the pulsed nature of the radiation have been investigated, and no evidence for non-linearity has been seen for either silicon or GaAsP detectors at wavelengths of 300 or 360 nm within the measurement uncertainties (< 0.15%). Finally, data are presented indicating that the use of mode-locked radiation in transmittance spectrophotometry avoids the problem of interference between front and back surface reflections which has previously hindered high accuracy transmittance measurement using lasers.

© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

William S. Hartree ; Evangelos Theocharous and Nigel P. Fox
"Wavelength-tunable quasi-cw laser source for high-accuracy spectrometric measurement in the 200-nm to 500-nm region", Proc. SPIE 4826, Fourth Oxford Conference on Spectroscopy, 104 (July 28, 2003); doi:10.1117/12.514530; http://dx.doi.org/10.1117/12.514530


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