8 August 2003 Wavelength-tunable quasi-cw laser source for high-accuracy spectrometric measurement in the 200-nm to 500-nm region
Author Affiliations +
Proceedings Volume 4826, Fourth Oxford Conference on Spectroscopy; (2003) https://doi.org/10.1117/12.514530
Event: Fourth Oxford Conference on Spectroscopy, 2002, Davidson, NC, United States
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 Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
William S. Hartree, William S. Hartree, Evangelos Theocharous, Evangelos Theocharous, Nigel P. Fox, 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, (8 August 2003); doi: 10.1117/12.514530; https://doi.org/10.1117/12.514530
PROCEEDINGS
9 PAGES


SHARE
Back to Top