Chakraborty, Arup Lal and Ruxton, Keith C. and Johnstone, W. (2010) Suppression of intensity modulation contributions to signals in second harmonic wavelength modulation spectroscopy. Optics Letters, 35 (14). pp. 2400-2402. ISSN 0146-9592Full text not available in this repository. (Request a copy from the Strathclyde author)
Recovery of the full 2f wavelength modulation spectroscopy (WMS) signal in isolation from the 2f residual amplitude modulation (RAM) due to nonlinear intensity modulation (IM) and distortion due to linear IM is demonstrated. The 2f RAM is eliminated using a fiber delay line, while the linear IM-induced distortion is eliminated by a phasor decomposition approach. This generic and robust two-pronged strategy removes the need to separately measure the 2f RAM in high-modulation-index calibration-free 2f WMS. It is also important for widely tunable 2f WMS using nontelecom diode lasers with highly nonlinear characteristics leading to high-2f RAM levels.
|Keywords:||spectroscopy, diode lasers, optical sensing, sensors, optics, Electrical engineering. Electronics Nuclear engineering, Atomic and Molecular Physics, and Optics|
|Subjects:||Technology > Electrical engineering. Electronics Nuclear engineering|
|Department:||Faculty of Engineering > Electronic and Electrical Engineering|
|Depositing user:||Miss Rachel Foster|
|Date Deposited:||13 Jul 2010 10:45|
|Last modified:||24 Mar 2017 06:04|