Abstract
Vibrational motion of a harmonic oscillator was investigated with a focused continuous-wave (cw) Doppler lidar at 9.1-μm wavelength. A continuum of frequencies along with many discrete, equally spaced, resonant frequency modes was observed. The frequency modes are similar in structure to the oscillatory longitudinal modes of a laser cavity and arise because of interference of the natural resonant frequency of the oscillator with specific frequencies within the continuum. Each consecutive resonant frequency mode occurred for a movement of the oscillator much less than the wavelength of incident lidar radiation. For vigorous vibration of the oscillator, the observed spectra may be indicating nonlinear motion.
© 2000 Optical Society of America
Full Article | PDF ArticleMore Like This
Maurice A. Jarzembski and Vandana Srivastava
Appl. Opt. 38(15) 3387-3393 (1999)
Jeffry Rothermel, Diana M. Chambers, Maurice A. Jarzembski, Vandana Srivastava, David A. Bowdle, and William D. Jones
Appl. Opt. 35(12) 2083-2095 (1996)
Vladimir Stoykov Marinov and Dimitar Vassilev Stoyanov
Appl. Opt. 38(12) 2579-2585 (1999)