Abstract

We demonstrate a coherent lidar that uses a broadband femtosecond fiber laser as a source and resolves the returning heterodyne signal into N spectral channels by using an arrayed-waveguide grating. The data are processed incoherently to yield an N-times improvement in the Doppler measurement of a surface vibration. For $N=6$, we achieve a sensitivity of 153 Hz, corresponding to a $0.12\mathrm{mm}∕\mathrm{s}$ motion, in 10 ms despite a signal that is speckle broadened to 14 kHz. Alternatively, the data are processed coherently to form a range image. For a flat target, we achieve a $60\mu \mathrm{m}$ range resolution, limited mainly by the source bandwidth, despite the dispersion of 1 km of optical fiber in the signal path.

© 2006 Optical Society of America

Improved stabilization of a 1.3 µm femtosecond optical frequency comb by use of a spectrally tailored continuum from a nonlinear fiber grating

K. Kim, S. A. Diddams, P. S. Westbrook, J. W. Nicholson, and K. S. Feder
Opt. Lett. 31(2) 277-279 (2006)

Speckles in laser Doppler perfusion imaging

V. Rajan, B. Varghese, T. G. van Leeuwen, and W. Steenbergen
Opt. Lett. 31(4) 468-470 (2006)

Real-time in vivo blood-flow imaging by moving-scatterer-sensitive spectral-domain optical Doppler tomography

Hongwu Ren, Tao Sun, Daniel J. MacDonald, Michael J. Cobb, and Xingde Li
Opt. Lett. 31(7) 927-929 (2006)

Optoelectronic oscillator using a LiNbO3 phase modulator for self-oscillating frequency comb generation

Takahide Sakamoto, Tetsuya Kawanishi, and Masayuki Izutsu
Opt. Lett. 31(6) 811-813 (2006)

Ultrawideband coherent noise lidar range-Doppler imaging and signal processing by use of spatial-spectral holography in inhomogeneously broadened absorbers

Youzhi Li, Alan Hoskins, Friso Schlottau, Kelvin H. Wagner, Carl Embry, and William Randall Babbitt
Appl. Opt. 45(25) 6409-6420 (2006)