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NIST Authors in Bold
|Author(s):||Esther Baumann; Fabrizio R. Giorgetta; Ian R. Coddington; Laura C. Sinclair; Kevin O. Knabe; William C. Swann; Nathan R. Newbury;|
|Title:||A comb-calibrated FMCW LADAR for absolute distance measurements|
|Published:||June 15, 2013|
|Abstract:||We present a comb calibrated frequency-modulated continuous wave (FMCW) LADAR system for absolute distance measurements to diffuse or specular surfaces. The FMCW LADAR uses a MEMS-based external cavity laser that is swept quasi-sinusoidally over 1 THz at a 1 kHz rate. The system simultaneously records the heterodyne FMCW LADAR signal and the instantaneous laser chirp of up to 3500 THz/sec, as measured against a free-running frequency comb (femtosecond fiber laser). Demodulation of the LADAR signal against the instantaneous laser chirp yields the range to the target with sub-millisecond update rates, bandwidth-limited 130-m resolution, precision as low as ~6 nm, and accuracy of ~ 100 ppb. The basic approach is compatible with operation at even faster update rates and with future chip-based coherent FMCW LADAR systems.|
|Pages:||pp. 2026 - 2028|
|Keywords:||ranging,frequency modulated CW ladar, comb|
|Research Areas:||Optical Physics, Spectrally Tunable Sources|