Theoretical analysis of the impact of local oscillator frequency noise on a laser vibration sensor

Philip Gatt; Steven E. Johnson; Sammy W. Henderson; Charley P. Hale

doi:10.1117/12.476406

29 July 2002 Theoretical analysis of the impact of local oscillator frequency noise on a laser vibration sensor

Philip Gatt, Steven E. Johnson, Sammy W. Henderson, Charley P. Hale

Proceedings Volume 4723, Laser Radar Technology and Applications VII; (2002) https://doi.org/10.1117/12.476406
Event: AeroSense 2002, 2002, Orlando, FL, United States

Abstract

The sensitivity of a mDoppler sensor is proportional to the velocity noise PSD (Power Spectral Density (m/s)2/Hz). In long-range applications, LO (Local Oscillator) laser frequency noise can be the dominant velocity noise source. In this paper we develop the relationship between the LO laser frequency PSD (Hz2/Hz) and the measured velocity noise PSD. The integrated velocity PSD or velocity variance is shown to depend upon the LO noise PSD shape and amplitude, the target round-trip time, and the measurement. The performance of a frequency stabilized and unstabilized LO laser, which exhibit a white and 1/f2 frequency noise spectrum respectively, is then predicted from this transfer function theory.

Citation Download Citation

Philip Gatt, Steven E. Johnson, Sammy W. Henderson, and Charley P. Hale "Theoretical analysis of the impact of local oscillator frequency noise on a laser vibration sensor", Proc. SPIE 4723, Laser Radar Technology and Applications VII, (29 July 2002); https://doi.org/10.1117/12.476406

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