Sub-millimeter resolution laser ranging at 9.3 kilometers using temporally stretched frequency chirped pulses from a mode-locked laser

Mohammad Umar Piracha; Dat Nguyen; Dimitrios Mandridis; Tolga Yilmaz; David Gaudiosi; Peter J. Delfyett

doi:10.1117/12.820761

28 April 2009 Sub-millimeter resolution laser ranging at 9.3 kilometers using temporally stretched frequency chirped pulses from a mode-locked laser

Mohammad Umar Piracha, Dat Nguyen, Dimitrios Mandridis, Tolga Yilmaz, David Gaudiosi, Peter J. Delfyett

Author Affiliations +

Proceedings Volume 7339, Enabling Photonics Technologies for Defense, Security, and Aerospace Applications V; 73390I (2009) https://doi.org/10.1117/12.820761
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

A chirped fiber Bragg grating with a dispersion of 1651ps/nm is used to generate temporally stretched, frequency chirped pulses from a passively mode locked fiber laser that generates pulses of ~1ps (FWHM) duration at a repetition rate of 20MHz with 3.5mW average power (peak power of 175W). The use of a chirped fiber Bragg grating enables the generation of temporally stretched pulses with low peak power so that non-linear effects in the fiber can be avoided. A fiber based interferometeric arrangement is used for interfering a reference signal with the reflected signal from the target to realize a coherent heterodyne detection scheme. In the RF domain, the detected heterodyne beat frequency shifts as the target distance is changed. A round trip target distance of 14km in air is simulated using 9.3km of optical fiber and a resolution of less than a millimeter is observed.

Citation Download Citation

Mohammad Umar Piracha, Dat Nguyen, Dimitrios Mandridis, Tolga Yilmaz, David Gaudiosi, and Peter J. Delfyett "Sub-millimeter resolution laser ranging at 9.3 kilometers using temporally stretched frequency chirped pulses from a mode-locked laser", Proc. SPIE 7339, Enabling Photonics Technologies for Defense, Security, and Aerospace Applications V, 73390I (28 April 2009); https://doi.org/10.1117/12.820761

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