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High speed lidar via GHz gated photon detector and locked but unequal optical pulse rates

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Abstract

High speed and high sensitivity time-of-flight lidar is demonstrated by judiciously choosing the repetition rates of a pulsed optical source and the gate rate of a GHz gated single photon detector. Sub-mm ranging can be performed in sub-ms time scales at low received powers. We also demonstrate a method to extend the unambiguous measurement range by simultaneously transmitting multiple optical pulse rates and measuring the return signal with a single detector.

© 2014 Optical Society of America

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Figures (3)

Fig. 1
Fig. 1 (a) Block diagram of GET lidar system configured for measuring ranging resolution vs. optical power. (b) Re-ordered histograms of 80 bins (black open squares) and 85 bins (blue filled diamonds). Dotted lines connect the points to guide the eye.
Fig. 2
Fig. 2 (a) Resolution as a function of received power for 109 MHz (open squares) and 88 MHz (filled diamonds) pulses. The dotted line shows the expected trend for count-statistics limited performance (see text). (b) Corresponding failure probability for the extended range calculation.
Fig. 3
Fig. 3 Range measurements to a moving curved fan blade as a function of time. (a) 500 μs per point, about −75 dBm power. The curve is a best 2nd order polynomial line. (b) 100 μs per point, −80 dBm power with the same fitting curve.

Equations (2)

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R 1,2 = D 1 D 2 c 2G f gate ,
| e 1 e 2 |< Gc 4 N 1 N 2 f gate
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