Mid-infrared photon counting LIDAR using intra-cavity up-conversion

Max Widarsson; Markus Henriksson; Valdas Pasiskevicius; Fredrik Laurell

doi:10.1117/12.2601750

12 September 2021 Mid-infrared photon counting LIDAR using intra-cavity up-conversion

Max Widarsson, Markus Henriksson, Valdas Pasiskevicius, Fredrik Laurell

Proceedings Volume 11868, Emerging Imaging and Sensing Technologies for Security and Defence VI; 1186804 (2021) https://doi.org/10.1117/12.2601750
Event: SPIE Security + Defence, 2021, Online Only

Abstract

The principles behind up-conversion time correlated single photon counting (TCSPC) lidar are presented. This technique can easily extend the detection range of conventional SPADs to reach into the MIR by utilising nonlinear processes to up-convert the wavelength of the MIR to the visible or NIR. The up-converted light can then be detected by a standard Si-SPAD. This allows for high resolution and sensitivity to be achieved while operating the system at room temperature. The technique is demonstrated through a short-range lidar system measuring off diffusely reflecting targets. The system was operating at 3 μm with pulse energies around 3 nJ and a pulse width of 300 fs. The up-conversion was performed inside a PPRKTP crystal placed within a Nd:YVO₄ laser cavity operating at 1064 nm, which generated pulses at 790 nm. The temporal FWHM of the lidar response was 76 ps, and the system showed sub-mm range accuracy, demonstrated by scanning 3D targets.

Conference Presentation

Citation Download Citation

Max Widarsson, Markus Henriksson, Valdas Pasiskevicius, and Fredrik Laurell "Mid-infrared photon counting LIDAR using intra-cavity up-conversion", Proc. SPIE 11868, Emerging Imaging and Sensing Technologies for Security and Defence VI, 1186804 (12 September 2021); https://doi.org/10.1117/12.2601750

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