Abstract
Bulk and quantum well laser diodes with a large equivalent spot size of d a /Γ a ≈ 3 µm and stripe width/cavity length of 30 µm/3 mm were realized and tested. They achieved a pulse energy and pulse length of the order of ~1 nJ and ~100 ps, respectively, with a peak pulse current of 6–8 A and a current pulse width of 1 ns. The 2D characteristics of the optical output power versus wavelength and time were also analyzed with a monochromator/streak camera set-up. The far-field characteristics were studied with respect to the time-homogeneity and energy distribution. The feasibility of a laser diode with a large equivalent spot size in single photon detection based laser ranging was demonstrated to a non-cooperative target at a distance of a few tens of meters.
Highlights
IntroductionIt has been shown that the single photon detection (single photon avalanche detector, SPAD) mode presents a very interesting option for the receiver of a pulsed
It has been shown that the single photon detection mode presents a very interesting option for the receiver of a pulsed3 A.F
The goal of this paper is to present and compare measured results from bulk and quantum well laser diodes utilizing the ‘‘enhanced gain switching’’ principle and aiming at the above mentioned performance parameters
Summary
It has been shown that the single photon detection (single photon avalanche detector, SPAD) mode presents a very interesting option for the receiver of a pulsed. The achievable single shot precision of such a laser radar working in the single photon detection mode is set by the optical pulse width and the single photon detector response jitter. With a pulse width of 100 ps, a single shot distance measurement precision of the order of a few centimeters is available (67 ps is equivalent to 1 cm) Such a configuration brings forth a prospect of constructing a very compact, high speed and accurate TOFlaser radar and possibly solid-state 2D and 3D imagers. Rate equation based simulations showed that the use of a large equivalent spot size of[2 lm in the laser diode construction results in enhanced gain switching and single (after pulse-free) optical pulses with an energy in the range of a few nanojoules and a duration around 100 ps as is shown in details in the later sections of this paper.
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