Powerful Laser Diode Matrixes for Active Vision Systems
— This article is deal with the experimental investigations of the laser diode matrixes (LDM) based on the AlGaAs/GaAs heterostructures (lasing wavelength 790-880 nm) to find optimal LDM parameters for active vision systems. In particular, the dependence of LDM radiation pulse power on the pulse duration and LDA active layer heating as well as the LDM radiation divergence are discussed.
Range gated active night vision system for automobiles.
Night vision for automobiles is an emerging safety feature that is being introduced for automotive safety. We develop what we believe is an innovative new night vision system using gated imaging principles. The concept of gated imaging is described and its basic advantages, including the backscatter reduction mechanism for improved vision through fog, rain, and snow. Evaluation of performance is presented by analyzing bar pattern modulation and comparing Johnson chart predictions.
Timing jitter caused by amplified spontaneous emission in mode-locked solid state lasers
Abstract We derive a set of motion equations for the amplitude, the inverse pulse width, the chirp, the frequency, the central position of the pulse and the phase in a mode-locked solid state laser. In the hypothesis of the low and white noise, taking account of the chirp, the timing jitter induced by the amplified spontaneous emission is estimated for a Ti:sapphire laser. It results that for a certain mode-locked solid state laser with a pulse profile of sech2 (1.763t/τ), the jitter is approximately a linear function of the net group delay dispersion (GDD), and turns to be larger with the GDD increasing. However, the jitter cannot be reduced to zero even if the GDD is completely compensated.