Single Headlamp with Low- and High-Beam Light

A single gradientless light beam drags particles as “tractor beam”

Usually a light beam pushes a particle when the photons act upon it. We investigate the optical forces by non-paraxial gradientless beams and find that the forces can drag suitable particles all the way towards the light source. The major criterion of realizing the backward dragging force is the strong non-paraxiality of the light beam, which contributes to the pulling force owing to the moment...

Reflective Optics Design for an LED High Beam Headlamp of Motorbikes

We propose a reflective optics design for an LED motorbike high beam lamp. We set the measuring screen as an elliptical zone and divide it into many small lattices and divide the spatial angle of the LED source into many parts and make relationships between them. According to the conservation law of energy and the Snell's law, the reflector is generated by freeform optics design method. Then th...

Relative Merits of the U.s. and Ece High-beam Maximum Intensities and of Two- and Four-headlamp Systems

The Effects of Rurality, Proximity of Other Traffic, and Roadway Curvature on High Beam Headlamp Use Rates March 2016

High-sensitivity, single-beam n(2) measurements.

We present a simple yet highly sensitive single-beam experimental technique for the determination of both the sign and magnitude of n(2). The sample is moved along the z direction of a focused Gaussian beam while the repetitively pulsed laser energy is held fixed. The resultant plot of transmittance through an aperture in the far field yields a dispersion-shaped curve from which n(2) is easily ...