Optoelectronic sensor of longitudinal and angular displacements

In the sensor a triangulation method of displacement measurement has been used. A method of sensor calibration using interferometric distance measurements has been elaborated. Linearity and resolution investigations have been performed for different parameter sets of sensor transmitting-receiving head. An accuracy of displacement measurements depends on parameters of a beam illuminating a surface being displaced, parameters of a position sensitive detector and on a signal-to-noise ratio of a signal analog processing block. Results of investigations of uncertainties of lathe slide shifts are also presented

Generation of nearly nondiffracting Bessel beams with a Fabry–Perot interferometer

A new concept for generating zero-order Bessel beams was studied theoretically. The spatial intensity distribution was calculated numerically using a wave optics model. Approximate analytical expressions were derived to describe the radial intensity distribution in planes perpendicular to the optical axis of an imaging lens.Texas InstrumentsNational Science FoundationOTKA Foundation of the Hungarian Academy of Science

1.3-μm Nd:YVO4 laser Q-switched and mode-locked by V:YAG saturable absorber

Diode-pumped solid-state lasers at 1.3 um are presented. Q-switching and mode-locking with V:YAG saturable absorber is reported