Spatial Distribution Of Laser Beam Research Articles

Beam propagation in an injection-controlled copper vapor laser system

Far-field intensity distribution as well as its temporal evolution of the output from a copper vapor laser oscillator at different operating conditions are measured in detail. Experimental observation has been performed about the influence of delay time between the oscillator and amplifier on the far-field intensity distribution of the output from the amplifier. Beam propagation in an injection-controlled copper vapor laser system has been investigated on account of thermal lens effect. The application of a single-pass unfolded amplifier model has been successfully demonstrated to describe beam propagation in the power oscillator by the temporal measurement. It has been found that the thermal lens effect greatly influences the spatial distribution of laser beam from an injection-controlled system.

Light scattering by photoinduced domains in lithium niobate crystals

Illumination of thin z-cut plates of LiNbO3 crystals by an active radiation beam (γ = 0.44 μm) of weak power (PL = 10-20 mW) can induce appearance of a microdomain array (ND = 106 cm-2). The microdomains have the shape of needles directed along z-axis with average length of 1000-2000 μm and diameter ∼1 μm. The special type of conical scattering has been observed. Its peculiarities differ from those of photorefractive light scattering with cone of synchronism. The effect of unlocality of photoinduced domain forming that concerned to the spatial distribution of laser beam has been found. The correlation between the structure rebuilding process and the charge transfer at ferroelectric crystal surface has been established.