ABSTRACT
The dependence of the far-field distribution of an externally injection-locked array on the width and power of the injected beam was determined by numerical simulation. The fraction of total power contained in the diffraction-limited lobe portion of the far field was significantly larger for wide-beam injection (95%) than for single-point injection (70%). Qualitative agreement with experimental results using a 20-element array was observed.
ABSTRACT
We have developed a computer model of injection-locked gain-guided semiconductor arrays to explain some experimental observations: the creation of a single-lobed far field from a normally double-lobed far field; the increase in the divergence angle of the far-field lobe(s); the shifting of power from one off-axis lobe to the other; and the regression back to a double-lobed far field when the ratio between array power and injection power becomes too large. The model is then extrapolated to look at properties of the index-guided case: inefficient end-element injection but an on-axis single-lobed center-element injection.
Subject(s)
Jaundice, Neonatal/etiology , Milk, Human , Breast Feeding , Female , Humans , Infant, Newborn , MaleABSTRACT
The theoretical investigations and experimental verifications of resonant modes of optically pumped solid host face-pumped lasers (FPL) are discussed. The conditions for a single transverse-mode operation for electrooptically Q-switched neodymium glass and YAG lasers are examined in both stable and stable/unstable resonator configurations. Resonant mode computations were made, based on a Gaussian quadrature and a complex non-Hermitian matrix program.
ABSTRACT
The crossed Porro prism configuration improves the stability of the alignment of the laser resonator; however, the resultant phase shift alters the characteristics of the electrooptical Q-switch. An analysis of the operational characteristics, such as variable outcoupling, extinction ratio, and prelasing boundaries, is presented along with experimental data. An electrooptically Q-switched Nd:YAG laser with a crossed Porro prism resonator, which successfully withstands severe physical environments, has been developed and demonstrated.