High-power diode-bar end-pumped Nd:YLF laser at 1.053 microm.

We describe efficient cw operation of a Nd:YLF laser end pumped by two beam-shaped 20-W diode bars on the 1.053-microm transition. Fundamental transverse-mode operation with output power of 11.

Experimental investigation of resonant enhancement of the acoustic interaction of optical pulses in an optical fiber.

The acoustic interaction of optical pulses in optical fibers is investigated directly by time-resolved pump-probe measurements of the transmission of a fiber Sagnac-loop interferometer. Resonant enhancement of the refractive-index change deltan(ac) induced by the acoustic waves is observed when the repetition frequency of the pulse train is close to a vibrational eigenfrequency of the fiber. For standard fiber deltan(ac) is enhanced by a factor of ~3 at the 465-MHz eigenmode frequency, and this factor increases to ~10 when the polymer jacket is removed from the fiber.

Measurement of the refractive-index modulation generated by electrostriction-induced acoustic waves in optical fibers.

The refractive-index modulation generated in optical fibers by electrostriction-induced acoustic waves is investigated directly by a pump-probe measurement technique in a 1-km-long fiber Sagnac-loop interferometer. Pump pulses propagating unidirectionally around the loop generate transverse acoustic waves that produce a time-dependent relative phase shift for the probe pulses. The consequent interferometer transmission changes are used as a measure of the acoustic interaction.

Dilaceration of a primary tooth.

A case is presented in which a non-vital maxillary primary incisor failed to resorb, its root apex appeared in the labial sulcus and further investigation showed it to be dilacerated.

Coexistent Tk and VA polyagglutinability.

Serologic investigations of the red blood cells of two patients indicated polyagglutination as the cause of compatibility problems. Lectin studies to classify the variety of polyagglutination demonstrated the simultaneous exposure of two latent membrane receptors, Tk and VA. It is proposed that different bacterial enzymes were responsible.