ABSTRACT
An off-axis spherical mirror is used to correct an astigmatic, non-Gaussian beam from a pulsed, frequency-doubled Nd:YAG laser. The beam is then spatially filtered by a series of two pinholes to make the beam near Gaussian.
ABSTRACT
The effects of temperature and pressure on the stability of a high-finesse interferometer are considered, and the design of a high-finesse interferometer that minimizes these effects is presented. The high-finesse interferometer has a free spectral range of 23,600 MHz, a finesse of greater than 30,000, and a measured stability of better than 7 MHz/h (0.3 mfringes/h).
ABSTRACT
Mycelium of Pleurotus ostreatus var. florida with a decreased growth rate contained seven double-stranded RNA segments and isometrical virus particles with diameters of 24 and 30 nm. Mycelium with a normal growth rate lacked dsRNA. Protoclones from virus-containing mycelium contained one to seven of these dsRNA segments in varying concentrations. The exact correlation between slow growth and the presence of dsRNA molecules could not be established. Infection of virus-free protoplasts with PEG-precipitated virus particles resulted in mycelium that stably maintained the 2.4 kbp dsRNA.
Subject(s)
Polyporaceae/virology , RNA Viruses/isolation & purification , RNA, Double-Stranded/analysis , Electrophoresis, Agar Gel , Microscopy, Electron , Molecular Weight , Polyporaceae/physiology , RNA Viruses/genetics , RNA Viruses/ultrastructure , RNA, Double-Stranded/isolation & purificationABSTRACT
Recent developments in tunable laser diodes now make it possible to do injection seeding of a quantum-limited Raman amplifier. We present data from an experiment in which a tunable laser diode in the visible was injected into a Raman amplifier with a coupling efficiency of 65% +/- 45%. This efficiency approaches the theoretical limit of 100% and is much larger than the 0.1-0.2% coupling efficiency reported in the literature for a comparable experiment when an infrared laser diode is used.
