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Recent developments in coaxial electron-beam pumped VUV lasers are reported. The production of tunable-frequency sub-picosecond pulses by transient stimulated Raman scattering and the extension of electron-optical chronoscopy to subpicosecond time resolution and to XUV and X-ray wavelengths are described.
It is over a decade since picosecond laser pulses were first produced by passive modelocking of a giant-pulse ruby laser by Mocker and Collins [2.1] in 1965 and then Nd: glass lasers by DeMaria et al. [2.2] in 1966. Since then the techniques for the generation of these pulses have been developed to the extent that it is possible to reliably produce pulses of bandwidth-limited durations of — 1 ps from...
How do temporal and eternal beliefs interact? I argue that acquiring a temporal belief should have no effect on eternal beliefs for an important range of cases. Thus, I oppose the popular view that new norms of belief change must be introduced for cases where the only change is the passing of time. I defend this position from the purported counter-examples of the Prisoner and Sleeping Beauty. I distinguish...
The Doomsday Argument says we should increase our subjective probability that Doomsday will occur once we take into account how many humans have lived before us. One objection to this conclusion is that we should accept the Self-Indication Assumption (SIA): ’Given the fact that you exist, you should (other things equal) favor hypotheses according to which many observers exist over hypotheses on which...
Developments of the coaxial-diode VUV laser are reviewed. Frequency narrowing to 0.1nm and tuning over a range of 2500 cm−1 has been achieved with megawatt powers. A peak energy of 55 mJ (5 MW) is obtained with a pumping energy of 35J. The breakdown threshold in 10K Torr Xenon has been measured to be ∼ 100 MW cm−2. Picosecond pulses at λ 173nm have been generated, by four-wave mixing, for amplification...
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