Other
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..664..634b&link_type=abstract
BEAMED ENERGY PROPULSION: First International Symposium on Beamed Energy Propulsion. AIP Conference Proceedings, Volume 664, pp
Other
2
Doped-Insulator Lasers And Other Solid State Lasers, Beam Characteristics: Profile, Intensity, And Power, Spatial Pattern Formation, Efficiency, Stability, Gain, And Other Operational Parameters
Scientific paper
A 20 kHz, 100-MW average power, pulsed 1.6-μm Pr+3:LaCl3 up-conversion laser for space propulsion, pumped at high intensity by a continuous 212-MW, 2.026-μm He/Ar/Xe nuclear-pumped laser, is proposed. 1.6 μm falls within the 1.72 μm > λ > 1.53 μm atmospheric transmission window and is sufficiently distant from 1.4 μm to be relatively eye safe. The high pulse rate minimizes dribble and thus maximizes specific impulse. The nuclear-pumped laser is also a steady-state nuclear reactor. The Pr+3:LaCl3 solid-state laser combines the many small beams produced by the reactor-laser with high beam quality. It consists of an array of face-pumped thin disks at Brewster's angle, face-cooled by high-pressure turbulent helium. The inhomogeneities introduced by the disk array are corrected by using a double pass geometry with a phase-conjugate mirror, as suggested by Magda. The fraction of the pump energy extracted from the Pr+3:LaCl3 laser is 47% at a pump intensity of 2×105 W/cm2. The He/Ar/Xe laser is 0.4% efficient, giving an overall efficiency of 0.2%, equivalent to ~0.8% if electrically pumped.
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