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<tr><td nowrap valign="top" align="left"><b>Title:</b></td><td><br></td><td align="left" valign="top">Prospects for solar-pumped semiconductor lasers</td></tr>
<tr><td nowrap valign="top" align="left"><b>Authors:</b></td><td><br></td><td align="left" valign="top"><a href="http://adsabs.harvard.edu/cgi-bin/author_form?author=Landis,+G&fullauthor=Landis,%20Geoffrey%20A.&charset=ISO-8859-1&db_key=PHY">Landis, Geoffrey A.</a></td></tr>
<tr><td nowrap valign="top" align="left"><b>Affiliation:</b></td><td><br></td><td align="left" valign="top">AA(NASA Lewis Research Ctr)</td></tr>
<tr><td nowrap valign="top" align="left"><b>Publication:</b></td><td><br></td><td align="left" valign="top">Proc. SPIE Vol. 2121, p. 58-65, Laser Power Beaming, Jack V. Walker; Edward E. Montgomery; Eds. (<A href="http://www.spie.org">SPIE Homepage</a>)</td></tr>
<tr><td nowrap valign="top" align="left"><b>Publication Date:</b></td><td><br></td><td align="left" valign="top">05/1994</td></tr>
<tr><td nowrap valign="top" align="left"><b>Origin:</b></td><td><br></td><td align="left" valign="top"><a href="http://www.spie.org">SPIE</a></td></tr>
<tr><td nowrap valign="top" align="left"><b>Bibliographic Code:</b></td><td><br></td><td align="left" valign="top"><A href="http://adsabs.harvard.edu/abs/1994SPIE.2121...58L">1994SPIE.2121...58L</a></td></tr>
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<h3 align="center"> Abstract</h3>
Approaches are discussed for a direct solar-pumped semiconductor laser.
Efficiencies of 35% should be achievable, an order of magnitude better
than the efficiency achieved by other solar- pumped lasers. The output
wavelength of a semiconductor laser will be well matched to the optimum
conversion efficiency of a solar cell of the same material. Solar pumped
semiconductor lasers are thus an excellent candidate for space-based
energy transmission. Recently several designs for such lasers have been
proposed. A critical parameter is the sunlight intensity required for
lasing. This threshold has been calculated to be in the range of 2500 to
10,000 times solar intensity for conventional stripe laser designs,
depending on assumptions. Several approaches have been recently proposed
to reduce this threshold. The calculated minimum threshold is 25 - 50
times solar concentration, and could possibly be reduced even further
with use of light-trapping.
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