Low divergence laser apparatus
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United States of America Patent
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Mar 15, 1988
Grant Date -
N/A
app pub date -
Jul 18, 1986
filing date -
May 27, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A low divergence laser oscillator of the kind wherein an intra-cavity oscillator beam is propagated along a resonator axis and within a portion of the volume of the active medium and wherein a part of the intra-cavity oscillator beam intensity is coupled out of the oscillator by a first outcoupler as an extra-cavity beam. One of the oscillator beam is expanded and collimated so as to produce an expanded and collimated extra-cavity beam having a cross-sectional area substantially greater than the cross-sectional area of a portion of the active medium. Substantially the total intensity of the expanded collimated extra-cavity beam is introduced into the active medium so as to fill a volume of the active medium which is substantially greater than the volume of the above portion, thereby giving rise to amplification of the reintroduced beam. A polarizing element located within the resonator is used for the introducing. The intra-cavity beam is either transmitted through or reflected by the polarizing element while the extra-cavity beam is directed onto the polarizing element or transmitted therethrough without passing through said first outcoupler, a second outcoupling means being provided for coupling out the amplified beam.
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