Single-mode pump power source
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United States of America Patent
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Jul 1, 2003
Grant Date -
N/A
app pub date -
Dec 11, 2000
filing date -
Dec 11, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The mode and wavelength of a conventional, multi-mode, wide-stripe laser diode is converted in an Nd.sup.3+ ion-doped laser host crystal to a stable, single-mode output that falls within the spectral region required for pumping EDFA amplifying structures. The host crystal absorbs radiation from the diode that corresponds with the .sup.4 I.sub.9/2.fwdarw..sup.4 F.sub.5/2 absorption band of its Nd.sup.3+ ions, and re-radiates into the .sup.4 F.sub.3/2.fwdarw..sup.4 I.sub.9/2, .sup.4 F.sub.3/2.fwdarw..sup.4 I.sub.11/2, and .sup.4 F.sub.3/2.fwdarw..sup.4 I.sub.13/2 transitions which release photon energy that can be utilized by amplifying structures doped with Er.sup.3+ and/or Yb.sup.3+. The spatial mode of the multimode laser diode is converted to single-mode by enclosing the Nd.sup.3+ -doped host laser crystal within a laser cavity that has a fundamental mode size large enough to encircle the spatial extent of the beam emanating from the laser diode.
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