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Self-Modelocking of Solid-State Lasers with II-VI Intracavity Crystal

IP.com Disclosure Number: IPCOM000105070D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

McAuliffe, EA: AUTHOR [+3]

Abstract

Disclosed is the addition of a nonlinear crystal in a solid state laser cavity to achieve self-start modelocked operation. The laser cavity design will produce shorter and higher power optical pulses compared to previous efforts [1]. These mprovements are due to an enhanced pumping scheme of the gain medium and the introduction of a II-VI crystal with a higher nonlinearity.

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Self-Modelocking of Solid-State Lasers with II-VI Intracavity Crystal

      Disclosed is the addition of a nonlinear crystal in a solid
state laser cavity to achieve self-start modelocked operation.  The
laser cavity design will produce shorter and higher power optical
pulses compared to previous efforts [1].  These mprovements are due
to an enhanced pumping scheme of the gain medium and the introduction
of a II-VI crystal with a higher nonlinearity.

      The figure shows a Spectra-Physics tightly-folded
resonator(TFR) [2], which consists of ten 1 Watt diodes focussed by a
cylindrical lens on the gain medium.  The TFR provides the gain
medium nearly twice the pump power than of Ferguson's design [1].
The resonator also consists of a nonlinear II-VI crystal, at
Brewster's angle, with two mirrors (M2 and M3) to focus the light
through it.  The angles between the mirrors and the optical axis are
such to compensate for astigmatic aberrations.  The aperture is added
to enhance preferential gain for the higher intensity portions of the
beam.

      The choice of a nonlinear medium was made by considering the
third-order nonlinearity ( n sub 2 ), the damage threshold of the
crystal and its optical quality.  It has been shown [  1 ]  that  n
sub 2 increases dramatically when the two-photon absorption energy is
slightly below the bandgap energy.  At 1.054  mu M the band edge
enhanced nonlinearity of CdS is  280-300 x 10 sup -13 esu , which is
more than two orders of magnitude greater than the glass used
previously [1].  At 1.3 mu  M, other II-VI crystals such as Teluride
CdMg sub .6 Te sub .4 , have even higher nonlinearities than CdS.
II-VI crystals, such as CdS, have high damage thresholds, comparable
to that of glass, and...