Appeal No. 2005-0616 Page 12
Application No. 09/661,653
gas through the obstacles in the direction indicated by arrows 12 in Figure 3. In order to
cause the gas to circulate through the heat exchanger and the active region, as
depicted in Figure 1, the obstacles 8 all are oriented so that the openings of the cups
face downstream to the flow of the gas.
Scheps
Scheps' invention relates to tunable lasers which produce laser emission at one
or more wavelengths over a preselected wavelength range. Tunable lasers are lasers
which have the capability of emitting one or more wavelengths over a broad range of
wavelengths. These lasers are continuously tunable over a preselected range of
wavelengths and differ from non-tunable lasers which emit at certain fixed, discrete
wavelengths.
A first embodiment of a tunable laser 10 in which the gain element is used as a
tuning element is illustrated in Figure 2. The tunable laser 10 has its laser gain element
11 pumped by an argon ion laser 12. The laser gain element is an exemplary
Ti3+-activated sapphire host crystal to produce a laser beam or emission which can be
tuned within the wavelength range of about 700 nm to 850 nm.
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