Appeal No. 2005-0616 Page 9
Application No. 09/661,653
Excitation means in the form of light source 22, positioned in close proximity to
cell 12 provides a source of excitation energy to the active material flowing through the
cell. The light source may take the form of a high pressure Xenon filled lamp which is
controlled by an external circuit (not shown). The walls of cell 12 are constructed of
quartz or other material which transmits radiation with negligible attenuation at the
frequency required to excite the active material.
The laser further comprises a centrifugal pump 24 for circulating the liquid active
material through the laser and heat exchanger 26 which cools the liquid after it flows out
of cell 12. Lines 28, 30 and 32 interconnect pump 24, heat exchanger 26 and cell 12.
Chun
Chun's invention pertains to pulsed gas lasers. More particularly, Chun's
invention pertains to means for circulating the gas within a pulsed gas laser. Chun's
invention uses "acoustic obstacles" to circulate the gas in the pulse discharge gas laser.
The acoustic diodes consist of passive mechanical diodes located within the gas filled
chamber of the laser, which obstacles exhibit an asymmetrical resistance to the
passage of the compression wave generated by the discharge of electrical current
through the gas. Because the obstacles exhibit less resistance to the passage of the
compression wave in one direction as compared to the opposite direction, the obstacles
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