By coupling a CW C02 and a TEA CO2 laser through a grating simultaneously used for both
resonators, without any additional optical elements, the CW laser radiation was injected without loss
into the TEA CO2 laser optical cavity. Thus, longitudinal and transverse single mode operation of
the TEA CO2 laser was achieved successfully without any intracavity limiting apertures an evident
by the smooth shape of detected pulses. Furthermore, a 3x3 cm cross section single mode beam with
unaffected energy of about 4 J/pulse was obtained. This specially designed array due to its observed
spectral coincidence of CW radiation and pulsed emission indicates exact alignment of injected CW
radiation with the optical axis of TEA CO2 laser resonator without significant angular deviation.
Slight radial deviation, however, did not have any detectable destructive effect on the single mode
output signals. This compact and simple structure single mode TEA CO2 laser with its stability and
simple adjustability can be very useful particularly for portable units such as atmospheric lidar
instruments.© (2005) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.