A waveguide-type CO
2 laser was constructed, whose frequencies were stabilized and simultaneously swept by using Stark shifts of molecular spectral lines. The frequency of the laser was stabilized at the center of the inverted Lamb dip of a Stark line of NH
2D, and the frequency stability obtained was 1×10
-11 at the integration time of 250s. This stability was kept when the laser frequency was then swept by slowly varying Stark electric field applied to NH
2D. The swept range was as wide as the free spectral range of the cavity (340 MHz).
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