Abstract
The spectral emission of a mid-infrared diode laser at 10 μm is investigated by two different techniques. The fringes of a high finesse confocal etalon and the beats with a stabilized carbon dioxide laser are recorded. The conjugate effects of electronic frequency stabilization by using low-pressure gas molecule absorption and the controlled optical feedback in an external cavity are shown. The linewidth is reduced from 65 to 20 MHz.
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