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Updated: Feb 6, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
Published on: December 18, 2015
Iodine-stabilized high resolution dual-frequency Ti: sapphire laser
Abstract:
A dual frequency Ti: sapphire laser is presented in which two lines operate simultaneously with the same intensity on two TM00 longitudinal modes. This operation is obtained by means of the 127I2 molecules contained in an intra-cavity cell, pumped by a low-power laser. Its properties are interesting: the two lines lase simultaneously, they overlap spatially, their spectral width could be very narrow, their frequency is automatically locked to molecular frequencies and can serve as a frequency reference, the frequency difference is adjustable over the thousands of rotational or vibrational molecular energy gaps in the 0.1-0.9 THz and 3-6 THz domains, and it is computable with high precision. THz wave production is demonstrated as a first application.
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