Precise Frequency Measurements in Submillimeter and Infrared Region

As a result of frequency stabilization of all the lasers and microwave oscillators in a new multiplication chain consisting of HCN (337 ¿m), D2O (84 ¿m), CO2/OsO4 (10.53 ¿m), CO2 (10.18 ¿m), and He-Ne/CH4 (3.39 ¿m) lasers signals up to 88 THz have been synthesized with high precision. Owing to phaselocking of HCN and D2O lasers to the primary frequency standard synthesis accuracy of ~1013 up to 30 THz has been achieved for the first time. The frequency of the CO2/OsO4 laser was first measured ¿OsO4 = 28 464 676 938.5 ± 1 kHz and the He-Ne/CH4 laser frequency was determined to be ¿CH4 = 88 376 181 586 ± 10 kHz.