Discovery and characterization of optically pumped far-infrared laser emissions using laser magnetic resonance spectroscopy

摘要

A laser magnetic resonance spectrometer has been used to discover and subsequently measure a far-infrared laser emission: the 166.6-micron line of CH_2F_2, optically pumped by the 9P24 CO_2 laser. By recording spectra for the NH radical, the frequency of this laser emission has been determined to be 1799950 ± 13 MHz. Spectra for the NH radical were also recorded with two other far-infrared laser emissions: the 160.4-micron line of N_2H_4 (9P46 CO_2 pump) and the 328.6-micron line of ~(13)CH_3OH (9P12 CO_2 pump). From the NH spectra, a discrepancy of 2.1 GHz with the previously measured laser frequency was identified for the 160.4-micron line. A three-laser heterodyne system was then used to remeasure the frequency to be 1868475.5 ± 0.5 MHz. The NH spectra were also used to determine the frequency for the 328.6-micron line to be 912366 ± 7 MHz, in agreement with the value previously calculated from the Rydberg-Ritz combination principle.