High Resolution Frequency Measurements of Far-Infrared Laser Lines

摘要

The frequency of four previously reported far-infrared laser lines have been measured to an accuracy of 100 kHz. These laser lines were measured using a heterodyne system which allowed for more accurate measurement. The four far-infrared laser lines which originated from Formic Acid (HCOOH), O-Deutero- Formic Acid (HCOOD), C-Deutero- Formic Acid (DCOOH), and Methyl Chloride (CH3Cl) were optically pumped by an ultra-stable, grating-tunable, CO2 laser. Previous measurements had been conducted using Fabry-Perot cavities not typically known for their high accuracy. The difference between the frequencies measured here and the listed frequencies for these laser lines ranged from 59 MHz to 3.9 GHz.