Title :
Line narrowing and frequency stabilization of high-pressure CO2 laser by means of injection locking with multi-isotope master oscillator
Author :
Suda, Akira ; Tashiro, Hideo ; Kawaguchi, Shigeru
Author_Institution :
RIKEN, Inst. of Phys. & Chem. Res., Saitama, Japan
fDate :
11/1/1994 12:00:00 AM
Abstract :
By seeding radiation from a multi-isotope CO2 master oscillator, single-longitudinal-mode operation of a high-pressure CO2 laser with conventional isotopes was realized even at the valley of its gain spectrum between adjacent lines. Spectral characteristics were investigated by the heterodyne detection technique and the frequency up-shift and the subsequent down-chirp were identified as a result of transient refractive index change caused by electron density decay during the build-up of laser pulses. The system was coupled with an electronic feedback loop, and attained the frequency stability of less than ±5 MHz
Keywords :
carbon compounds; chirp modulation; electron density; gas lasers; isotope effects; laser frequency stability; laser modes; laser tuning; optical frequency conversion; refractive index; spectral line narrowing; CO2; build-up; down-chirp; electron density decay; electronic feedback loop; frequency stability; frequency stabilization; frequency up-shift; gain spectrum; heterodyne detection technique; high-pressure CO2 laser; injection locking; laser pulses; line narrowing; multi-isotope CO2 master oscillator; seeding radiation; single-longitudinal-mode operation; spectral characteristics; transient refractive index change; Electrons; Feedback loop; Frequency; Isotopes; Laser feedback; Laser transitions; Optical pulses; Oscillators; Refractive index; Stability;
Journal_Title :
Quantum Electronics, IEEE Journal of
