Frequency chirp in a 10 ATM RF-excited CO/sub 2/ waveguide laser

Journal Article · Thu Dec 01 04:00:00 EST 1988 · IEEE J. Quant. Electron.; (United States)

DOI:https://doi.org/10.1109/3.14383· OSTI ID:6404074

Lovold, S ^[1]

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1. Norwegian Defense Research Establishment, N-2007 Kjeller (NO)

Various mechanisms causing frequency chirping in multiatmospheric pressure CO/sub 2/ lasers are discussed. The frequency chirp has been measured in a pulsed 10 atm RF excited CO/sub 2/ waveguide laser. It has been found that the dominating cause of the frequency chirp in this laser is heating of the gas by the RF discharge. The chirp increases with increasing RF input power. The chirp levels off at about 100-150 MHz/..mu..s for 25 kW of input power. The leveling off of the chirp is believed to be due to the negative lensing effect of the gas density perturbation. The effect of the anomalous dispersion on the chirp is observed when the laser is operated at the flanks of the CO/sub 2/ gain branches.

• OSTI ID: 6404074
• Journal Information: IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. 24:12; ISSN IEJQA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
AMPLIFICATION
CARBON DIOXIDE LASERS
FREQUENCY MODULATION
GAIN
GAS LASERS
LASERS
MODULATION
RF SYSTEMS
WAVEGUIDES