Theoretical analysis of transient gain phenomena in a fast-axial flow type CO/sub 2/ laser amplifier

Journal Article · Sun Jan 01 04:00:00 EST 1989 · IEEE J. Quant. Electron.; (United States)

DOI:https://doi.org/10.1109/3.16251· OSTI ID:6343111

Tsuchida, E; Sato, H ^[1]

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1. Dept. of Electrical Engineering, National Defense Academy, Yokosuka 239 (JP)

A decrease of output power was observed after discharging plasma tubes in a fast-axial flow (FAF) CO/sub 2/ laser amplifier with a short dwell time of about 1 ms. As as example, for the 10P (18) line at 50 torr pressure, the small-signal gain goes down from 1.308/m to 1.068/m within 135 s after discharging the plasma tubes, for a gasflow velocity of 180 m/s and discharge current of 60 mA. The fraction of power decrease is about 15 percent for the plasma length of 80 cm and the input power of 5 W. Dependences of the observed fraction of power down and the transient time to reach a stable power on input power and plasma length are theoretically analyzed by introducing the CO/sub 2/ dissociation factor as a function of gas-flow velocity, discharge current and plasma length, and gain saturation, resulting in good agreement between the experimental results and computation.

• OSTI ID: 6343111
• Journal Information: IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. 25:1; ISSN IEJQA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300 -- Engineering-- Lasers-- (-1989)
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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Heating
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AMPLIFICATION
AMPLIFIERS
CARBON DIOXIDE LASERS
COMPUTER CALCULATIONS
DATA
ELECTRONIC EQUIPMENT
EQUIPMENT
EXPERIMENTAL DATA
FLUID FLOW
GAIN
GAS FLOW
GAS LASERS
INFORMATION
LASER-PRODUCED PLASMA
LASERS
NUMERICAL DATA
PLASMA
PLASMA GUNS
THEORETICAL DATA
VELOCITY