DocumentCode :
1136935
Title :
Pulsed CO2laser with double modulation
Author :
Karlov, N.V. ; Konev, Yu B. ; Koozmin, G.P. ; Prokhorov, A.M.
Author_Institution :
The Lebedev Institute of Physics, Moscow, USSR
Volume :
5
Issue :
3
fYear :
1969
fDate :
3/1/1969 12:00:00 AM
Firstpage :
137
Lastpage :
139
Abstract :
For the pulse pumped CO2laser we used Q-switching to investigate inversion kinetics. The pump was synchronized with the Q-switching mirror. It was possible to obtain the Q-switch pulses at any phase of the pump pulse. The repetition rate was 50 Hz and the pump pulse duration was 4 or 10 ms. It was found that there is an optimum delay in switching the cavity Q-factor after the discharge started. The giant pulse intensity increased several times after the discharge was switched from CW to pulses. The inversion rise time was 1-2 ms and its lifetime was strongly dependent on the discharge current, due to plasma heating during the current pulse. Increasing the helium percentage in the discharge prolonged the inversion lifetime because of high thermal conductivity of helium gas. Gaseous BCl3was chosen to obtain the CO2laser giant pulses with bleachable filter. The vibronic frequency V3of the B11Cl3molecules coincides with the P lines of the CO2laser. Rarer B10Cl3corresponds to less active R lines. Pure BCl3did not give the giant pulses. Adding helium to the BCl3cell gave the pulses. The best results came from adding very small amounts of ammonia NH3because of the effective vibrational energy transfer between colliding BCl3and NH3molecules.
Keywords :
Delay; Frequency synchronization; Helium; Kinetic theory; Laser excitation; Mirrors; Optical pulses; Pump lasers; Q factor; Thermal conductivity;
fLanguage :
English
Journal_Title :
Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9197
Type :
jour
DOI :
10.1109/JQE.1969.1075741
Filename :
1075741
Link To Document :
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