DocumentCode :
1149033
Title :
A stabilized mode-locked Nd:YAlG laser using electronic feedback
Author :
Kinsel, Tracy S.
Author_Institution :
Bell Telephone Laboratories, Murray Hill, NJ, USA
Volume :
9
Issue :
1
fYear :
1973
fDate :
1/1/1973 12:00:00 AM
Firstpage :
3
Lastpage :
8
Abstract :
Techniques for constructing a stable mode-locked Nd:YAlG laser source suitable for long term unattended operation are described. These techniques involve the use of two types of electronic feedback loops-the oscillator loop and the servo loop. An additional auxiliary loop to provide for long term operation is described and demonstrated. The detuning properties of the mode-locked laser, using both intracavity loss and phase modulation, are obtained experimentally for the open loop. It was found that the loss-modulated mode-locked laser was noisy due to relaxation oscillations. However, the use of a phase-modulated mode-locked laser presented other problems due to the possibility of a spontaneous 180 ° switch in envelope phase of the pulses. A technique for quenching this phase switching is described. The results of applying these techniques led to the experimental demonstration of a mode-locked Nd : YAlG laser that operated for long times (48 h), with an error rate (dropping a pulse or mistiming of a pulse) of 1.4 \\times 10^{-10} , with and rms variation of 8.2 percent in the second harmonic at 0.53 μm and with an absence of relaxation oscillation.
Keywords :
Feedback loop; Laser feedback; Laser mode locking; Laser stability; Neodymium; Optical pulses; Oscillators; Phase modulation; Servomechanisms; Switches;
fLanguage :
English
Journal_Title :
Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9197
Type :
jour
DOI :
10.1109/JQE.1973.1077382
Filename :
1077382
Link To Document :
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