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A thermal phase‐locked loop for frequency stabilization of internal‐mirror He‐Ne lasers (λ=0.633 μm)

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2 Author(s)
Chien, Pie‐Yau ; Institute of Electro‐Optical Engineering, National Chiao‐Tung University, 1001 Ta Hsueh Road, Hsinchu, Taiwan 30050, Republic of China ; Ci-Ling Pan

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A new servo circuit based on the thermal phase‐locked loop (TPLL) has been developed for frequency stabilization of internal‐mirror He‐Ne laser. A feedback signal proportional to the fluctuation in the frequency of the laser is down‐converted through a voltage‐controlled oscillator (VCO) and compared in a phase/frequency circuit with that of a frequency reference. The detected phase difference then drives a heater wrapped around the laser tube for tuning the laser cavity length. The frequency stability achieved is ±1.0×10-9 over a period of several hours.

Published in:

Review of Scientific Instruments  (Volume:62 ,  Issue: 4 )