We have achieved a simple and precise frequency stabilization technique for commercially available 1mW, 850nm
vertical cavity surface emitting laser (VCSEL) based on optical heterodyne beat frequency control by introducing two
sets of frequency stabilized VCSEL's with Fabry-Perot resonator (FPR) as frequency discriminator. The stabilized
VCSEL's were quite similarly fabricated with each other, in which the electrical negative feedback was supplied for
stabilization. We have also detected optical heterodyne beat between these two VCSEL's by adjusting the locking
frequency of each VCSEL. Thus, we have further reduced the frequency fluctuations from these stabilized VCSEL's by
controlling their feedback current so that the variation in the optical beat frequency should be minimized. As a result, we
have successfully suppressed the amount of optical beat frequency fluctuations within 2MHz at measuring time of 1 sec.
That is, the attained Allan variance is within the order of 10-9. In this work, we have achieved simple and inexpensive
and precise frequency stabilization for 850nm VCSEL by optical heterodyne beat frequency control, which is quite
applicable to nanomanufacturing.
We have demonstrated a compact and inexpensive frequency stabilization technique for commercially available 1mW,
850nm Vertical Cavity Surface Emitting Laser (VCSEL) using a Fabry-Perrot Resonator (FPR) as frequency standard.
We have performed frequency discrimination using a transmitted light from FPR, and frequency stabilization has been
carried out by electrical negative feedback to injection current. Optical frequency fluctuation of VCSEL is estimated by
error signal, and its stability is evaluated by Allan variance. We have achieved to detect optical beat frequency signal of
850nm type VCSEL for the first time, by fabricating two sets of frequency stabilized VCSEL, which are quite similar
with each other by controlling each locking frequency. We have estimated VCSEL's frequency accurately fluctuations
from the beat signal. As a result, we have successfully suppressed the amount of frequency fluctuations for the
free-running VCSEL of as much as 600MHz to be within 80MHz. In this paper, we propose compact, inexpensive and
precise frequency stabilization for 850nm VCSEL, and describe an accurate method for estimating its fluctuations.
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