  Optical techniques for precise and repeatable spectroscopy of
ytterbium-isotope-171 ion ($^{171}\mathrm{Yb}^{3+}$) hyperfine structure were
studied. Large energy spacing of $^{171}\mathrm{Yb}^{3+}$ regarded as the main
motivation for state preparations required for quantum memory and transducer
applications promoted us to develop stabilization and control of optical
frequencies of lasers simultaneously over a wide range of 3 gigahertz's. We
also built our own 2.7 kelvins cryogenic system for radio-wave assisted optical
spectroscopy. We attained to high resolution and sensitivity both in pump-probe
saturation spectroscopy and Raman heterodyne spectroscopy. The first one gave a
high resolution spectrum of hyperfine structure, and the second one enabled to
detect paramagnetic spin resonance efficiently for wide ranges of
radio-frequency. As the Raman heterodyne process of our interest is the
up-conversion of transductions, we made efforts at optimizing sensitivity of
Raman heterodyne detections with selecting the best crystal orientation and
with efficient radio-wave coupling for future applications toward photon
transducer.
