Page 7 - PR 2014 2016 02 Lasers Technology

Lasers Technology | Progress Report 21

and 10mm long were prepared
with fixed Er concentration (0.5
mol%) and 1, 2, 5, 7 and 10 mol%
of Yb.

Because of the suitable optical
properties of alkaline-earth fluo-
rides - CaF , SrF , BaF , MgF , MnF ,
2 2 2 2 2
this family of crystals, in particu-
lar the CaF , is commonly used to
2
build commercial optics and de-
vices in the ultraviolet as well as
in the infrared spectral domain.
They also found application also
as laser hosts. The growth of
BaF single crystal fibers, doped
2
with rare earth ions (Pr , Tm )
3+
3+
for spectroscopic studies aiming Fig 3 – Experimental equilibrium phase diagram of quasi-binary system Li W O 7
2
2
– La W O studied at CLA and doped single crystal fibers obtained from this data.
2
2
to the development of compact LiLa(WO ) is formed at x = 0.52 and decomposes peritetically at 1000°C. The dashed
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4 2
laser systems, was performed lines describe the influence on the liquidus by doping with Gd (red) and Yb (blue).
(Figure 3). The equilibrium of
thermal conditions for the pull-
ing of regular and homogeneous BaF single
2
crystal fibers was defined for the micro pull-
ing down technique on resistive mode. The
effect of the atmosphere (Ar/CF ), and, the
4
appropriate mixture balance to assure the
reactive atmosphere efficiency and the ap-
propriate capillary stability were determined
empirically. The dopant distribution and their
influence on the optical and structural quality
of the growth of the fluoride single crystal
fiber are under investigation (Figure 4).

Fig 4 –BaF single crystal fibers grown by micro-pulling down method.
2