<s>
A	O
Raman	B-Algorithm
laser	I-Algorithm
is	O
a	O
specific	O
type	O
of	O
laser	O
in	O
which	O
the	O
fundamental	O
light-amplification	O
mechanism	O
is	O
stimulated	B-Algorithm
Raman	I-Algorithm
scattering	I-Algorithm
.	O
</s>
<s>
Raman	B-Algorithm
lasers	I-Algorithm
are	O
optically	O
pumped	O
.	O
</s>
<s>
Rather	O
,	O
pump	O
photons	O
are	O
absorbed	O
and	O
"	O
immediately	O
"	O
re-emitted	O
as	O
lower-frequency	O
laser-light	O
photons	O
(	O
"	O
Stokes	O
"	O
photons	O
)	O
by	O
stimulated	B-Algorithm
Raman	I-Algorithm
scattering	I-Algorithm
.	O
</s>
<s>
In	O
optical	B-Architecture
fibers	I-Architecture
made	O
of	O
silica	O
,	O
for	O
example	O
,	O
the	O
frequency	O
shift	O
corresponding	O
to	O
the	O
largest	O
Raman	O
gain	O
is	O
about	O
13.2	O
THz	O
.	O
</s>
<s>
The	O
first	O
Raman	B-Algorithm
laser	I-Algorithm
,	O
realized	O
in	O
1962	O
,	O
by	O
Gisela	O
Eckhardt	O
and	O
E.J.	O
</s>
<s>
Various	O
other	O
gain	O
media	O
can	O
be	O
used	O
to	O
construct	O
Raman	B-Algorithm
lasers	I-Algorithm
:	O
</s>
<s>
The	O
first	O
continuous-wave	O
Raman	B-Algorithm
laser	I-Algorithm
using	O
an	O
optical	B-Architecture
fiber	I-Architecture
as	O
the	O
gain	O
medium	O
was	O
demonstrated	O
in	O
1976	O
.	O
</s>
<s>
They	O
are	O
inscribed	O
directly	O
into	O
the	O
core	O
of	O
the	O
optical	B-Architecture
fiber	I-Architecture
used	O
as	O
the	O
gain	O
medium	O
,	O
which	O
eliminates	O
substantial	O
losses	O
that	O
previously	O
arose	O
due	O
to	O
the	O
coupling	O
of	O
the	O
fiber	O
to	O
external	O
bulk-optic	O
cavity	O
reflectors	O
.	O
</s>
<s>
Nowadays	O
,	O
commercially	O
available	O
fiber-based	O
Raman	B-Algorithm
lasers	I-Algorithm
can	O
deliver	O
output	O
powers	O
in	O
the	O
range	O
of	O
a	O
few	O
tens	O
of	O
Watts	O
in	O
continuous-wave	O
operation	O
.	O
</s>
