<s>
A	O
holographic	B-Algorithm
grating	I-Algorithm
is	O
a	O
type	O
of	O
diffraction	O
grating	O
formed	O
by	O
an	O
interference-fringe	O
field	O
of	O
two	O
laser	O
beams	O
whose	O
standing-wave	O
pattern	O
is	O
exposed	O
to	O
a	O
set	O
of	O
photosensitive	O
materials	O
.	O
</s>
<s>
With	O
the	O
expertise	O
earned	O
over	O
the	O
years	O
,	O
nowadays	O
holographic	B-Algorithm
gratings	I-Algorithm
are	O
very	O
efficient	O
with	O
no	O
notable	O
difference	O
when	O
compared	O
to	O
mechanically	O
ruled	O
gratings	O
.	O
</s>
