5.3
Gate
option
Before
turning
the
laser
diode
on
you
must
connect
the
photo
-
sensor
between
the
PDC
(cathode)
and
the
GND
(anode)
pins
at
the
laser
connector.
After
this
you
should
test
whether
the
sensor
is working
.
For
this
step,
run
the
laser
and
check
with
the
LPCA
command
(laser
photo
-
current
actual).
The
default
maximum
photo
current
is
700
µA,
but
can
be
increased
on
request.
Enter
your
target
photo
-
current
with
the
LPCT
command.
Initiali
z
e
the
photo
-
current
control
mode
by
the
command
LPCCR
(laser
photo
current
control
run).
Now
you
can
run
and
stop
the
laser
by
LR
and
LS
.
As
soon
as
you
start
the
laser
the
driver
begins
continuously
to
track
and
control
the
photo
current.
The
second
step
is
to
adjust
the
power
coefficients
so
that
you
can
use
power
values
in
Watt
s
.
For
this
, do as follows:
• adjust
the
LPT
value
(laser
power
target),
it
should
have
a
typical
or
a
maximum
value
•
r
un
the
laser
in
normal
CW
mode
and
s
et
the
current
to
the
point that the
laser
emits
exact
the
target
laser
power.
An
external
power
meter
is
necessary
for
this.
Now
execute
the
LPF
command
to
fix
the
actual
photo
-
current
value
to
this
laser
power.
You can n
ow
you
can
get
the
laser
power
by
the
command
LPA
,
set
the
power
target
by
the
LPT
command,
run
the
power
control
mode
by
the
LPCCR
command.
Start
and
stop
the
laser
by
LR
and
LS
.
5.3 Gate
O
ption
There is a gate option which can be used in CW mode as well as in internal digital
modulation mode. You may switch on and off the internally generated laser current by the
modulation input. Optionally, a separate gate pin may be used. In this case the gate
option is also available in the external modulation modes. The gate option is activated
by the command LGR and deactivated by LGS. Additionally, the LMDXNR command can
be used to negate the modulation input.
5.4 Modulation
M
odes
The
modulation
modes
can
be
selected
in
the
laser
menu.
Changing
modulation
modes
turns
off
the
laser.
You
may
start
the
laser
again
the
main
menu.
Please
note
that
the
preparations—as
described
in
—have
to
be
done
first.
In
modulation
modes
the
measured
currents
and
voltages
displayed
in
the
main
19
