2. Production Operation
A: CW Mode
To operate the laser in CW mode the Red, Black, Yellow and Blue Leads should be connected to
the following:
1. Red Lead: +8Vdc ±500mV
2. Black Lead: 0Vdc
3. Yellow Lead: Not connected
4. Blue Lead: V supply if not using as enable switch
B: Linear Modulation Control Function
To linearly modulate the laser, any modulation signal up to 700kHz (dependant on diode) with
an amplitude of 0V to +1Vdc can be applied to the yellow lead.
1. Red Lead: +8Vdc ±500mV
2. Black Lead: 0Vdc
3. Yellow Lead: input modulation signal 0 to +1Vdc amplitude
4. Blue Lead: V supply if not using as enable switch
C. Setting Power Via a Voltage
Alternatively the yellow lead can be used for a linear power control function. In this situation,
the laser power is denoted by a voltage applied to the yellow Lead, 0V turning the laser off and
+1Vdc giving maximum power, with linear trend between. See linear intensity graph .
1. Red Lead: +8Vdc ±500mV
2. Black Lead: 0Vdc
3. Yellow Lead: input control voltage (0 to +1Vdc)
4. Blue Lead: V supply if not using as enable switch
0.0
0.2
0.4
0.6
0.8
1.0
0
20
5
40
60
80
100
Control Voltage (Vdc)
Output P
ow
er (%)
D) Setting the Output Power Via a Resistor
The control wire has a 10k Ohm input impedance
connected to an internal 1V source which is used as
the reference for the factory set power. Measuring
the voltage between the Yellow and Black wires with
a high (>10M Ohm) impedance voltmeter, will give a
reading of 1 V ± 2%. Connecting a 10k Ohm resistance
between the Yellow and Black wires will result in the
reading falling to 0.5V and the light output falling to
half the factory set power. Other outputs between 0
and the factory set power can be achieved with a single resistor Rx by using the formula:
Where Po is the required power output
as Pfs is the factory set power
RX = Po* 10K
PFs - Po
