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Chapter 3
♦
Recess the laser diode inside a metal shielded enclosure, such as a Model 700C
laser diode mount, recessed at least ¼" with the minimum aperture necessary to
allow beam exit (less than 0.125").
♦
If industrial loads are switched in or near your laboratory, use isolation
transformers and/or surge suppresser power strip with your laser current source.
♦
Isolate your laser current driver with a surge suppresser when using a common
line with laboratory power supplies, soldering irons, or other electronic
instruments. Avoid using such devices on the same surge suppresser as your
laser source.
♦
Make sure the all cables to the laser diode are securely fastened. Avoid
"bundling" current source cables with other cables in your laboratory,
♦
Set current and voltage limits to appropriate levels, following the laser
manufacturer's recommendations (or to just above the expected operating
current). Suggestions include setting the compliance voltage no more than 10%
above V
current of the laser diode.
♦
Avoid ground loops. Don't ground the LDD cable shield to the laser diode body.
Added protection from electrostatic discharge (ESD) can be obtained by inserting
ferrite beads and capacitors near the laser diode as shown below.
LDD Connector
D-Sub 9
PD Anode
(pin 7)
LD Anode
(pin 8,9)
LD Cathode
(pin 4,5)
(pin 6)
PD Cathode
EGND
(pin 3)
Notes:
1.
When applying high speed modulation to the laser diode, this circuit may reduce
the maximum modulation frequency.
2.
The temperature controlled mount is earth grounded through pins 5 and 6 of the
TEC D-sub connector.
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Laser Diode Driver Module Operation
, and setting the current limit at or below the maximum operating
f
3.5 uH Ferrite Beads
Mouser P/N 542-FB73-287
.01 uF
.1 uF
.01 uF
Figure 13 - Laser Diode Protection Circuit
1
3
LD
PD
2
27
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