Portable Optical Tweezers Kit
Chapter 5: Setup and Adjustment
Rev B, February 15, 2022
Page 45
The current range of the L658P040-S laser diode is 75 mA (typical) to 110 mA
(maximum). The actual output for a certain current depends on the diode at hand.
You have two options:
•
Set the current to approximately 80 mA and measure the output power with
a power meter. Adjust the voltage until you reach 40 mW of output power.
•
Set the operating current just below 100 mA. According to our test
measurements, this will result in an output power above 50 mW. The
advantage is a stronger optical trap, the downside is that operating a laser
diode above the specified output power may decrease its lifetime.
Settings of the Laser Diode Controller
More Settings for the Laser Diode Controller
12
So far, we have not seen a significantly increased failure rate with an operating current near
100 mA. However, we cannot guarantee that the diode reaches the typical lifetime when driven near
its current limit.
Summary of Contents for EDU-OT3
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