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Posted: April 25th, 2023
Effect of laser diode current and temperature on Nd:YAG output power
PART 1 CW operation
Effect of laser diode current and temperature on Nd:YAG output power.
1. Turn ON key to turn on diode power supply.
2. Press ON button at right of power supply.
3. Put on safety glasses and wait for setup indicator LED to stop flashing.
4. Investigate the items the power supply can display, including current limit, average current and
temperature value and set point.
January 2009
fibre
diode
GRIN
heatsink
NdYAG
QS
impedance
matching
adjustable
mount
RF
out
diode power
supply
1.06 m
output mirror
video
in
RF oscillator
and amplifier
Figure 1. Setup of diode-pumped NdYAG laser.
DC power
+ 20 V
TTL pulse
generator
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5. Using the centre BIAS LEVEL knob and watching the average current display, slowly dial to
700 mA and check that the actual temperature settles to 23 C (20 C on cold days).
6. Check the NdYAG laser is operating with a phosphor card and measure its output power.
7. Record the laser output power for diode currents in the range 300 mA to 750 mA. (Check
temperature is constant). Plot the Nd:YAG output power vs optical diode pump power,
(USE THE DIODE CURRENT-to-POWER GRAPH SUPPLIED below) and determine the
threshold power and slope efficiency.
8. Record the laser threshold pump power for a range of diode temperatures from 11C to 23C.
Note error bars in readings. Why does the NdYAG output power depend on diode
temperature?
9. View the CW laser output on the photodiode and oscilloscope (50 Ohm load is fine). Note
the signal level and temporal characteristics. Calculate a rough calibration factor for the
measured power and photodiode output.
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