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Posted: April 10th, 2024
For your maximum average output power, calculate the energy of each pulse, and so estimate the peak power during the laser pulse. (Hint: pulse energy is instantaneous power integrated over the pulse shape.) How does this compare to the peak power during CW operation?
1. Check that the Q-switcher is connected to the RF input of the impendence matching box, and
the TTL pulse from the pulse generator is connected to the video in BNC on the amplifier. The
amplifier is also connected to the DC power supply.
2. Turn on the pulse generator and set up to give TTL (5V) square pulses at a pulse repetition rate
of 30 kHz.
3. Turn on DC power supply to 20 V DC.
4. Check with photodiode for pulsed output, using the oscilloscope.
Question: Explain how the acousto optic Q-switch operates to give a "giant" pulse from a CW
pump laser.
5. Record the pulsewidth (FWHM), buildup time (time from the square trigger pulse to the start
of the laser pulse), and the average output power as a function of diode current (up to 750
mA). Plot these quantities as a function of pump power, and comment on the form each takes
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Question: What pulsewidth would you expect from the theory of part 3?
Question: For your maximum average output power, calculate the energy of each pulse, and
so estimate the peak power during the laser pulse. (Hint: pulse energy is instantaneous power
integrated over the pulse shape.) How does this compare to the peak power during CW
operation?
6. Change the repetition rate to 200 Hz, and look at the pulsed output on the photodiode, exploring
the full range of pump powers. At high pump powers, the laser does not work correctly – work
out what goes wrong and what causes the problem. Determine the highest pump power for
which the laser operates correctly at 200 Hz.
7. Confirm that the same problem does not occur at 10 kHz? Why not? You need to know that the
upper level lifetime (storage lifetime) of the laser material is
= 230 µs.
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8. Using the highest pump power determined in part 6 for correct operation at 200 Hz, measure
2
the average output power as a function of repetition rate, between 200 Hz and 30 kHz. Plot the
average output power, and the calculated pulse energy, as a function of repetition rate.
24/07/2018. 4
Question: Discuss why the average output power, and the calculated pulse energy behave in
this way. Consider how the time between pulses
affects the stored energy in the two cases:
low rep rate with
1. Turn off DC power supply for Q-switch by winding voltage down to zero.
2. Turn off TTL pulse generator.
3. Wind down diode current slowly to zero.
4. Turn off ON button on right of diode power supply.
5. Turn off key of diode power supply.
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