From-Scratch Alignment of a Q-Switched Nd:YAG Laser
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1 From-Scratch Alignment of a Q-Switched Nd:YAG Laser 1. Principles of a Q-Switched Laser 2. Cavity construction and choices 3. Alignment procedure 4. Results 1
2 Q-Switch Basics o Fast Q-switching o Slow excitation mechanism o Inherently pulsed o Giant Pulse very high intensity 2
3 Gain Medium o Nd:YAG is the textbook 4- level laser example o Solid state: broad energy band N3 o Slow N2 decay + Fast N1 decay: large inversion with long lifetime o Flashlamps used for excitation Insert picture from Milloni and Eberly here. (p.304 or p.415?) 3
4 Q-Switch o Pockels Cell & Polarizer λ / 4 o Cell: Voltage controlled waveplate o λ/4: End mirror? λ / 4 pol. pol. λ / 2 λ / 2 pol. pol. o o λ/2: Transparent to the cavity Optic axis must be aligned properly! 4
5 Resonator Choices ounstable Resonator design Low gain: build intensity from many passes High gain: few passes, fill medium with mode ototal reflector: convex odiffraction spot output coupler, flat mirror (?) 5
6 Alignment Methods o Pre-align the mirrors o Pre-adjust the pitch and yaw of the Pockels cell o First round of threshold and holdoff adjustments o Clean up output mode o Lather, Rinse, Repeat. 6
7 o HeNe: rough position for the mirrors. Pre-adjustment o Berry s black sandwich o Crossed polarizers across a birefringent crystal (the Pockels cell) o Yields orientation of optic axis of crystal Image taken from 7
8 First Threshold/Holdoff o Threshold: minimum lamp energy to see lasing o Holdoff: maximum lamp energy before Pockels cell leaks o The cavity must be aligned to the cell o and the cell must be aligned to the cavity. o Iterative alignment procedure: adjust the cell for both threshold and holdoff, then the cavity, then the repeat. 8
9 Output mode o Post-It Notes have many uses infrared will slightly burn the glue o Normal incidence on output coupler Poisson spot o Mode is important! o Improve the mode slightly, but be careful! o Holdoff extremely sensitive to mirror alignment; avoid large power output in breakthrough mode 9
10 Final Threshold/Holdoff arbitrary intensity units Sadly, I wasn t able to construct a least squares fit to the data as recorded. I did guess & check a Gaussian pulse till it looked like it fit; Each blue pulse has a FWHM of 3.22 ns. Verified as reflections from walls ns 10
11 Final Threshold/Holdoff arbitrary intensity units Sadly, I wasn t able to construct a least squares fit to the data as recorded. I did guess & check a Gaussian pulse till it looked like it fit; Each blue pulse has a FWHM of 3.22 ns. Verified as reflections from walls ns 11
12 Final Threshold/Holdoff arbitrary intensity units Sadly, I wasn t able to construct a least squares fit to the data as recorded. I did guess & check a Gaussian pulse till it looked like it fit; Each blue pulse has a FWHM of 3.22 ns. Verified as reflections from walls ns 12
13 Final Threshold/Holdoff arbitrary intensity units Sadly, I wasn t able to construct a least squares fit to the data as recorded. I did guess & check a Gaussian pulse till it looked like it fit; Each blue pulse has a FWHM of 3.22 ns. Verified as reflections from walls ns 13
14 Final Threshold/Holdoff arbitrary intensity units Sadly, I wasn t able to construct a least squares fit to the data as recorded. I did guess & check a Gaussian pulse till it looked like it fit; Each blue pulse has a FWHM of 3.22 ns. Verified as reflections from walls ns 14
15 Final Threshold/Holdoff arbitrary intensity units Sadly, I wasn t able to construct a least squares fit to the data as recorded. I did guess & check a Gaussian pulse till it looked like it fit; Each blue pulse has a FWHM of 3.22 ns. Verified as reflections from walls ns 15
16 References Lasers, Peter Milonni and Joseph Eberly, (Wiley, 1988). Introduction to Modern Optics, Grant R. Fowles, (Dover, 1989)
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