2D AOD

How Nigg used AOM:

AOD (Gooch&Housego, model 45070-5-6.5DEG-633)

frequency detuning between $-50 \sim -90 \mathrm{MHz}$
Key addition
- Trap II is able to address individual ions in long string, equipped with AOD.
- Trap I used offset voltage to shuttle the desired ion into the tightly focussed addressed beam over a distance of $10 \mu\mathrm{m}$ within $40 \mu\mathrm{s}$. This is impractical for longer strings.

AOM	AOD
speed	large diameter, highly collimated beam
extinction ratio	lower $v_a$ for larger number of resovable spots thus shear mode (acoustic wave in the direction [110] in $\mathrm{TeO}_2$) is used

EOD (the EOD used is from Leysop Ltd., United Kingdom) used on $^{40}\mathrm{Ca}^+$ linear trap
- switching speed (~30$\mu\mathrm{s}$) is given by the time it takes to (dis)charge the deflector's electrodes, and is thus mainly determined by "the amount of current the high voltage amplifier used to drive the device can deliver" (I recognize it as a particular maximal current intensity?).
- deflection range is limited to $3\sim 5 \mathrm{rad/kV}$

deflection range $\Delta \phi = \lambda \Delta f/v_a$ -- $\Delta f$ ~ AO bandwidth; $v_a$ ~ acoustic wave velocity
- rf.vl. $\mathrm{RF:} f_0=70\mathrm{MHz}, \Delta f=40\mathrm{MHz}, \Delta \phi=47\mathrm{mrad}$
number of resovable spots $N = \frac{\pi}{4}\frac{D\Delta f}{v_a}$
switching speed: just acoustic transit time $\tau_a = D/v_a$.
- low enough to avoid motional heat during ion transport
- high enought to allow arbitrary addressing
focus position resolution , rf.vl. $3.79\mu \mathrm{m/MHz}$
1st order diffraction efficiency, rf.vl. At $633\mathrm{nm}$ for $0.7\mathrm{W}$ RF, plateau of $92%$ over $\pm 10\mathrm{MHz}$ around $f_0$ with a fall-off to $\sim 72%$ at the $\pm 20\mathrm{MHz}$ band edges.

$^{40}\mathrm{Ca}^+$
No AOD
AOM used in
- control the power and frequency of the lasers (double-pass) 397nm, 729nm, 854nm, 866nm, PC controlled.
- zero's mode for the 397nm laser beam to reach the ions for far detuned cooling
I'm sure neither AOD nor AOM are used as deflector
How addressing is conducted (By address it means turn on and off?)
- Fig. 3.6

AOBD-UV 3246 or 3283
- Both of them work on 355nm and have 1% insertion loss.
- The major difference between 3246 and 3283 is RF bandwidth, and thus scan angle. In order to cover a $40\mu\mathrm{m}$ range,
  - 3246: 4.9mrad ~ distance=8.2mm
  - 3283: 1.2mrad ~ distance=33mm
AOMC 350-6 6-channel AOM, $F_c=350\mathrm{MHz}$, TeO2

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