A system may include a laser source, and an AOM coupled to the laser source. The AOM may include an acousto-optic medium, and transducer electrodes carried by the acousto-optic medium. The system may also include an interface board having a dielectric layer, and vertically extending signal vias within the dielectric layer. Each vertically extending signal via may have a lower end in contact with a respective transducer electrode. The interface board may have laterally extending signal traces carried by the dielectric layer. Each laterally extending signal trace may be in contact with an upper end of a respective vertically extending signal via.