Photonic components are fueling impressive gains by Earth-based astrophysicists—with more to come in the soon-to-be-initiated age of extremely large telescopes.
IMAGE OF THE WEEK
Laser diode ruby laser
A gallium nitride (GaN) laser diode pumped ruby laser. The gap between the blue and red beams is the laser cavity. The beams are made visible by tracing them with a white card while the camera shutter is open.
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