When you watch this video don’t forget to switch on the audio. This machine serves to introduce fast endless polarization changes. A rotating bulk-optic halfwave plate (bottom left, between collimators) is placed amidst 3 + 4 rotating fiberoptic quarterwave plates (right), which rotate at different, incommensurate speeds. The halfwave plate rotates at 1.2 times the speed of the electromotor (green). In the video the motor speed is continuously increased from an initial standstill until it reaches 402 Hz at the end of the video. With each physical halfwave plate rotation corresponding to 8π rad on the Poincaré sphere, the achieved halfwave plate rotation speed of 482 Hz (28920 turns per minute) corresponds to a polarization change speed of more than 12 krad/s. Due to the large halfwave plate speed the trajectories are mainly circles of all orientations and radii, especially difficult-to-track great circles. Our electrooptic polarization controller can track this scenario, endlessly, without any interruption, not even a very short one. Actually, it is so fast that we recently had to change motor and belt drive wheels for increased speed. Unfortunately we mounted high-speed ball bearings this time, which took out some „music“ compared to the video.
We are eager to compete in the discipline of endless polarization control quality, i.e., speed, accuracy and reliability, with any commercial or experimental optical polarization control system from other source. Please contact us.
Contact us also if you wish to buy an endless polarization control subsystem (or many) in the future.
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