Abstract: A system for communication is provided. The system includes an emitter transmitting a first code of a first wavelength. The system includes a filter or variable waveplate receiving the first code. The system includes a receiver sensor receiving the filtered first code. The system includes the emitter transmitting a second code of a second wavelength. The system includes the variable waveplate or other filter receiving the second signal. The system includes the receiver sensor receiving the filtered second code. The first and second codes may be used for communication, synchronizing the emitter, and other purposes.

Abstract: A Lidar system is provided. The Lidar system includes a laser emitter transmitting a first signal of a first wavelength. The Lidar system includes a filter receiving the first signal. The Lidar system includes a first dichroic filter switch filtering the first signal received by the variable waveplate or other filter. The Lidar system includes a receiver sensor receiving the filtered first signal. The Lidar system includes the laser emitter transmitting a second signal of a second wavelength. The Lidar system includes the variable waveplate or other filter receiving the second signal. The Lidar system includes the first dichroic filter switch filtering the second signal. The Lidar system includes the receiver sensor receiving the filtered second signal. A processor determines a distance of a target based on the received filtered first and second signals.

Abstract: A system for communication is provided. The system includes an emitter transmitting a first code of a first wavelength. The system includes a filter or variable waveplate receiving the first code. The system includes a receiver sensor receiving the filtered first code. The system includes the emitter transmitting a second code of a second wavelength. The system includes the variable waveplate or other filter receiving the second signal. The system includes the receiver sensor receiving the filtered second code. The first and second codes may be used for communication, synchronizing the emitter, and other purposes.

Abstract: Methods and systems for correcting chromatic aberrations in a telescope incorporating a diffractive primary optical element are provided. In particular, a corrective optic assembly that includes a corrector diffractive optical element (DOE) is described. The corrective optic assembly provides light to the corrector DOE at a high incidence angle. Moreover, light is reflected from the corrector DOE at a high exit angle comprising a cylindrical Littrow configuration allowing for greater bandwidth and smaller size.