Laser communication is considered a key enabler for future high data communications between satellites, aerial vehicles, and ground stations. For successful laser communication over several thousands of kilometers distance, pointing of the laser beam between the transmitter and the receiver needs to be controlled with a precision down to a few microradians.
The FSM product is specially designed for laser communication to enable this level of precision pointing.
Technology developed by DEMCON with TNO
High compensation bandwidth with fast dynamical response
Specifically developed electromagnetic actuator
Enables high efficiency in terms of volume and unit power
Flexural bearing yielding high linearity and no wear
Customized mirrors up to 30 mm diameter possible.
Standard 20mm mirror with flatness < 12nm RMS
>95% reflection over broad wavelength range
Optional: Angular feedback control by utilizing angular displacement sensors to measure and control the mirror angle with high accuracy
Scalable to different sizes
How it works
Within a laser communication terminal, a tracking sensor controls the pointing. The sensor measures the incoming angle of the received light from the partnering terminal. Based on these readings, a Coarse Pointing Assembly (CPA) together with the FSM correct high-frequency misalignments. In addition, a second FSM provides information on the Point Ahead Angle (PAA), enabling the laser communication terminal to compensate for the “time of flight” – or the time it takes for the laser beam to arrive at the receiving end.
The FSM is a versatile product. Although in its essence a fast-tip tilt mirror, it can also be used in other applications.
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