Create an Account  |   Log In

View All »Matching Part Numbers

Your Shopping Cart is Empty

Fast-Steering Mirrors

Fast-Steering Mirrors

Clear ApertureØ20 mm
Mirror Flatness (@ 632 nm)λ/4
Wavelength Range450 nm - 20 µm
Damage Threshold>10 W/cm2
Pointing Accuracy1 mrad
Repeatability<1 mrad
Max Mechanical Scan Angle±12.0° x ±12.0°
Communication ModesUART (19,200 Baud) SPI
Operating Temp Range0 to 40°
Housing Dimensions (W x H x D)1.20" x 1.20" x 1.75"
(30.5 x 30.5 x 44.5 mm)
  • This product is still under development, and its final specifications are subject to change.


  • 2-Axis Steering (Pitch and Yaw)
  • >±24.0° Optical Angular Range
  • Compact Mirror Housing
  • Enables Easy Design of Optical Scanning Systems
  • Calibrated Linear Response
  • Digital Closed-Loop PID Feedback
  • Software and Hardware Triggering Capabilities
  • Designed for OEM and Research Applications

The FSM20XY Fast-Steering Mirror is a customer-inspired, high-performance 2D steering mirror designed to be integrated into custom-built systems. With an optical angular scan range in excess of ±24.0° and a clear aperture of Ø20 mm, the mirror is ideal for a variety of applications including general-purpose beam steering, auto-alignment systems, remote beam control, and image capture. Each mirror is calibrated so that the position of the mirror relative to the flat face of the mirror housing can be commanded by an SPI or UART electrical interface and software command set.

The FSM20XY mirror has a protected silver coating on a polished metal substrate, which offers a reflectance in excess of 96% throughout the 450 nm to 20 μm wavelength range. The mirror is supported by a frictionless flexure bearing support frame and is actuated using four voice coil actuators.

The compact mirror head includes four threaded holes for mounting. The included controller is built on a printed circuit board, which can be easily integrated into OEM applications. The OEM circuit board needs an external power supply that can provide +15 VDC at 3 A, -15 VDC at 3 A, and +7 VDC at 1.5 A. An optional enclosure with integrated power supply is also available for standalone and laboratory use of the FSM20XY.

Control of the fast-steering mirror is accomplished with the included digital Proportional Integral Derivative (PID) controller. From the initiation of the move command to the mirror settling at the final position, the fast-steering mirror can steer a beam through an angle of 48° in less than 60 ms. For a smaller 10° move, the settling time is less than 15 ms. For the fastest point-to-point execution times, the move or move sequence can be programmed into the 400 point FIFO queue in the controller. In addition, the trajectory profile and settling band can be custom tailored to meet the needs of a specific application or sequence of moves.

The position of the mirror is optically encoded using a position sensor that provides feedback to the PID control circuit. As a result, the mirror can be positioned with an accuracy of 1 mrad and repeatedly returned to the same position with an accuracy better than 1 mrad.

Since the mirror steers the beam in both the X and Y directions, pincushion distortion is minimized when compared to galvo-based scanning approaches. XY steering mirrors are also easy to incorporate into 2D scanning and imaging systems, since the mirror can be precisely positioned in a pupil plane.

For more information concerning pricing and availability, please email

Thorlabs Fast-Steering Mirror Drawing

There are no available Support Documents.

Please Give Us Your Feedback
Email Feedback On
Contact Me:
Your email address will NOT be displayed.
Please type the following key into the field to submit this form:
Click Hereif you can not read the security code.
This code is to prevent automated spamming of our site
Thank you for your understanding.
Would this product be useful to you?   Little Use  1234Very Useful

Enter Comments Below:
Characters remaining8000   
Posted Comments:
No Comments Posted
Log In  |   My Account  |   Contact Us  |   Careers  |   Privacy Policy  |   Home  |   FAQ  |   Site Index
Regional Websites: West Coast US | Europe | Asia | China | Japan
Copyright 1999-2015 Thorlabs, Inc.
Sales: 1-973-579-7227
Technical Support: 1-973-300-3000

High Quality Thorlabs Logo 1000px:Save this Image