Fast Steering Mirror


Fast Steering Mirrors (FSM) Overview 

ATA has been developing and delivering custom high performance Fast Steering Mirrors (FSMs) for ground-based, airborne and space-qualified applications for over ten years. Our FSMs are used to reduce jitter and provide pointing accuracy in Directed Energy Weapon (DEW) systems, long range Laser Communications (Laser Comm), and other optical imaging and scanning systems. ATA now offers a line of FSM products that can be delivered on a Firm Fixed Price (FFP) contract with a set delivery schedule and no Non-Recurring Engineering (NRE). For information on our most recent FSM success story click here.

FSM Features

ATA FSMs use metal (aluminum or beryllium) or silicon carbide substrates depending on the specific requirements of the application. We can provide mirrors with virtually any coating requirement from basic metal coatings to high reflectivity dielectric coatings designed for HEL applications. ATA FSMs provide high acceleration; >10,000 radians/sec2 for our 1”-2” class of FSM.  Our FSMs achieve very high bandwidth (> 1kHz optical or position, depending upon size) and provide extremely low jitter of <1 µrad. 
FSM Benefits 

ATA FSMs are competitively priced to reduce program costs. Our mechanism designs are scalable, which eliminates NRE. Different mirror substrates and coatings provide customers the flexibility to tailor their FSM to specific program requirements. High acceleration provides greater torque authority enabling high bandwidth and providing rapid scanning capability. High bandwidth enables accurate jitter rejection from base motion and atmospheric turbulence in tip/tilt. 

Please contact us with your specific needs and we will be glad to provide more information as well as cost and delivery times. 

  Fast Steering Mirrors
  1" FSM 5" FSM 12" FSM
  Product Datasheet Product Datasheet Product Datasheet
Mirror Size

1” Circular

  5” Circular

12” Circular

Mechanism Size

1.2” x 1.6” x 0.8”

 6.0” Ø x 5.0”

15” x 15” x 8”


0.2 lbs

 <8 lbs

60 lbs

Mirror Properties

Beryllium Mirror
32 nm RMS

Silicon Carbide Mirror
λ/20 RMS Flatness

Silicon Carbide Mirror
λ/20 RMS Flatness

Angular Travel

Up to ± 1 Degree

   ± 1 Degree

± 8 mrad


>5,000 radians/sec2

 >1,000 radians/sec2

>500 radians/sec2

(Open-Loop Crossover)

>2.0 kHz Optical
>1.0 kHz Position

 >1.5 kHz Optical
>1.0 kHz Position

800 Hz Optical
500 Hz Position

Reactionless No Optional Yes
(1-1,000 Hz)

<1 µrad

 <1 µrad <1 µrad
Accuracy <5 µrad/mrad <10 µrad/mrad <5 µrad/mrad
Controller Type

Digital (FPGA)

 Digital (FPGA)

Digital (FPGA)