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Fast Steering Mirrors

Fast Steering Mirrors
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508 Phone: 1-800-222-6440 • Fax: 1-949-253-1680 O p t i c s TECHNICAL REFERENCE AND FUNDAMENTAL APPLICATIONS CYLINDRICAL AND SPHERICAL LENSES LENS SELECTION GUIDE SPECIALTY LENSES PRISMS MIRRORS OPTICAL SYSTEMS OPTICS SETS Fast Steering Mirrors FSM-300-01 Newport introduces the new FSM-300 Fast Steering Mirror. Our Fast Steering Mirror (FSM) product offering provides two-axis, high-bandwidth rotation with sub-microradian resolution. Newport offers standard designs that are economically viable for widespread commercial use for applications such as laser beam stabilization, laser scanning, laser pointing, tracking, and image stabilization. By utilizing a unique flexure design to confine the motion of the mirror, the bearing surfaces often used with galvanometer scanners are eliminated, along with their associated stiction and wear. This results in ultra-smooth motion, very high accuracy, and practically infinite lifetime. Four voice coil actuators provide fast, high-bandwidth rotation. Utilized in push-pull pairs, the actuators provide smooth, even torque to the mirror. An internal optical-based feedback loop is built into the FSM-300 head to provide position feedback with reference to the support frame for accurate and stable pointing, scanning, and tracking. When used in combination with Newport’s OBP Series Laser Beam Positioner, or a commercially available quad cell, an FSM can quickly lock to the detector for rapid laser beam control and stabilization. The controller/driver establishes the feedback interface between the angle sensors and the drivers, providing current to the voice coils that tip and tilt the mirror assembly. It also provides a convenient interface between the user and the mirror, allowing control voltages to be applied and mirror position to be monitored. The controller/driver contains the control circuits, current drivers, universal power supply, and user interface. The updated FSM-CD300 Series Controller incorporates upgraded firmware that allows for independent gain and DC offset adjustments of both X and Y-axes. This enhancement significantly improves the system performance for Laser Pointing applications such as Raster Scanning, requiring accurately controlled point-to-point movements. Fast Steering Mirrors offer a more compact package than dual XY galvometer scanners. They eliminate the need to displace the beam to accommodate a second galvo or to compensate for polarization rotation due to an extra reflection. With higher optical performance than galvo scanners, FSMs have larger apertures, lower wavefront distortion, and a broader choice of mirror substrates and coatings. The rotational axes of an FSM intersect at a single pivot point, unlike dual XY galvos, eliminating the displacement jitter. Newport offers a standard FSM-300 with a 1” (25.4mm) diameter mirror. A wide range of 1” mirror assemblies (mirror on carrier) for the FSM-300 are offered. This allows the user to field replace the standard mirror with another mirror that best fits the specific application. 1" mirror assemblies are sold separately. • Single pivot point for both X and Y rotation • Flexure suspension eliminates friction • Angular range ±3°, optical • Angular resolution 2 ìrad rms, optical • Fast closed-loop control, to 800 Hz • New field replaceable 1 in. mirror assemblies • Larger angular range than piezo-driven mirrors • Eliminates displacement jitter found in dual XY galvo mirror systems Applications • Laser Beam Stabilization • Laser Scanning • Laser Pointing • Tracking • Image Stabilization FSM-300 Mirror Assembly Rear View of Mirror Assembly Front panel of the FSM-300 controller/driver. Back view of the FSM-300 controller/driver.

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O p t i c s 509 Email: sales@newport.com • Web: newport.com TECHNICAL REFERENCE AND FUNDAMENTAL APPLICATIONS LENS SELECTION GUIDE SPHERICAL LENSES CYLINDRICAL AND SPECIALTY LENSES OPTICS SETS OPTICAL SYSTEMS MIRRORS PRISMS Typical Specifications Controller/Driver Command Input and Position Output Analog, ±10 V = ±26.2 mrad Peak Operating Power to Mirror 30 W Continuous Maximum Operating Power to Mirror 15 W Thermal Protection 60°C at mirror coil Current Protection 3 A Operating Temperature Range 0 to 50°C (32 to 122°F) Storage Temperature Range -20 to 55°C (-4 to 131°F) Power 100-240 Vac...

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––– FSM 300 Typical Safe Operating Area 100 10 1 0.1 0.01 0 40 50 150 250 350 450 550 650 750 850 950 Frequency (Hz) Command Amplitude (mrad) ––– FSM 300 ••••• 60 Degree Phrase Lag Typical Phase Response for Small-Angle Excitation 10 100 1000 10000 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 Frequency (Hz) Magnitude (dB) Typical Gain Response for Small-Angle Excitation ––– FSM 300 ••••• -3 dB Frequency (Hz) Magnitude (dB) 1 0 -1 -2 -3 -4 -5 -6 -7 -8 10 100 1000 10000 510 Phone: 1-800-222-6440 • Fax: 1-949-253-1680 O p t i c s TECHNICAL REFERENCE AND...

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511 Email: sales@newport.com • Web: newport.com O p t i c s TECHNICAL REFERENCE AND FUNDAMENTAL APPLICATIONS LENS SELECTION GUIDE SPHERICAL LENSES CYLINDRICAL AND SPECIALTY LENSES OPTICS SETS OPTICAL SYSTEMS MIRRORS PRISMS Spare Mirror Ordering Information Model (Metric) Description Material Description, Extended FSM-300-M-01 Spare Mirror Assy, FSM-300 Pyrex® AL.2 Coating, UV Enhanced Aluminum, 250-600nm FSM-300-M-02 Spare Mirror Assy., FSM-300 Pyrex® ER.1 Coating, Enhanced Aluminum, 450-700nm FSM-300-M-03 Spare Mirror Assy., FSM-300, Pyrex® ER.2 Coating, Protective Silver, 480-1100nm...

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Fast Steering Mirrors
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