Mechanical shutter shapes laser beam

Jan. 12, 2006
To get the most out of a laser, whether for communications or measurements, it must often be shaped or sliced into small sections.

One reliable and inexpensive method of doing this is to use a electromechanical shutter, such as those designed and built by nmLaser Products, Sunnyvale, Calif. (nmlaser.com). They rely on an optically coated flexure beam to cover the window and prevent the laser beam from shining through. Energizing the toroidal electromagnet, however, makes it pull the cantilevered beam down, letting 100% of the laser beam pass through. If there is a power failure, the beam returns to the closed position. Beam stresses are so low, the beam's spring life is nearly infinite, according to the company. Simple dc drive circuits or more-sophisticated waveform controllers can control the magnet.

The shutter can modulate at up to 500 Hz and create lasers pulses as short as 800 sec. The design uses few moving parts, so there are no friction pivots, lubricated bearings, or linkages. It is also better suited to high optical power applications than high-speed performance, and it also has a high damage threshold.

Sponsored Recommendations

Sept. 16, 2025
From robotic arms to high-speed conveyors, accuracy matters. Discover how encoders transform motor control by turning motion into real-time datadelivering tighter speed control...
Sept. 16, 2025
Keep high-torque gearboxes running efficiently with external lubrication and cooling systems delivered fast. Flexible configurations, sensor-ready monitoring, and stocked options...
Sept. 16, 2025
Now assembled in the U.S., compact P2.e planetary gear units combine maximum torque, thermal efficiency, and flexible configurations for heavy-duty applicationsavailable faster...
Aug. 22, 2025
Discover how to meet growing customer demands for custom products without overextending your engineering team. Learn how scaling your automation strategy can help you win more...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!