SILL Optics Now Sells Large Aperture F-theta Lens for High Power Lasers

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The new high-power F-theta lens can handle multi-kilowatt high power lasers and reduces thermal shift within the lens.

SILL Optics now offers an F-theta lens, the model S4LFT2500/328, which can handle multi- kilowatt high power lasers. This is the first 30mm aperture high power lens made of fused silica with low absorption anti reflection coatings to dramatically reduce internal absorption in the bulk material and coating. This minimizes thermal shift within the lens, which can lead to changes in spot size and energy density, ultimately causing unstable process conditions.

“We have developed a great deal of experience over the last several years in designing a lens that will maintain high performance as laser powers increase to very high levels,” says Gunter Toesko, SILL Optics.

The S4LFT2500/328 has a focal length of 500mm, optimized for 1064nm (but usable from 1030nm to 1090nm). The lens delivers a maximum scan field size of 280 x 280mm and can accommodate up to a 30mm input beam diameter. The larger beam diameter decreases the energy density on the scan mirror system. The performance of the lens is well suited to imaging single mode fiber and disc lasers with Gaussian intensity profiles of M2= 1.X.

Sill Optics and Couriertronics will exhibit at Photonics West on Feb 2-7, 2013 at The Moscone Center in San Francisco, California. They will be located at Booth 1741. Items on display will include F theta lenses, beam expanders, and telecentric imaging lenses.

“We will have the laser optics designers at our booth at Photonics West. This is an excellent opportunity to discuss your application in detail,” says Chris Dehnert, Couriertronics.

For more information call 518-279-9500 or visit or

About Couriertronics
Couriertronics distributes high performance laser optics and machine vision products in North America. We offer a variety of standard products in addition to custom designed:

  •     radiation hardened lenses
  •     color corrected laser f Theta scan lenses
  •     zoom beam expanders
  •     telecentric lenses for sensors up to 160mm
  •     zoom telecentric lens
  •     CCD & CMOS linescan, TDI and area cameras
  •     optical domes
  •     IR Cameras and Process Control

Founded in 1988, the Couriertronics team has over 60 years of combined experience in providing solutions and engineering support on technical applications.

For additional information:
Christian Dehnert
315 Carrolls Grove Rd
Troy, NY 12180
Cdehnert (at) couriertronics (dot) com

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Christian Dehnert
(518) 279-9500
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