Newton, NJ - January 31, 2014 - Thorlabs announced today the acquisition of the Terahertz Optical Filter product line from Lake Shore Cryotronics, Inc. Over the past five years, through a combination of organic growth initiatives and acquisitions, Thorlabs has added optics, fiber, detectors, laser sources, and instrumentation to its product portfolio that support photonics applications and research in the mid-IR and THz spectral regions.
The new line of THz filters will be available from stock with center wavelengths from 27 to 500 µm (about 11 THz to 600 GHz) and clear apertures of Ø19.1 mm, Ø25.0 mm, or Ø33.1 mm. Made to withstand cryogenic temperatures, thermal cycling, high gamma radiation, vacuum pressure cycles, and vibration, each filter is designed with a cross-mesh pattern to reject unwanted out-of-band radiation due to reflection and destructive interference.
These filters incorporate metal mesh frequency-selective surfaces (FSS), which are comprised of thin metal films patterned with geometric holes. Based on the size and features of the pattern, the material will resonate with some frequencies and reject others. The patterns utilized in this new line of THz filters have been designed and simulated using FSS modeling software to provide improved performance over standard cross mesh patterns. The manufacturing of the gold mesh patterns is accomplished using thin film metal depositions and photolithography.
“The manufacturing method is compatible with our existing capabilities in precision-patterned-materials,” said Dave Beatson, General Manager of Thorlabs’ Quantum Electronics group in Jessup, MD. “We are excited about the rapid growth of these product lines, which include reticles, calibration targets, and various metal patterns on optical components.”