Raman Spectroscopy is used to identify a material by detecting its molecular vibrational and rotational modes. A laser light is shined onto the material and the scattered light is used in the spectroscopy measurements. Since the excitation source laser intensity is often six to eight orders of magnitude greater than the Raman scattered signal, edge pass filters are required to block the wavelength of the scattered laser beam while transmitting the wavelength shifted Raman scattered signal.
PIXELTEQ micro-patterned optical coatings combine patented microlithography expertise with state-of-the-art coating technology. These micro-patterned filters help create compact and cost-effective optical devices for use in biomedical, security and defense, aerospace, precision agriculture and machine vision applications.
Over the past decade, continued improvements in multi-layer thin film filter (TFF) design and manufacturing methods — such as in-situ optical monitoring and automated coater control with dynamic design adjustment — have enabled successful production of optical filters with increasing control over the spectral shape. This has facilitated the production of more complex filters, including multi-band spectral performance. Improvements in coater uniformity and machine operation efficiency achieved through quick-turn load-locked systems have reduced filter manufacturing costs, even as the complexity of filters has increased. This reduction in price, coupled with improvements in performance, has enabled new applications using these TFFs and closed the consumer gap.
Fundamental to most Raman microscopy applications is the desire to access as much of the Raman fingerprint of the molecule of interest as possible, requiring filters that provide “more signal with less background.” In order to optimize the capture of this very-low wave number Raman signal, a premium is put on edge pass filters with extreme steepness, very precise edge wavelength control, and deep blocking of the excitation laser. This article provides an in-depth discussion of optical filters for Raman analysis, addressing filters for both bench-top and portable Raman applications.
DELTA Light & Optics, http://www.filters.madebydelta.com, has opened an office in North America to support their expanding customer base for linear variable filters and advanced optical filters and components.
Deposition Sciences, Inc. (DSI), manufacturer of highly durable optical thin film coatings, announces an expansion of its sophisticated optical components line, the new Multispectral Optical Filter Assemblies.
Optical filters play a key part in providing wavelength selections in earth-observation systems, but they provide a unique challenge in space-based applications. At Photonics West 2017, Jason Palidwar with Iridian Spectral talked to us about some of those challenges, and how his organization has addressed them.
Jason Palidwar with Iridian Spectral Technologies spent some time with us on the last day of SPIE’s 2016 DCS exhibition to talk about the challenges encountered in the mid-wave spectrum and how his company has worked around them.
Jason Palidwar of Iridian Spectral kicked off our DSS exhibition coverage by giving us a closer look at what they’re showcasing this year.
Iridian Spectral has been busy expanding its product offerings, and Hongbai Lao was kind enough to show us what the company was featuring at the show.