Using Optical Filters To Observe And Measure Earth From A Different Perspective

The view from outside often provides unique insights into an environment, as it can be extraordinarily difficult to objectively observe a system from within. Optical filters of different designs and formats are key contributors to the solutions for challenges within observations from orbit through photonics-based EO instruments, serving as “the eyes of the instruments.”

Clear The Air: Optical Filters For Sensors And Detectors

Environmental air quality, proximity control, crowd counting, climate change, the “Internet of Things”:  Our world has become an increasingly monitored place where the proliferation of sensors and detectors allows us, and our devices, to better understand and interact with our environments.  

Enhancing Endoscopy With Optical Filters

Endoscopic examination is a key technique used to diagnose early-stage neoplastic lesions associated with stomach and other gastrointestinal cancers. While white-light reflectance imaging has become the standard for in vivo diagnosis using “conventional endoscopy,” this article details three alternatives that leverage the wavelength selectivity provided by optical filters: narrow-band imaging, auto-fluorescence imaging, and endoscopic Raman spectroscopy.

Large-Format, Narrow-Band Pass Filters (NBPF): A Uniformity Challenge

Within so many diverse optical filtering applications, large-format (>100 mm diameter), narrow band pass filters (NBPF) are required to be used alongside large collection optics in order to facilitate specific and selective analysis of a phenomena or the substance of interest.

Understanding Edge Filters For Raman Spectroscopy

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.