Iridian Articles

  1. Remote Sensing With LiDAR Requires Optical Filter Trade-Offs

    Engineers and designers working on LiDAR applications should consider critical filter issues early on.

  2. Specifying Surface Figure And Wavefront Distortion For Multi-layer Optical Filters

    Optical filters are used in many applications and the surface figure and wavefront distortion requirements of filters are dependent on where and how they are used. If filters are only used in sensing applications with very tolerant detector geometries, there may be no need, in practice, to put any constraints on the surface figure or wavefront distortion. This white paper helps the reader understand where, when, how, and how much to specify wavefront distortion to ensure that functional requirements of filters are guaranteed while unnecessary and costly constraints are avoided.

  3. LiDAR And Optical Filters – Helping Autonomous Vehicles See More Clearly

    “What’s a ‘steering wheel’?”  At the present time this would be a very strange question to hear asked from anyone who has driven, ridden in, or even seen a car but in a couple of decades this may not seem so unusual.  The evolution of increasingly affordable and capable sensing and imaging systems combined with the desire to create safer, more efficient transportation systems is driving the development of autonomous vehicles (pun intended).  LiDAR is a key technology that will eventually help carry this growth through to “Level 5” autonomy --> no steering wheels, no brake pedals, no human intervention in driving.

  4. The Right Filter Is Key To Lower-Cost And Faster Time-To-Market MWIR Equipment

    Midwave (MWIR) infrared light is important in many hardware applications and optical filters are critical to success. Some simple practices can help avoid over specifying filter characteristics and driving up costs.

  5. How To Specify A Filter

    In general, typical filter optical specifications will include the wavelength ranges over which to reflect and transmit light, clear aperture of the filter, the polarization state of light for non-normal angles of incidence, light coherency (laser or white light), optical beam size and cone angle of light, and more. 

  6. Optical Interconnects For Data Centers — Lighting The Cloud

    The demand for storage and data transfer capacity has increased dramatically over the last decade. The need to constantly access and transfer data to and from, as well as within, data centers has placed a huge load on the interconnects connecting the backplanes of data servers. 

  7. Frequently Asked Questions: Optical Thin Film Filters

    This article answers an array of frequently asked questions about optical thin film filters. It provides in-depth information on what they are, how they are created, how they perform, and what to look for when selecting an optical thin film filter supplier.

  8. The Eyes Of The Instruments: Using Optical Filters To Observe And Measure Earth From A Different Perspective

    An improved ability to manage or understand the natural or influenced phenomena is critical to ensuring that we maintain a healthy planet capable of sustaining humanity as part of its diverse biomass. But understanding these phenomena and how they are changing over time requires measurement.

  9. 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.

  10. Large-Format, Narrow Band Pass Filters (NBPF) – A Uniformity Challenge

    Within so many diverse optical filtering applications, large-format (>100 mm diameter), narrow bandpass 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.