Camera Sensor: WTF is the MTF?

August 23, 2023

One of Selene Development’s key product areas is custom lenses for specialist camera systems for applications ranging from autonomous vehicles to space to life science microscopy. The resolution of our lenses is usually defined by MTF and we design and build lenses to an MTF specification.  But the lens is…

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Image Relay Beam Expander

July 31, 2023

Surely virtually everyone who has worked with lasers has used a beam expander.  There are two basic types, as shown below (you can also use mirrors or prisms): Sometimes there is a special case when you want the expander to do two things: expand the beam and also provide a…

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The Lagrange Invariant Strikes Again!!

June 1, 2023

Imagine this.  You’ve been asked if you can optimize the design of an illuminator to improve the efficiency, that is, get more light on to a detector.   Increasingly higher power LEDs have been tried but to no avail.  Your immediate reaction is “ah, the Lagrange Invariant strikes again!!”  Much of…

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