Light beam steering

Figure 15.5 Schematic of instrumental apparatus. The DT/MH-functionalized AgFON was surgically implanted into a rat with an optical window and integrated into a conventional laboratory Raman spectroscopy system. The Raman spectroscopy system consists of a Ti sapphire laser (Acx = 785 nm), band-pass filter, beam-steering optics, collection optics, and a long-pass filterto reject Raleigh scattered light. All of the optics fit on a 4 ft x 10 ft optical table.

Figure4.8 shows the collecting telescopes configuration. Each consists of a pair of focal parabolas (primary Ml, secondary M2) used in a Cassegrain configuration, plus a fold flat used for coarse beam steering (M3). The design is based in NASA s SPIRIT proposal (Wilson et al. 2007). After the beam steering mirror the light is...

For the beam steering mirror, the emissivity is assumed to be constant in the FIRI band and is a user defined parameter. In this module the stray light component is also modelled and assumed to have an emissivity proportional to the telescope emissivity, Sstray = 0.2s,eh whctc fot this Situation Stei is a user defined parameter. 

Note that internal reflection is not only possible for the specific example of a glass-air interface, but also for all dielectric media boundaries for which the light passes from one medium into another medium where i > n2- Total internal reflection is exploited in the use of prisms for beam-steering applications (see below) and in optical fibres (see Chapter 12). 

Moreover, steering architectures may minimize losses. They provide programmable beam steering elements that can direct the incident light into the required outlets in real time. The performance of the system depends only on the beam steering elements. Microlens arrays have been used to improve... 

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