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Consider a collimated beam, that is R(z 0)utted into a lens and focused onto a photodetector as shown in Figure P.2. Note: Do not assume that d f |a) (5 points) What is the complex Gaussian beam parameter, qi, just before the lens in terms of diameter of the lens, D, and 2? b) (10 points) What is the ABCD law matrix that relates qu to q2 at the photodetector? c) (10 points) Using ABCD law matrix from part c, and determine the smallest spot size that is focused onto a photodetector with f# ED in terms of D, d, and f.

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Taussian Beam 2w。 The complex Gaussi an beam parmmeter 24 The mateticd 이, tied oavelesth AtB AB CD matrix is A B and The spot

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