Handbook of Biomedical Optics

522 Handbook of Biomedical Optics

e backscattered light collected at the front-focal plane and

within the NA of the innity-corrected objective lens returns

collimated and passes back through the quarter-wave plate

and relay telescope. Aer the backscattered light reects from

Scanner 2, the light is descanned from a two-dimensional scan

area to a one-dimensional scan line. In turn, the scan line is des-

canned by Scanner 1 to a single stationary point. e descanned

light reects from the PBS and the tube lens focuses the light

through a stationary pinhole to a point detector.

e scanners and relay telescopes add size and weight to t