A collimated beam of light is incident on a one dimensional rotational scanning

Question

A collimated beam of light is incident on a one dimensional rotational scanning mirror as shown in the figure below. We wish to maximize the attainable numerical aperture available from the objective lens while scanning the focused beam across the sample. Design a lens configuration between the scanning mirror and the objective, and draw in the approximate optical path followed by the undeviated beam path, and the maximum deviation path. Note that the clear aperture of the objective is fixed at 9mm, and is approximately equal to the beam diameter. The focal length of the objective lens is 20mm. Additional lenses inserted between the rotating mirror and the objective may have a larger diameter, up to 50mm in diameter. What is the maximum linear scan dimension on the sample?

Explanation / Answer

approximate optical path =   from scanning mirror to objective lens to numerical aperture

                                         = 8.5 mm

maximum deviation path =    from scanning mirror to numerical aperture to objective lens

                                         =    7.1 mm

maximum linear scan dimension = 9 * 20/50

                                                    =    3.6 mm

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.