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Unformatted text preview: 3 Given an Argon Ion laser running its main green line, with a beam radius of 1 mm design a beam expander to expand the beam radius to 5 mm using a main lens of f = 30 cm. Do both Galilean and Keplerian expander and draw the design. State what f input lens is required and the length of the system (5 marks each) 4 Calculate the Q value for a CO 2 laser (wavelength 10.6 microns) with a 2 m cavity and mirror reflectances of 100% for the rear and 40% for the output window. (5 marks) 5(a) What is the average number of round trips for a photon in a laser with mirror reflectances of 100% for the back mirror and 40% for the front mirror? (2 marks) (b) If the optical cavity length is 1.5 m, with is the cavity lifetime? (2 marks)...
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- Spring '10