1. Consider the following optical system, in which a semiconductor laser beam (spectrally centered
round a wavelength of 1µm, but with a finite line width of 1nm) is expanded and then sent through the combination of a semi-transparent mirror (50%-50%) and 100% reflecting mirrors. How does the interference pattern of the beams look like? How does it change when the distance Dm1 between the mirrors is increased? What happens when the distance Dm2 is increased? Where should the lens be placed with respect to the laser diode to achieve a collimated expanded beam? What should be the diameter Db of the beam to avoid substantial diffraction over a length scale of 1cm?
1.interference pattern will be bright and dark fringes corresponding to constructive and... View the full answer