Unformatted text preview: 4 For a GaAs laser diode the laser emission area is 1 micron thick by 50 microns wide. Calculate the divergence angle in the vertical an horizontal direction. What is the Rayleigh range for each direction, (8 marks) 5 Assume a single layer antireflection coating is to be deposited on long IR ZnSe lens (n=2.4) for a wavelength of a CO 2 laser (10.4 microns). (a) What is the minimum thickness for this coating (3 marks) (b) What is the next smallest thickness that will give an AR coating. (2 marks)...
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- Spring '10
- Light-emitting diode, spot size, HeNe TEM00 mode