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e894a3i

# e894a3i - ENSC 460/894 Assignment 3(Mar 16 due Mar 23 2006...

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ENSC 460/894 Assignment 3: (Mar. 16 due Mar. 23 2006) 1. If the spot radius is 1.5 cm for a HeNe TEM 00 mode beam entering a lens of f=12.5 cm 3(a) Calculate the focused spot size.(3 marks) 3(b) Calculate the depth of focus to keep the spot size within 10% of the minimum value.(4 marks) 2 For a GaAs laser diode the laser emission area is 1 micron thick by 50 microns wide. Calculate the divergence angle in the vertical and horizontal direction. What is the Rayleigh range for each direction, (8 marks) 3 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) 4 Calculate the refractive index difference per centimetre in lithium niobate (LiNbO 3 ) for an applied filed of 1000 V/cm. How long must a longitudinal Pockels cell be to cuase a phase change of 90 o between the fast and slow rays for a ruby laser light ( λ =694.3 nm)?
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