e894as2j - ENSC 460894 Assignment 2: (Feb. 21 due Feb. 29...

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Unformatted text preview: ENSC 460894 Assignment 2: (Feb. 21 due Feb. 29 2008) “— I For a Heler laser calculate the ratio of the spontaneous radiation coefficient to the stimulated coefficient (HCNC wavelength IS 632.8 nm). (5 marks) 2 Assume a single layer amireflection coating is to be deposited on long 1R ZnSe lens (11:2.4) For a wavelength ofa (‘0; 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) . A a Mix-11mm thickness t .- _‘?. a: .L g 10-5 um 31: = 3(1 71 um) - this c n- _ o -—' .um 6 no... -— “er—mu 2% = L55 _ . l _ 3 Given an Argon Ion laser running its main green line, with a be—am radius of 1 mm design a beam expenider to expand the beam radius to 5 m 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) Calculate Lhe Q value for a C02 laser (wavelength 10.6 microns) with a 2 m cavity and mirror —-— - 5 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 phoion in a laser with minor reflectances of 100% for (he back mirror and 40% for the from mirror? (2 marks) 1(b) If the optical cavity lenth is 1.5 m. with is the cavity lifetime? (3 marks) lilik'f 6 US Homeland security is worried that pilots may be blinded by people point laser points at distant airplanes. The .. most powerful laser pointer on the market is the BigHa pointer which has a 5 111W beam at 533 nm with w=1 mm. . (a)What is the Rayleigh Range of the pointer? ' (b) What is distance where the beam average power density has reduced to 0.531me: . (c) If an airplane is 1 km from the pointer, what is the spotsize at the plane, its average power density and peak power density? ' 7' Calculate the approximate peak wavelengths from expected from the following materials given their _. bandgaps: GaAs (1.44 eV), GaP (2.26 eV) CdTe (1.50 eV), In? (1.35 ev), SiC (3.00 eV) ...
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This note was uploaded on 11/22/2010 for the course ENSC 470 taught by Professor Chapmann during the Spring '10 term at Simon Fraser.

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e894as2j - ENSC 460894 Assignment 2: (Feb. 21 due Feb. 29...

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