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assignment1s

# assignment1s - Assignment 1 How many photonsfsec are in a...

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Unformatted text preview: Assignment 1 How many photonsfsec are in a continuous 10 Watt laser beam having wavelengths: a) blue light 514 nm an \n:t~c 5“”‘777JWQ x m _. ééﬁ‘x/ﬂ X3KM -* _.__,——/—T’ 5”,!qu .44} = 3.3110 T 8 How long does it take to raise the temperature of 1 liter of water by 10° C when it fully absorbs a 10 Watt laser beam? Assume that no heat is lost through the top, bottom or sides of the container. I J __ (0.007%)4 ’0 ‘.._--5-— -‘ C W - maoaw/ Ll :4,sz T - 9 W 3' qzyuﬂ (D : 4200M 3. Laser cooling refers to slowing or stopping a moving atom by directing a laser at it. The atom loses momentum whenever it absorbs an oncoming photon (7x. = 780 nm). Subsequently, the photon is reradiated in no preferred direction. a) Estimate the number of photons required to stop a rubidium atom initially m0ving at the speed of sound. _ 1—? a Waé’wt WWIZM : 8-? ﬁ/‘éqxw k7 X3X/0______ : was «’52; 1‘7 MW -59 WM" ”1.2:; 2 é 44%” If 8X“); :Ss‘xm‘Z‘s 1‘7““[4‘2‘ #WW=_J,T_ aw": ~5/000 85‘1” 3 b) How long does it take to stop one atom if it takes about 25 nsec before the excited atom reradiates the photon? ﬂaring EMA; : 57,000): 25W 1- LB M59": 0) What distance does the atom travel while the laser slows it down to a stop? '2 dz; ‘ W ‘3 “0+ + ice—i 7W -5 -‘Z,53‘{05_ {I-B‘ﬁ!" :— 300 Y {-3 2((0 T :2 0 1a m d) What laser power is required to stop an atomic beam having 1 billion atoms/sec? Ll .' BOW: ,0702‘99“. xb’iaoo aﬁioﬂ «0.9-1. 1' 3m596‘. 34/ 5’ _ {0‘1 x54090 x 4 44*” KBWO 4 '- .—_._._________.———‘-"'_'_-___'__ pint/0'} 445“" ”(Omw M M 5- 2. 2 g Z‘ a: FBOON/ﬂ-Eac :—z_3’>C/0 Pvt/M Estimate the time for light to travel from Toronto to Paris via a) an optical ﬁber under the ocean T Zia qmmﬂ—eézfookh. . .5 W 25 /Z§w=- éj‘xxo A computer disk is made by focusing light to a spot whose diameter is comparable to the optical wavelength. Find the number of bits that can be stored on a 10 cm diameter optical disk using a) an infrared laser 3‘ 2 {/a M 11422: Maj/a; 77g.) w 1*: I0 : l0 GBFJF b) an ultraviolet laser. ...
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