Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 3rd Semester (Third Semester) 2018-2019 Laser Systems And Applications Roe 033 Question Paper
Paperm=?-:h 1101111111 1 IT 1 1 IT J
B TECH
(SEM-lll) THEORY EXAMINATION 2018-19
LASER SYSTEMS AND APPLICATIONS
Time: 3 Hours Tom! Marks: 71)
Note: 1. Ancmpt all Sections. Ifrequirc any missing data; then choose sunably.
1__1
SECTION A
l Attempt all questions in brief. 2 x 7 = 14
a What do you understand by Fetmi Dirac D1stribulion function?
b. What is temporal coherence?
c A laser diode emits 1501100 pulses per second, The duration of each pulse is 30m. (Z?alculalc
Duty cycle.
(1 What '15 the drawback of Ruby 12561?
c. Enlist the difference between Kryplun ion laser and Argon ion iuwcr.
f. What are the losses associated in optical communication sysicms?
g W by pumping is necessary for 13501 acum"
SECTION 11 y
2. Attempt any three of the following: 7 11' 3 2' 21
a. What is black body radiation? ()n whal factors 11005 the black hudy rudialion depend upon?
1). What is optical c131 11y? Calculate: the loop gain with and 11ith11ul 11:11:11 1111 1111110111 c111111
c. Differentiate between continuous 1111110 111- .cr and 1311153. 121501 Dis'cuss' 131111115 p1115a11ng
technique for a laser. - .
d. W 11h suitable diagram explain cun:.'.1uc111?111 11nd Wurking 111 Ndi'?ass 121.10,
c. How laser useful in matenai p1'11cegsi11'g? D1scuss laser uumng and laser weiding p1 occgs
. SF! T?HUN (?
3. Attempt any one par!91"..th?folln11'1112: , 7 1 1 w 7'
(a) Explam B01111 11112013 111"E1\d1'11gc11 11111111. If 111 chumulmnsil [10111 $011111! 1111-111 311 1111' ?rst
011111. 111151th 11 ankngth Ofclccuon 1n "11111-11111 atom.
(lb) Explain 111C physical Siuni?cance 0111-3111 111111. 111111 ?4? 13-01112: lime :1111cp1?11dem
Schroedmger wa11; equation
4. Attempt any one part 1111111: [nllnwimtz 7 1' 1 = 7
(a) [Jiffcrcnumc b'clvu ecu sponxancom emission 31111.1 51111111131111 1111115111111. ?1'1113 1111111111 01 :1 111561
has a pulse dulminn 111031115 1111-11 1111-1135. ' 1?11?101 is 1112111 pt: pulsc HIM much 1:111:1g_\ 1.1
released per pulse and 11011 mam "11 1.110111: docs C111 h p11151:cor.tain ii IIIC 11111 elmgrh 1.1! :asc1
beam 11: 6000/51. .
(b) What 15 0-511 itched 1a
(21) Why [our level laser .1331th 15 more ef?cient than three levci laser syslcm'.? Find the 131111 01
population of two cnergy state .of [he Ruby laser the transition hcmccn which is responsible
ofphoton of wavelength 6928 A. Assume ambient temperature 15 13K.
(b) What are the main components of laser! Bric?y explam each component.
1|E?1=g?:
6. Attempt any one part of the following: 7 x l = 7
(a) With suitable schematic diagram explain the working of dye laser. How dye lasers are
tuned?
(b) Illustrate construction and working of excimer laser. Enlist Lhc applicaiwn 0f cxcimer
laser.
7. Attempt any one part of the following: 7 x l = 7
(a) How arc lasers useful 1n Ihu. ?eld of mcdicme?? Brie?y explain the application of
lasers in Ophthalmology and general surgery.
(b) Discuss the principle 01? holography, Explain construction and reconstruction of
hologram.
P_hjsical Constangs
Rest mass of?lecucn m.. ; 91/16) "' kg
Rcs?. mam ofproton mg: 1.67? 10'3" kg
Speed ol' light [I : 3 -' 10K in:-
Planks constant h 6563510? J-s
Charge on electron c " [QYWWL'
Bolwmum s Consianl k 1 38x 10?" WK
2 IT" a
This post was last modified on 29 January 2020