Download AKTU B-Tech 3rd Sem 2015-2016 EOE 033NOE Laser System And Applications Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 3rd Semester (Third Semester) 2015-2016 EOE 033NOE Laser System And Applications Question Paper

Printed Pages : 4 ' ?? I ? ? EOE033/ NOE033
(Following Paper ID and Roll No. to be ?lled in your
' AnswerBook) ?
Roll No.
B.TECH
(SEM. III) THEORY EXAMINATION, 2015?16
LASER SYSTEMANDAPPLICATIONS
[Time : 3 hours] , [MaximumMarks : 100]
Note : The Question Paper contain three Sections.
Section-A
Q.l Attempt all parts of the following.A11pa1?ts carry equal
marks. Write answer of each part in short. (2 x 10=20)
(a) What are modi?ed and unmodi?ed radiations?
(b) Explain normalized wave function.
(0) What do you mean by active medium?
(d) Discuss the process of stimulated emission of
? radiation.
(e) What do you understand by quality(Q) factor in
laser?
16300 . (1) P.T.O.

(f) Describe, how the process of ?hole burning? takes
place in the laser gain curve. .
(g) Mention the ?elds in which excimer lasers can be
used. ?
(h) How_is pumping done in solid stae lasers?
I (i) Deduce an expression for de?Broglie wavelength
of an electron.
(j ) What are the applications ofLIDAR?
. Section-B
Note: Attempt any five questions from this section of the
following: ? (10X5='50)
Q2. What are the failure of classical physics? Explain
Planck?s quantum theory.
Q3. Discuss the working of resonators in laser system.
Classify resonators and explain working of one of them ?
in detail.
Q4. What is pumping and discuss its various methods. Find
the intensity of a laser beam of 100mW power and having
a diameter of 1.3mm. Assume the intensity to be
uniform.
Q5. Deri ve the laser rate equation in three-level laser system?.
I63 00 (2) EOE033/ NOE033
Q6. What do you mean by short pulse generation? Explain
any one method to produce it in detail.
Q7. Describe the construction and working of He?Ne laser.
Q8. 'Explain the principle of holography and discuss its
applications.
Q9. Write short notes on-
?(a) Laser applications in ophthalmology.
(b) Laser in diagnostics
Section-C
Note:Allcmpt any two questions from this section.
(1 5 x 2=30)
Q10. (a) Derive time independent Schroedinger?s wave
equation for a free particle.
(b) Describe the applications of laser in optical
communication.
(c) Explain the construction and working of Ruby
laser. ' ' '
Qll.(a) What is de-Broglie hypothesis? Derive
. ' anexpression for de-Broglie wavelength of an
electron.
(b) Describe the principle of laser action?
16300 (3) 1' P.T.O.

(c)
Q12. (a)
(b)
(C)
I 6300
The ratio of population of the energy levels is
1.059x 10'?. F ind the wavelength of light emitted
' at 300K. -
Explain the functioning and charcteristics of
excimer lasers with appropriate diagram.
Discuss the applications of laser in material
processing. _
What are the processes of spontaneous and
stimulated emission of radiation?
__x.__
(4) EOE033/NOE033