B.TechSemester 42024-25Laser System And ApplicationsBOE412

Laser System And Applications (BOE412) - AKTU Question Paper 2024-25

B.Tech · Semester 4 · Free PDF Download

This is the official AKTU Laser System And Applications Previous Year Question Paper for B.Tech Semester 4, academic session 2024-25. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech

Semester:Semester 4

Session:2024-25

University:AKTU / UPTU

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Questions Asked in 2024-25

Laser System And Applications (BOE412) — complete question paper · 70 marks · 3 Hours

Section AAttempt all questions in brief. 02 x 7 = 14

a
Differentiate between spontaneous and stimulated emission
b
What is a ‘metastable state’?
c
Is it possible to hav e a two-level laser system. Explain your answer
d
What is the principle of excimer lasers?
e
What is ‘photolithography’?
f
Explain ‘active medium’
g
Define Q-factor in laser

Section BAttempt any three of the following: 07 x 3 = 21

a
Establish relation between Einstein’s A and B coefficients
b
Explain what is population inversion and why is this necessa r y f o r l a s e r a c t i o n ? Describe plane parallel resonator
c
Most of the lasers are of four level. Why?
d
Describe construction an d working of He-Ne Laser
e
Give a description of laser applications in material process ing

Section CAttempt any one part of the following: 07 x 1 = 07

a
Describe laser properties “dir ectionality” and “brightness”
b
A laser beam emits light of wavelength 632.8 nm and has a power output of 5 mW. How many photons are emitted per second by this laser?
a
Evaluate minimum pump power to maintain population inversion in three level laser system
b
The half width of the gain prof ile of a laser material is about . What should be the maximum length of the cavity in order to have a s ingle longitudinal mode oscillation?
a
What are CW lasers? How are they different from pulsed laser s?
b
Discuss techniques of mode locking for short pulse generatio n
a
Explain construction and working of laser
b
Describe Nd:YAG laser with an energy level diagram
a
What is LIDAR? Discuss its major components and applications
b
Illustrate laser application in holography

Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.