B.TechSemester 32024-25Laser System And ApplicationsBOE312H

Laser System And Applications (BOE312H) - AKTU Question Paper 2024-25

B.Tech · Semester 3 · Free PDF Download

This is the official AKTU Laser System And Applications Previous Year Question Paper for B.Tech Semester 3, 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 3

Session:2024-25

University:AKTU / UPTU

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Questions Asked in 2024-25

Laser System And Applications (BOE312H) — complete question paper · 70 marks · 3 Hours

Section AAttempt all questions in brief. 2 x 07 = 14

a
Differentiate between ordinary light and laser light
b
Describe quality factor of resonator
c
Explain the role of metastabl e state in achieving population inversion
d
Discuss the advantages of three level lasers over two level lasers
e
Describe different methods of measuring short laser pulses
f
Explain the role of helium in He-Ne laser
g
Explain the advantages of eye su rgery using lasers over other kind of surgery

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

a
Explain Absorption, Spontane ous and stimulated emission with labelled diagram and derive the relation between Einstein Coefficient
b
Explain gain in laser. Obtai n the condition of threshold gain
c
Explain three level and four level lasers. Describe briefly their actions
d
Describe the construction and working of Carbon dioxide lase r
e
Explain in details about the Laser applications in optical Communication and medical field with examples

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

a
The coherence length for a non-lasting light is 2.954 * 10 -12 m and its wavelength is 5890 Å. Compute: (i) The number of oscillations corresponding to the coherence le ngth (ii) Coherence time (iii) T h e spectral width
b
Explain the concept of spatial and temporal coherence and sh ow that the directionality of laser beam is related to the spatial coherenc e property of laser light
a
Explain the principle, construction and working of Fabry-Per ot resonator
b
A gas laser is generating a laser beam of 4mW power. Calcula te the number of photons emitted by the laser. The wavelength of the e mitted radiation is 680 nm
a
Describe various methods of m ode locking for generation of short laser pulses. Discuss advantages and disadvantages of each method
b
Enumerate the types of lasers based on medium. Discuss their merits and demerits
a
Explain the construction and working of an excimer laser
b
Explain in brief the construction and working mechanism of R uby laser with proper labelled diagram
a
Describe the term metrology? Explain at least two applicatio ns of lasers in metrology
b
Discuss the principle of holography. Explain construction an d reconstruction of hologram

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.

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