Laser System And Applications (BOE412) - AKTU Question Paper 2025-26
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 2025-26. 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:2025-26
University:AKTU / UPTU
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Questions Asked in 2025-26
Laser System And Applications (BOE412) — extracted question text · 70 marks · 3 Hours
Section AAttempt all questions in brief. 02 x 7 = 14
- aDefine coherence. What is temporal coherence?
- bWhat is population inversion? Why is it necessary?
- cWhat is the principle of laser action?
- dWhat is excimer laser?
- eExplain any two medical applications of lasers
- fDifferentiate between spontaneous and stimulated emission
- gWhat are the different types of pumping methods?
Section BAttempt any three of the following: 07 x 3 = 21
- aDerive the relation between Einstein A and B coefficients
- bA laser emits light of wavelength 600 nm. Calculate:(i) Energy of one photon(ii) Number of photons emitted per second if power is 2 mW
- cDescribe different techniques used for measurement of laser pulses
- dDescribe the construction and working of ruby laser with diagram
- eDescribe holography and its applications using laser
Section CAttempt any one part of the following: 07 x 1 = 07
- aExplain longitudinal and transverse coherence. Derive an expression for coherence length
- bThe coherence length for a non-lasing light is 2.94x10-2 m and its wavelength is 5890. Calculate: (i) number of oscillations (ii) coherence time and spectral width
- aDiscuss two, three and four level pumping schemes with diagrams
- bDefine gain and derive the condition for threshold gain in lasers
- aDifferentiate between continuous wave (CW) and pulsed lasers with examples
- bDescribe the main components of a laser system with neat diagram
- aExplain Nd-YAG laser with its characteristics and applications
- bExplain the construction and working of He-Ne laser with energy level diagram
- aExplain the principle and applications of LIDAR
- bExplain various applications of lasers in medicine and surgery
Question text is extracted from the official AKTU question paper PDF above. Check the original PDF for equations, diagrams and complete wording. Extracted: 2026-08-23.
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