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Friday, January 7, 2022

Download "Physics - Optics and Laser-II " Question Paper PDF of B.Sc. 4th Semester Previous Years Paper for Students.




B.Sc. (General) 4th Semester
Physics
Paper - B: Optics and Laser-II 




Time Allowed: Three Hours

Maximum Marks: 22 

Note: - Attempt two questions from Section I, two questions from Section II, and six parts of the question in Section III. Only non-programmable calculators are allowed to be used.


SECTION-I 

1. (a) Explain stimulated emission, spontaneous emission, and induced absorption. Derive the relation between Einstein's spontaneous and stimulated emission coefficients.

(b) What are the main features of Laser Light?


II. (a) What do you mean by broadening of spectral lines? Derive an expression for Doppler Broadening. 

(b) Find the Doppler Broadening for 6328Ao laser transition in He-Ne Laser, assuming a single isotope of Ne20 and that the Laser operates at a temperature of 373 K.


III. (a) What is population inversion? Why is it essential and how is it achieved in a Laser? 

(b) Explain the elementary theory of optical cavity.



SECTION-II 

IV. (a) Discuss construction and working of Ruby Laser.

(b) What are the applications of Lasers? 


V. (a) Discuss construction and working of CO2, Laser with a neat labeled diagram. 

(b) Find the possible frequency spread when the transition takes place from the unstable upper state having a lifetime of 10-8 s.


VI. (a) What is Holography? Describe recording of a hologram and reconstruction of the image. How holography is different from ordinary photography? 

(b) What are sources of attenuation of the signal in optical fibers?



SECTION-III 


VII. Attempt any six parts :


(i) Distinguish between LASER and MASER. 


(ii) How does Laser light differ from the light from a filament lamp? 


(iii) Can we obtain light amplification in absence of stimulated emission? 


(iv) Define temporal coherence and spatial coherence. 


(v) Do you think energy conservation is violated in Laser? 


(vi) Define coherence time. (vii) What is Laser pumping?


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