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What is the physical significance (importance) of free spectral range (δνr) of the resonator in real laser systems?
In color center laser, what are the active medium, host material, and laser wavelength? Illustrate the factor, on which laser wavelength depends?
How to lower down the laser threshold in Nd-glass laser and what we want to achieve (purpose/get) by lowering down it?
Where ND is neodymium.
For an optical resonator, what is the physical significance of the equation, n(ν)dν = 8π(ν3/c3) dν?
where ν stands for frequency, c for velocity of light, and Nd for neodymium.
Draw the level scheme (schematic) of the He-Ne laser system. Demonstrate it, why we use He in He-Ne laser system?
Where L stand for laser, He stand for Helium and Ne stand for Neon.
If the mirror separation d = 50 cm changes by 2 nm, what would be the change in relative frequency? If the laser frequency is νL = 4 x 1014s-1, what would be the value of ∆νL=?
Beamwidth (between first nulls) will be for an antenna at 3 MHz with directivity of 100
An optical fibre is made of glass with a refractive index of 1.55 and is clad
with another glass with a refractive index of 1.51. The fibre has a core
diameter of 50µm and is used at a light wavelength of 0.8 µm.
(a) What NA does the fibre have?
(b) What is the acceptance angle?
Consider a cavity consisting of two plane mirrors separated by a distance 60 cm in air.
Calculate the mode number corresponding to the wavelength λ=600 nm. Also
calculate the frequency spacing between the two longitudinal modes.
Consider a wavelength multiplexer made from
circulators and fiber Bragg gratings. Assume the
input optical power of each wavelength is through
24 is 1 mW. Let both the insertion loss and the
throughput loss of each FBG be 0.25 dB, and let the
insertion loss of a circulator be 0.6 dB. What is the
power level of each wavelength in through h4
emerging from the final circulator ?
