Stimulated Raman scattering may have an optical power threshold of may be three orders of magnitude ___________

Stimulated Raman scattering may have an optical power threshold of may be three orders of magnitude . . . . . . . .

A

Lower than Brillouin threshold

B

Higher than Brillouin threshold

C

Same as Brillouin threshold

D

Higher than Rayleigh threshold

Indian physicist CV Raman was the first Indian to win the Nobel Prize in Physics in the year 1930 for his discovery of the Raman Effect, which is the scattering of light in different substances. Which of the following is NOT in line with the given statement? I: Physicist CV Raman was the first-ever Indian to win a Nobel Prize. II: In the year 1930, CV Raman discovered the Raman Effect.

A

Only I

B

Only II

C

Either I or II

D

None of the above

E

Both I and II

0.4 dB/km, 1.4μm, 6μm, 550MHz. Find threshold optical power for stimulated Raman scattering.

A

1.98 W

B

1.20 W

C

1.18 W

D

0.96 W

A single-mode optical fiber has an attenuation of 0.3dB/km when operating at wavelength of 1.1μm. The fiber core diameter is 4μm and bandwidth is 500 MHz. Find threshold optical power for stimulated Brillouin scattering.

A

11.20 mw

B

12.77 mw

C

13.08 mw

D

12.12 mw

The 2018 Nobel Prize in Physics has been awarded in laser physics for the optical tweezers and their applications to biological systems for the method of generating high-intensity, ultra-short optical pulses. Which of the following verifies the given statement? I: The 2018 Nobel Prize in Physics has been awarded in laser physics for the optical tweezers. II: The 2018 Nobel Prize in Physics has been awarded for applications of the optical tweezers to biological systems. III: The 2018 Nobel Prize in Physics has been awarded for the method of generating high-intensity, ultra-short optical pulses using the optical tweezers.

A

Only I

B

Only II and III

C

Only I and II

D

Only I and III

E

All of these

Twelve years ago, Raman’s age was six years more than half the age of his mother. Six years from now Raman’s mother will be 1.5 times as old as Raman. What is Raman’s present age?

A

56 years

B

54 years

C

55 years

D

52 years

Raman remembers that his marriage is before 20th July and after 13th July. His mother remembers that Raman’s marriage is after 16th July. His father remembers that Raman’s marriage is before 19th July. On which date of July is Raman’s marriage?

A

15 or 16

B

17 or 18

C

15 or 16 or 17

D

14 or 15 or 16

High frequency optical phonon is generated in stimulated Raman scattering.

A

False

B

True

If $$\sigma $$ is the total cross-section and f(θ), θ being the angle of scattering, is the scattering amplitude for a quantum mechanical elastic scattering by a spherically symmetric potential, then which of the following is true? Note that k is the magnitude of the wave vector along the $${{\bf{\hat z}}}$$ direction.

A

$$\sigma = {\left| {f\left( \theta \right)} \right|^2}$$

B

$$\sigma = \frac{{4\pi }}{k}{\left| {f\left( {\theta = 0} \right)} \right|^2}$$

C

$$\sigma = \frac{{4\pi }}{k} \times {\text{Imaginary part of }}{\left| {f\left( {\theta = 0} \right)} \right|^2}$$

D

$$\sigma = \frac{{4\pi }}{k}{\left| {f\left( \theta \right)} \right|^2}$$

Stimulated Raman scattering occur in ___________

A

Forward direction

B

Backward direction

C

Upward direction

D

Forward and backward direction

Stimulated Raman scattering may have an optical power threshold of may be three orders of magnitude ___________

Related Questions