Atomic & Molecular Physics (CSIR Physical Sciences): Questions 17 - 18 of 18

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Passage

Equation Chromium ions cubic centimeter. All the atoms excited by the Equation radiation decay rapidly to level Equation which has a lifetime Equation

Three energy levels for Chromium ions

Three Energy Levels for Chromium Ions

In figure three distinct energy levels are shown. All atoms excited by radiation decay.

(June)

Question number: 17 (1 of 2 Based on Passage) Show Passage

» Atomic & Molecular Physics » Population Inversion

Appeared in Year: 2011

MCQ▾

Question

Assuming that there is no radiation of wavelength Equation present in the pumping cycle and that the pumping rate is R atoms per Equation , the population density in the level Equation builds up as:

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 18 (2 of 2 Based on Passage) Show Passage

» Atomic & Molecular Physics » Optical Pumping

Appeared in Year: 2011

MCQ▾

Question

The minimum pump power required (per cubic centimeter) to bring the system to transparency, i. e. , zero gain, is –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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