Lasers and Optical Fibers

What does LASER stand for?

• • Light Amplification by Stimulated Emission of Radiation

• • Light Absorption by Stimulated Emission of Radiation

• • Light Acceleration by Stimulated Emission of Radiation

• • None of the above

Which of the following is a characteristic property of a LASER beam?

• • Coherent

• • Divergent

• • Incoherent

• • Dispersive

In a laser, population inversion refers to:

• • The condition where more electrons occupy the lower energy state.

• • The condition where more electrons occupy the higher energy state.

• • The condition where all electrons are in the ground state.

• • None of the above

Which state is considered a metastable state in laser physics?

• • Ground state

• • Excited state

• • Higher energy state with a long lifetime

• • A state with very short energy levels

What is the primary condition required for laser action?

• • Spontaneous emission

• • Population inversion

• • High thermal energy

• • High external pressure

Which laser is commonly used in barcode scanners?

• • Ruby laser

• • CO2 laser

• • Semiconductor diode laser

• • Helium-neon laser

What is the role of the metastable state in a laser system?

• • It allows for the absorption of energy.

• • It helps achieve population inversion.

• • It decreases the efficiency of the laser.

• • It promotes spontaneous emission.

Which of the following is a major application of lasers?

• • Laser cooling

• • Fiber optic communication

• • Bar code scanning

• • All of the above

What is the basic requirement for a semiconductor diode laser to work?

• • High temperature

• • Population inversion

• • A noble gas

• • Low power

What is the primary working principle of a laser printer?

• • Absorption of light

• • Stimulated emission of radiation

• • Reflection of light

• • Diffraction of light