LASER

LASER is an acronym of

• Light Amplification by Spontaneous Emission of Radiation

• Light Amplification by Stimulated Emission of Radiation

• Light Advances by Spontaneous Emission of Radiation

• Light Advances by Stimulated Emission of Radiation

• Induced Absorbtion

• Spontaneous Emission

• Stimulated Emission

The condition/conditions required for the lasing action

• Metastable state

• Population Inversion

• Any excited state

• None

Pumping source for LASER production

• Optical

• Electrical

• Diode laser

• Water

The length of the lasing tube must be equal to

• integral multiple of wavelength of laser

• integral multiple of half of the wavelength of the laser

• wavelength of the laser

• Quarter of the wavelength of laser

In Ruby laser, the color of the ruby depends on

• Al ions concentration

• Oxygen concentration

• Cr ions concentration

• Si ion concentration

In Ruby laser, the laser of wavelength 693.4nm is produced during the transition of Cr ions from

• Ground state (E0) to Excited state (E2)

• Ground state(E0) to Metastable state (E1)

• Excited state (E2) to Metastable state (E1)

• Metastable state (E1) to Ground state (E0)

YAG stands for

Lasers are used in

• Cutting, drilling & welding

• Surgeries

• Scanners

• Telecommunication

Range finder using laser (LIDAR) works on the principle of