Explain the construction and working of Ruby Laser.
Explain the following terms: i. Spontaneous emission ii. Stimulated emission
Explain with principle, construction and working of semiconductor laser.
Describe the construction and working of He-Ne laser with energy level diagram
Illustrate how photons interact with mater in case of Laser and derive the expression for energy density of radiation in terms of Einstein coefficients.
What are conditions and components required to construct a laser?
Obtain the conditions for amplification and population inversion for a homo junction semi conductor Laser.
Write a brief note on He-Ne LASER focusing on its working and applications.
With neat diagrams, explain the construction and working of He-Ne laser.
State the working principle of semiconductor laser.
Illustrate the principle, construction and working of Ruby laser with suitable diagram.
Derive Einstein’s A and B coefficients for LASER transitions and find their relation.
A homojunction semiconductor laser constructed by using a direct band gap semiconductor of energy gap 1.44eV. Find the wavelength of the emitted radiation.
The band gap of GaAs is 1.42eV. What is the wavelength of the laser beam emitted by a GaAs diode laser?
A semiconductor diode laser has a peak emission wavelength of 1.55 µm.Find its band gap in electron volt.