10 Questions
What are the applications of a He-Ne laser?
Reading bar codes in supermarkets, holography, industrial and scientific uses
What is the gain medium used in a He-Ne laser?
Helium-Neon gas mixture
What gives the ruby crystal its characteristic pink or red color?
Chromium atoms
What type of laser is a ruby laser and what kind of light does it produce?
Solid-state laser, produces red light at 694.3 nm
What is the principle behind achieving population inversion in a He-Ne laser?
Energy transfer from excited Helium atoms to Neon atoms
What is the process called that produces a population inversion?
Pumping
What is the maximum concentration of Nd+3 ions in Yttrium aluminium garnet (YAG) crystal?
1 to 1.5%
What is the role of YAG in Nd: YAG laser?
It leads to splitting of energy levels of Nd+3 ions and modifies transition probabilities.
What is the length and diameter of the Nd: YAG laser rod?
Length: 10 cm, Diameter: 12mm
What is the efficiency of a typical ND:YAG laser and how much waste heat does it produce compared to laser output?
Efficiency: about 3%, Waste heat: thirty times as much as laser output
This quiz covers the basic concepts of a laser including absorption, spontaneous emission, stimulated emission, and population inversion. It also discusses the types of lasers such as Nd:YAG Laser and CO2 Laser. Presented by Eng. Mohamed Zein El-Din Moussa Ali M.Sc National Institute of Laser Enhanced Sciences (NILES)- Cairo University.
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