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Becoz population inversion is not achievable in case of two level laser system...
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What type of laser is a thor laser?
Low level laser also referred to as a cold laser.
Why 4 level laser system is better than 3 level laser system?
Three and Four Level Laser SchemesWe have said that the two level scheme is not generally feasible for laser action. There are two main reasons for this. The first reason is that the energy being used to pump the particles into the upper laser state has an equal probability of stimulating them back down. Thus it is not possible to get nore than half of the particles into the excited state. The three level scheme gets around this problem by first exciting the particles to an excited state higher in energy than the upper laser state.(See figure below) The particles then quickly decay down into the upper laser state. It is important for the pumped state to have a short lifetime for spontaneous emission compared to the upper laser state. The upper laser state should have as long a lifetime (for spontaneous emission) as possible, so that the particles live long enough to be stimulated and thus contribute to the gain.The four level laser scheme goes one step further and also depopulates the lower laser level by a fast decay process.(see figure below) This greatly decreases the loss of laser photons (v2) by stimulated absorption processes since the particles in the lower laser level have a short life-time for spontaneous emission.
How do you get past level 2 in Spyro 2?
If you mean quicksilver vault just find the laser puzzles complete them and then go to the visible quicksilver to finish level
What is the highest possible level on mass effect 2?
Level 30
Where is it possible to learn about laser systems?
You can learn about laser systems at Universal Laser Systems, Palomar, Laser Learning, Laser Star, E Science News, Lensar, CMS Laser, How Stuff Works and Telesis.
How is Dewalt laser level being used?
Dewalt laser level is used in a DIY project, home, and building construction site for leveling or making a line for tiling, picture wall hanging, Deck Etc.
What is difference between three and four level laser?
A class IV laser will blind you much faster.
How does a simple laser level work?
Very simple laser levels are just a laser pointer mounted on an adjustable mount, which the user has to adjust using an inbuilt spirit level. More advanced levels use self leveling devices, which hang the laser on a pivot so it self adjusts as long as the case is somewhere near level.
Why two level pumping scheme is not suitable for laser action?
Actually two level scheme has serious difficulty. In two level upward (level 1 to 2)transition and downward transitions(2 to 1) occurs. In steady state, the population inversion not obtain. (population inversion Means the numbers of atom at level 2 is greater than level 1)
Is it possible for some laser printers to not need an imaging drum to work?
No all laser printers require an imaging drum to in order for the laser to write the image on.
What are the conditions for laser?
Two most important :- 1. The beam should be perfectly coherent and, 2. Amplification and Stimulation should be at high level
What are the passwords for gamma bros?
1. Super laser - super 2. New ship - ship 2 3. New ship - ship 3 4. Go to level 2 - golvl2 5. Go to level 3 - golvl3 Answers by Pepsi906
