Why is High Transition Probability Important in Semiconductor Lasers?

In summary, the theory for a semiconductor laser states that for a radiative transition to occur, the probability must be higher than the probability for non-radiative transfer of energy to the lattice. This is necessary in order to have enough photons for the laser to emit light. However, some photons are absorbed in the material for the recombination of electron hole pairs, resulting in a lower probability of radiative photons being emitted.
  • #1
kpstp88
3
0
i am not able to understand this line..

in semiconductor laser the transition probablity for a radiative transition across the conduction and valence gap must be high and must exceed the probablity for non -radiative transfer of energy to the lattice.

please explain this theory.
 
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  • #2
In other words, you won't have a laser if the electron transfers its energy to the lattice.
 
  • #3
it is so because, all the photons are not used in emitting light..the probabilty of radiative photons should be more so that we can get enough radiations in form of laser.actually some of the photons are absorbed in the material for the recombination of electron hole pairs.thus they do not emit radiations.
 

Related to Why is High Transition Probability Important in Semiconductor Lasers?

What is a semiconductor laser?

A semiconductor laser is a type of laser that uses a semiconductor material as its active medium. It converts electrical energy into light through a process called stimulated emission, resulting in a coherent and highly directional beam of light.

How does a semiconductor laser work?

A semiconductor laser works by injecting a current into a specially designed semiconductor material, usually made of compounds like gallium arsenide or indium phosphide. This creates a population inversion, where more electrons are in the higher energy state than in the lower energy state. When these electrons are stimulated, they release photons and produce laser light.

What are the advantages of semiconductor lasers?

Semiconductor lasers have several advantages, including their small size, low cost, and high efficiency. They also have a longer lifetime and can be easily integrated into electronic devices. Additionally, they can emit light in a wide range of wavelengths, making them useful for various applications.

What are some common uses of semiconductor lasers?

Semiconductor lasers have a wide range of applications, including telecommunications, barcode scanners, laser printers, and optical storage devices. They are also used in medical and scientific equipment, such as in surgery, spectroscopy, and holography. They are also used in the military for targeting and guidance systems.

What are some potential future developments for semiconductor lasers?

Some potential future developments for semiconductor lasers include increasing their power and efficiency, as well as expanding the range of wavelengths they can emit. There is also ongoing research to improve their stability and reduce their sensitivity to temperature changes. Additionally, there is ongoing research to develop new types of semiconductor materials for use in lasers, which could lead to new and improved applications.

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