Table of Contents
- 1 How does a semiconductor laser differ from other laser?
- 2 How does a semiconductor laser differ from other laser explain main features of the semiconductor laser and its applications?
- 3 What is the principle of semiconductor laser write its any two advantage and disadvantage?
- 4 What type of semiconductor is used in lasers and why?
- 5 How does the temperature affect the output of a semiconductor laser?
How does a semiconductor laser differ from other laser?
The main difference between diode lasers and most of the other bulk solid-state lasers is the small size of the active region in the semiconductor structure, which is close to a p–n junction between the n-type region and p-type region; fundamental principles are described in Seeger (2004).
What is the characteristic feature of semiconductor laser?
Semiconductor Laser is used for a variety of applications by taking advantage of characteristics that include straightness, small emission spot size (several um), monochromaticity, high light density, and coherence.
What is the principle of semiconductor laser?
When a p-n junction diode is forward biased, the electrons from n – region and the holes from the p- region cross the junction and recombine with each other. During the recombination process, the light radiation (photons) is released from a certain specified direct band gap semiconductors like Ga-As.
How does a semiconductor laser differ from other laser explain main features of the semiconductor laser and its applications?
Unlike other lasers, semiconductor laser does not need mirrors to obtain the reflectivity needed to produce feedback mechanism. Reflection from the cleaved ends of the semiconductor chip is enough to produce lasing.
Why semiconductor lasers are advantageous over other types of lasers?
The advantages of semiconductor lasers are: small volume, lightweight, good reliability, long service life, and low power consumption. In addition, semiconductor laser adopted low voltage constant current power supply mode, hence provided low powder failure rate, safe operation, and low cost of maintenance.
In which region of the electromagnetic spectrum does the semiconductor laser lies?
infrared region
In which region of the electromagnetic spectrum, does the semiconductor laser lies? Explanation: In the gallium arsenide laser, the wavelength of the emitted laser is around 845 nm to 905 nm, which lies in the infrared region of the electromagnetic spectrum.
What is the principle of semiconductor laser write its any two advantage and disadvantage?
What are semiconductor lasers discuss about the different types of semiconductor lasers?
A semiconductor laser (LD) is a device that causes laser oscillation by flowing an electric current to semiconductor. The mechanism of light emission is the same as a light-emitting diode (LED). Light is generated by flowing the forward current to a p-n junction.
How is semiconductor laser population inversion achieved?
In a semiconductor laser there are energy bands not individual energy states. So population inversion must lead to an increase in the carrier concentration in the excited state (usually the conduction band). For a pn junction, ex- ternal injection of carriers by applying a forward bias can create population inversion.
What type of semiconductor is used in lasers and why?
The material which often used in semiconductor laser is the gallium Arsenide, therefore semiconductor laser is sometimes known as Gallium Arsenide Laser. It is also called Injection Laser. The semiconductor is made in unique manner for the semiconductor laser.
Why is a semiconductor laser diode the best choice as a light source for a long distant high bit rate communication link?
Because an LD has a much higher output power than an LED, it is capable of transmitting information over long distances. Consequently, and given the fact that the LD has a much narrower spectral width, it can provide high-bandwidth communication over long distances.
What is semiconductor injection laser?
The Semiconductor Injection Laser. Stimulated emission by the recombination of the injected carriers is encouraged in the semiconductor injection laser (also called the injection laser diode (ILD) or simply the injection laser) by the provision of an optical cavity in the crystal structure in order to provide the feedback of photons.
How does the temperature affect the output of a semiconductor laser?
The temperature has great effect on the output of the semiconductor laser. When the temperature increases then significant power losses occurs within the laser. That is why the semiconductor laser is sometimes cooled by liquid nitrogen or some other cooling system.
What is the beam divergence of a semiconductor laser?
Therefore the output beam does not have the same dimension in both vertical and horizontal axis. Hence the beam profile has an unusual shape. The beam divergence of semiconductor lasers is much greater than most of the lasers, depending on temperature, therefore ranging from 125 to 400 milli radians.
What are the advantages of injection laser?
This gives the injection laser several major advantages over other semiconductor sources (e.g. LEDs) that may be used for optical communications. These are as follows: 1. High radiance due to the amplifying effect of stimulated emission. Injection lasers will generally supply milliwatts of optical output power.