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Difference Between Led And Laser Diode Pdf

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Spectral width is defined as the 3dB optical power width and it is measured in nanometers nm or microns.

It uses p-n junction to emit coherent light in which all the waves are at the same frequency and phase. And since a p-n junction is used to produce laser light, this device is named as a laser diode. The light from sunlight or from most of the artificial light sources contains waves of multiple wavelengths and they are out of phase with each other. The light waves from monochromatic light sources like incandescent bulb also are not in phase with each other. In contrast to the previous light sources, laser diodes produce a narrow beam of laser light in which all the light waves have similar wavelengths and they travel together with their peaks lined up.

Differences between LED and LASER Diode

The most significant difference between the LED and diode is that the LED emits the light while the diode allows the current to flow only in one direction and opposes the flow in the opposite direction. The other differences between the diode and LED are shown below in the comparison chart.

The Germanium Arsenide has the property of emitting the light when their electrons of conduction band give energy to the holes of the valence band. The diode is used in the electrical circuit for affecting the electric current. It is a semiconductor diode which conducts only in one direction. Converts energy into heat. Application Rectification i.

Emits light Uses Indicators in seven segment displays, use as light source. Rectifiers, voltage multipliers, clamping, etc. The diode which emits light during the conduction is known as the light emitting diode or LED. It works on the phenomenon of the electro-luminance in which the semiconductor material emits light when placed under the influence of the electric field. When the forward biasing is applied across the semiconductor material the free electrons crosses the N-region and enters into the P-region.

In p-region, the holes are the majority charge carrier. The free electrons are in the conduction band and the holes are in the valence band i. The electrons and holes are recombined only when they have the same energy.

For recombination, the electrons give the energy to the holes. They give energy in the form of the photons or light. Therefore, the LED emits light in the forward biasing. The semiconductor material silicon and germanium transfer energy in the form of heat. While the GaP and GaAs give their energy in the form of light. The LEDs has many advantages likes smaller in size, requires less power, available in different colour, requires less area, requires low DC Power etc.

The only drawback of the LED is that they get easily damaged by the overvoltage or overcurrent. The diode is a two terminal semiconductor device which consists the n-type and p-type semiconductor material. These material are connected together. The diode allows current to flows only in one direction i. As the diode conducts current only in one direction so it is used as a rectifier.

The diode behaves like conductors when the small voltage is applied to it. The current causes the voltage drop across the diode. The LED and diode is made of different material, thereby they have different properties.

The diode is made of silicon or germanium, therefore, it gives energy in the form of heat. And the LED is made by gallium arsenide and gallium phosphide thus gives energy in the form of light. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Skip to content The most significant difference between the LED and diode is that the LED emits the light while the diode allows the current to flow only in one direction and opposes the flow in the opposite direction.

While the LED is the type of diode which emits light. Whereas the LED is made of the gallium arsenide and gallium phosphide whose electrons emit light while transferring the energy.

The diode converts the alternating current into the direct current, whereas the led converts the voltage into the light. The diode has high reverse breakdown voltage while the LED has the low reverse breakdown voltage. The reverse breakdown voltage is the voltage that allows current to conducts in the reverse bias.

In the diode, the on-state voltage is 0. Whereas in LED the on-state voltage is approximately lies between 1. The diode rectifies the alternating current while the LED display the light. The LED is used in the automotive headlamps, traffic signals, camera flashes, in medical devices etc. While the diode is used in clipping and clamping circuit, voltage rectifiers, voltage multipliers.

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Differences between LED and LASER Diode

Contemporary white light-emitting diodes LEDs are much more efficient than compact fluorescent lamps and hence are rapidly capturing the market for general illumination. LEDs are also replacing halogen lamps or even newer xenon based lamps in automotive headlamps. Because laser diodes are inherently much brighter and often more efficient than corresponding LEDs, there is great research interest in developing laser diode based illumination systems. Operating at higher current densities and with smaller form factors, laser diodes may outperform LEDs in the future. This article reviews the possibilities and challenges in the integration of visible laser diodes in future illumination systems. Solid-state lighting SSL has revolutionized the illumination situation and is steadily progressing in terms of power efficiency and diversity for future applications [1, 2].

The most significant difference between the LED and diode is that the LED emits the light while the diode allows the current to flow only in one direction and opposes the flow in the opposite direction. The other differences between the diode and LED are shown below in the comparison chart. The Germanium Arsenide has the property of emitting the light when their electrons of conduction band give energy to the holes of the valence band. The diode is used in the electrical circuit for affecting the electric current. It is a semiconductor diode which conducts only in one direction. Converts energy into heat.

LED emits light as the consequence of charge carriers recombination across P-N Junction, while LASER emits light as a result of photons striking the atom and compels them to release the similar photon. A laser works on the principle of stimulated emission and LED works on the principle of Electro-luminance. Thus, in LASER every released photon strike another atom to release similar photon and therefore, the beam of light thus produced is coherent in nature. On the contrary, the light produced by LED is incoherent. The LED is considered as the optical source for various crucial applications. The main principle behind its working is electro-luminance.

Difference between LED and Laser Light Source

A laser diode , LD , injection laser diode ILD , or diode laser is a semiconductor device similar to a light-emitting diode in which a diode pumped directly with electrical current can create lasing conditions at the diode's junction. Driven by voltage, the doped p-n-transition allows for recombination of an electron with a hole. Due to the drop of the electron from a higher energy level to a lower one, radiation, in the form of an emitted photon is generated. This is spontaneous emission.

Semiconductor Devices for Optical Communication pp Cite as. Beam width at half-intensity in the directions perpendicular and parallel to the junction plane. Unable to display preview. Download preview PDF. Skip to main content.

Key Differences Between LED and LASER

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Laser diodes and LEDs for fiber optical communication

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