Comparison Between Laser And Led Pdf
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A light-emitting diode LED is a semiconductor light source that emits light when current flows through it.
As the wide application of fiber optic system, optical light source plays a more and more important part in it. Among which, LED and Laser light source are two types of semiconductor light sources. The following article will discuss about laser vs LED and list the differences between laser and Led light source.
Benefit deriving from the use of light is known since ancient time, but, only in the last decades of twentieth century, we witnessed the rapid expansion of knowledge and techniques. Light-emitted diode LED -based devices represent the emerging and safest tool for the treatment of many conditions such as skin inflammatory conditions, aging, and disorders linked to hair growth. The present work reviews the current knowledge about LED-based therapeutic approaches in different skin and hair disorders.
Spectral width is defined as the 3dB optical power width and it is measured in nanometers nm or microns. A bigger spectral width enables higher link bandwidth on the FOC. For an LED the spectral width is about 80 nm when it operates at nm and 40 nm at nm. The spectral width of a LD is 3 nm for operation at nm and 1 nm at nm.
They are however slower than Distributed Feedback lasers. FP lasers also emit light at a number of discrete wavelengths. BH lasers were used extensively in the early days, while MQW eventually took over and they are used more in present day applications.
MQW lasers have several advantages of over BH lasers. These include:. DFB lasers are monochromatic, i. They are also faster and quieter than what MQW lasers are. Used extensively in high-speed applications, MQW lasers offer enhanced linearity, high performance and have narrow spectral widths. MQW lasers are used in both digital and analog applications. VCSELs have low threshold currents that give them high intrinsic modulation bandwidths and low power consumption. The main disadvantages of VCSELs include complex manufacturing processes, high cost and limited application support only nm and nm.
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Difference between LED and Laser Light Source
Laser diodes play an important role in our everyday lives. They are very cheap and small. Laser diodes are the smallest of all the known lasers. Their size is a fraction of a millimeter. Laser diodes are also known as semiconductor lasers, junction lasers, junction diode lasers or injection lasers.
Spectral width is defined as the 3dB optical power width and it is measured in nanometers nm or microns. A bigger spectral width enables higher link bandwidth on the FOC. For an LED the spectral width is about 80 nm when it operates at nm and 40 nm at nm. The spectral width of a LD is 3 nm for operation at nm and 1 nm at nm. They are however slower than Distributed Feedback lasers. FP lasers also emit light at a number of discrete wavelengths.
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Two different designs of the illumination path are presented, which are based on a LASER light source as well as a LED light source. Due to low beam divergence.
Difference between LED and LASER
LED's are small in size, longer life, reliable and require little power. Here generation photon by spontaneous emittion. LED's produce a divergent and incohrent light beam. Their response is fast. A wide range of wavelengths is available.
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.
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Request PDF | Comparison between blue lasers and light-emitting of whether a laser, light-emitting diode (LED) or broadband polarized light.
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