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Optoelectronic DevicesSlide 1: IntroductionSlide 2: Aim of Presentation• Optoelectronic Devices• Categorization of Optoelectronics• Type of Optoelectronic Devices• EmittersSlide 3: Optoelectronic devices are a combination of electronic device and optics (light). Optoelectronic devices convert electrical to optical and optical to electrical transducers. It is based on the quantum mechanical effects of light on electronic devices.Slide 4: Pictorial presentation of optoelectronic devicesSlide 5: Categorization of optoelectronicsDevice that converts electric to light (visible or invisible light) is called Emitters.Device that convents light into electricity in non-solid state device is called photoemissive and in solid state device is called photodetectors.Slide 6: Types of optoelectronicsEmitters: As said earlier emitters are sub-classified into LED, Laser (LD) and IR.Couplers or Insulators: A device that transfers electrical signal between two isolated circuits by using lightSensors: It is a converter that measures a physical quantity and converts it into a signal which can be read by an observer or by an electronic instrument/device. It is classified into photodetectors and photo emissiveSlide 7: In this presentation we are going to learn more about emitters.• LED’s (Light-emitting diodes)• LD (Laser diodes)• IR (Infrared)Slide 8: LED’s : It is a semiconductor diode that emit incoherent narrow-spectrum light when electrically biased in forward direction of p-n junction. Early LED’s emitted low-intensity red light, but modern versions are available across the visible, ultraviolet, and infrared wavelength with very high brightness.Slide 9: The following are the colors and wavelength o LED’sSlide 10: Application of LED’s. It is used in • Visual Signals• Sensors• Communication• Television, DVD player• Barcode scannersSlide 11: Here are the examples.Slide 12: Laser diode is an electrically pumped semiconductor laser in which the active medium is formed by a p-n junction of a semiconductor diode. Laser diode are mono-chromatic and coherent.Slide 13: The following are wavelength of laser diodes.Slide 14: Application of LD’s. It is used in • Telecommunication• Barcode readers• CD/DVD, HD, Blu-ray players• Industrial applicationSlide 15: Here are the examples.Slide 16: Infrared was discovered by Astronomer William Herschel. Infrared light is electromagnetic radiation with longer wavelengths than those of visible light. IR are mostly used in industrial, scientific and medical applications.Slide 17: Application of IR. It is used in• Hyperspectral imaging• Heating• Communications• Climatology• AstronomySlide 18: Here are the examples.Slide 19: Thank you for viewing my PPT.
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Aim of PresentationOptoelectronic DevicesCategorization of OptoelectronicsType of Optoelectronic DevicesEmitters– Light-Emitting Diodes (LEDs)– Laser Diode (LDs)– Infrared (IR)
Optoelectronic Device means
Optoelectronic Devices: A study and application of electronic devices that source, detect and control light.
Based on the quantum mechanical effects of light on electronic materials.
Categorization of Optoelectronics
Device that converts electricity into light (Visible or invisible) is called Emitters.
Device that convets light into electricity. It include Photoemissive (non-solid state) devices and Photodetectors (Solid-state devices).
Optoelectronic Device
Emitters Sensors
IR Laser
Couplers or Isolators
LED
Type of Optoelectronic Devices
Photodetectors
Photoemissive
EmittersLight-emitting diodes (LEDs)
(display, lighting…)Laser diodes
(data storage, telecommunication,…)Infrared
(astronomy, communications,…)
Light-Emitting Diodes (LEDs)
Light-Emitting Diodes (LEDs) is a Semiconductor diode that emits incoherent narrow-spectrum light when electrically biased in the forward direction of the p-n juction
Color Wavelength [nm] Voltage drop [ΔV] Infrared λ > 760 ΔV < 1.63
Red 610 < λ < 760 1.63 < ΔV < 2.03
Orange 590 < λ < 610 2.03 < ΔV < 2.10
Yellow 570 < λ < 590 2.10 < ΔV < 2.18
Green 500 < λ < 570 1.9[62] < ΔV < 4.0
Blue 450 < λ < 500 2.48 < ΔV < 3.7
Violet 400 < λ < 450 2.76 < ΔV < 4.0
Purple multiple types 2.48 < ΔV < 3.7
Ultraviolet λ < 400 3.1 < ΔV < 4.4
Pink multiple types ΔV ~ 3.3[68]
White Broad spectrum ΔV = 3.5
Laser Diodes (LDs)
Laser Diode (LDs) is an electrically pumped semiconductor laser in which the active medium is formed by a p-n junction of a semiconductor diode.
375 nm Excitation of Hoechst stain, Calcium Blue, and other fluorescent dyes in fluorescence microscopy
405 nm - 445 nm InGaN blue-violet laser, in Blu-ray Disc and HD DVD drives, multimode diode
473 nm Sky blue laser pointers, still very expensive, output of DPSS systems
485 nm Excitation of GFP and other fluorescent dyes
510 nm (To ~525 nm) green diodes recently (2010) developed by Nichia and OSRAM for laser projectors.
532 nmDPSS green laser, frequency doubled from 1064 nm by means of a KTP-crystal, for use in light shows and laser pointers
635 nm AlGaInP better red laser pointers, same power subjectively twice as bright as 650 nm
640 nm High-brightness red DPSS laser pointers
650 nm GaInP/AlGaInP CDDVD, cheap red laser pointers
670 nm AlGaInP bar code readers, first diode laser pointers (now obsolete, replaced by brighter 650nm and 671nm DPSS)
671 nm Spectroscopy, DNA sequencing, high-power red DPSS laser pointers
760 nm AlGaInP gas sensing: O2
785 nm GaAlAs Compact Disc drives
808 nm GaAlAs pumps in DPSS Nd:YAG lasers (e.g. in green laser pointers or as arrays in higher-powered lasers)
848 nm Laser mice
980 nm InGaAs pump for optical amplifiers, for Yb:YAG DPSS lasers
1064 nm AlGaAs fiber-optic communication, DPSS laser pump frequency1310 nm – 1654 nm InGaAsP, InGaAsN fiber-optic communication, optical amplifiers, NH3,CH4
1877 nm-3330 nm GaInAsSb gas sensing: H2O, CO2,CO,C2H2,CH4
Application of LDs
TelecommunicationBarcode readersCD/DVD, HD, Blu-ray playersIndustrial application
Infrared (IR)Infrared (IR) light
is electromagnetic radiation with longer wavelengths than those of visible light, extending from the nominal red edge of the visible spectrum at 700 nanometres (nm) to 1 mm.
IR was discovered in 1800 by astronomer William Herschel.
Division Name Abbreviation Wavelength Photon Energy
Near-infrared NIR, IR-A DIN 0.75–1.4 µm 0.9–1.7 eV
Short-wavelength infrared SWIR, IR-B DIN 1.4-3 µm 0.4–0.9 eV
Mid-wavelength infrared
MWIR, IR-C DIN; MidIR.[7] Also called intermediate infrared (IIR) 3–8 µm 150–400 meV
Long-wavelength infrared LWIR, IR-C DIN 8–15 µm 80–150 meV
Far infrared FIR 15–1,000 µm 1.2–80 meV