Quantum dot laser

we have discussed the following content
Introduction
Construction
Working
QD Laser vs Normal Laser
Market Demand
Application
Characteristics
Advantages
Disadvantages
Conclusion
Summary

1. Q uantum dot laser Presenter Sher khan Department of Electronics

2. Content Introduction Construction Working QD Laser vs Normal L aser Market Demand Application Characteristics Advantages Disadvantages Conclusion Summary

3. Introduction A quantum dot laser is a semiconductor laser that uses quantum dots as the active laser medium in its light emitting region. Quantum dots semiconductor particles a few nanometers in size, having optical and electronic properties Man-made crystals that have ability to convert a spectrum of light into different colors They are so small that they are sometimes called zero-dimensional or artificial atoms.

4. Construction

5. Working

6. QD laser vs Normal laser

7. Market demand Display, Medical Devices, Solar Cells, Photodetector/ Sensors, Lasers, Lighting (LED), Batteries and Energy Storage, and Transistors Datacom network Telecom Network Optics QD LASERS Telecom Network Data Network Optics

8. Applications Quantum dot lasers are used in healthcare Barcode readers Printing industry Fiber optical communication high resolution television

9. Characteristics Low threshold current Temperature stability Carrier diffusion bandgap absorption

10. Advantages High temperature stability Large modulation bandwidth Suppressed diffusion of non-equilibrium carriers to Reduced leakage Broad spectrum Gain is larger It is efficient laser

11. Disadvantages Difficult to manufacture very difficult to form high quality dot because of uniform size and higher density

12. Conclusion Semiconductor lasers with the quantum dot gain medium have been studied to improve the laser characteristics including low threshold currents density and high characteristic temperature. Surface density of QD's has a great effect on the performance. It leads to increasing the amount of radiation and hence increases the efficiency of the system. The effect of surface density on the gain, threshold current and characteristic temperature has been indicated.

13. Summary In this presentation we discussed about quantum dot laser Quantum dot laser is a semiconductor laser that use the quantum dots as an active laser medium in its light emitting region In quantum dot laser that the confinement in all three directions here the quantum dot play the role of active atoms By the varying of width and length of quantum dot laser We can get the particular wavelength of laser light