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EEE036 Understanding Laser Presented by Li Ruiqian & Wu - PowerPoint PPT Presentation

Apr 10, 2023 •147 likes •434 views

EEE036 Understanding Laser Presented by Li Ruiqian & Wu Hongrui Looks familiar? Part I: What is laser? LASER L ight A mplification by S timulated E mission of R adiation How does it work? Some variations Laser Mechanism Part II:

  1. EEE036 Understanding Laser Presented by Li Ruiqian & Wu Hongrui

  2. Looks familiar?

  3. Part I: What is laser?

  4. LASER L ight A mplification by S timulated E mission of R adiation

  5. How does it work?

  6. Some variations

  7. Laser Mechanism

  8. Part II: Special Properties of laser

  9. Monochromaticity Something with a single colour

  10. Coherence in laser ● Spatial coherence Same time, different point ● Temporal coherence Different time, same point

  11. Simple Illustration

  12. Directionality & Brightness Remember him? You shall not pass unless in the right direction!!!

  13. Part III: Implications of laser

  14. Ring lasers Commonly seen in cars and ships ● A device used to measure rotation ●

  15. Mechanism of ring lasers

  16. Optical Communication ● The use of semiconductor lasers ● Present in transmitters ● Higher output power and efficiency ● Can be easily modulated

  17. Part IV: Experiments

  18. Simulation & Analysis

  19. Erbium-Doped Fiber Amplifier (EDFA)

  21. Data input Experiment 1 2 3 Pump Wavelength 980 980 980 (nm) Signal 1550 1550 1550 Wavelength (nm) Pump Power 100 150 100 (mW) Signal Power 0.03 0.03 0.06 (mW) Doped Fiber 10 10 10 Langth (m) Doped Fiber Core 5.5 5.5 5.5 Diameter (um)

  22. Graphs

  26. Analysis > Effects of varying Signal Power input > Effects of varying Pump Power input > Implications: Different power source on the power output of the laser

  27. Conclusion

  28. Thank you for listening

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