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

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Apr 10, 2023 147 likes •437 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:

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EEE036 Understanding Laser

Presented by Li Ruiqian & Wu Hongrui

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Looks familiar?

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Part I: What is laser?

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LASER Light Amplification by Stimulated Emission of Radiation

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How does it work?

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Some variations

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Laser Mechanism

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Part II: Special Properties

f laser

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Monochromaticity

Something with a single colour

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Coherence in laser

Spatial coherence
Temporal coherence

Same time, different point Different time, same point

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Simple Illustration

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Directionality & Brightness

You shall not pass unless in the right direction!!!

Remember him?

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Part III: Implications of laser

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Ring lasers

Commonly seen in cars and ships
A device used to measure rotation

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Mechanism of ring lasers

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Optical Communication

The use of semiconductor lasers
Present in transmitters
Higher output power and efficiency
Can be easily modulated

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Part IV: Experiments

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Simulation & Analysis

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Erbium-Doped Fiber Amplifier (EDFA)

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Data input

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

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Graphs

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

Analysis

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Conclusion

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