1 Mid term – Laser Swarm Optical Receiving Payload Single-Photon Detection -Photonmultiplier tube -Single Photon Avalanche Diode(SPAD) Wavelength Estimation.

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Presentation transcript:

1 Mid term – Laser Swarm Optical Receiving Payload Single-Photon Detection -Photonmultiplier tube -Single Photon Avalanche Diode(SPAD) Wavelength Estimation -Atmospheric transmittance -Wavelength ratio

2 Mid term – Laser Swarm Optical Receiving Payload Single-Photon Detection - Convert light(photons) to measurable quanlity(electronical V or I) -Multiple ways -Photonmultiplier tube -SPAD -Quantum dot(under developed)

3 Mid term – Laser Swarm Photonmultuplier tube Typically 1000 to 2000v used

4 Mid term – Laser Swarm SPAD Single Photon Avalanche Diode -Based on p-n junction -Reversed biased voltage -Sensing avalanche current -Small size, less power

5 Mid term – Laser Swarm Atmospheric Absorption Bands

6 Mid term – Laser Swarm Wavelength estimation General sufficient wavelength range 400nm to 900nm Atmospheric transmittance Vs. Photon detection efficiency Wavelength ratio R = transmittance^2*efficiency

7 Mid term – Laser Swarm Wavelength estimation

8 Mid term – Laser Swarm Ocean Reflectance Large part of the Earth is covered by water ‘blue’ has the highest absorption depth However, the fractional reflectance is highest

9 Mid term – Laser Swarm Continuous Versus Pulsed Waves By default: continuous By altering the laser: pulsed ~ nano- or picoseconds Analysis of individual pulses Increased spatial resolution

10 Mid term – Laser Swarm Blue types of laser Optimum wavelength according to analysis ~ 425 – 500 [nm] Possible ‘blue’ lasers Gas lasers Wavelength: [nm] (Helium-Cadmium) Wavelength: 488 [nm] (Argon) Solid-State laser (Nd-YAG: neodymium-doped yttrium aluminium garnet) Wavelength: 946 [nm] Diode laser Difficult to produce for lifetimes > 1 year

11 Mid term – Laser Swarm Nd-YAG wavelength correction Second Harmonic Generation (non-linear optics) Nd-YAG energy levels Non-linear (Lithium-Boron) frequency doubling crystal

12 Mid term – Laser Swarm From 946 [nm] to 473 [nm]

13 Mid term – Laser Swarm Pulse Duration Deviation Change pulse length (and pulse energy) over specific time intervals Pockel Cells (E-field)Acoustic-Optic Switches (RF 25 – 50 MHz)