Barve različnih polprevodniških izvorov in občutljivost oči

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Presentation transcript:

Barve različnih polprevodniških izvorov in občutljivost oči Valovna dolžina (nm)

Elektronska stanja v heterostrukturah Koncentracija (omejevanje) elektronov in svetlobe v tanki plasti Kvantne jame, enojne in večkratne

Kako lahko omejujemo elektrone

Elektroni v pn spoju in v hetero-strukturi

LED: kako do svetlobe iz polprevodnika? Geometrija je pomembna zaradi loma na meji polprevodnika

Kako do svetlobe iz laserske diode?

Tipična laserska dioda manjše moči

Laserska dioda 10 W

OCLARO 10 W laserska dioda z optičnim vlaknom

OCLARO 10 W laserska dioda z optičnim vlaknom - karakteristike

Laserski resonatorji za polprevodniške laserje

Sestavljen laser za velike moči

“LASERS” ….. Example: High-Power Diodes Stacks of linear arrays of diode lasers 100’s to kilowatts of power near infrared wavelengths used for materials processing

“LASERS” ….. Example: CD Diode Lasers output in the near-infrared ≈ 5 – 50mW output actual laser chip from a CD player

VCSELs high performance and low cost advantages. 1. The structure can be integrated in two-dimensional array configuration. 2. Low threshold currents enable high-density arrays. 3. Surface-normal emission and nearly identical to the photo detector geometry -> easy alignment and packaging. 4. Circular and low divergence output beams eliminate the need for corrective optics.

5. Passive versus active fiber alignment, combined with high fiber-coupling efficiency. 6. Low-cost potential because the devices are completed and tested at the wafer level. 7. Lower temperature-sensitivity compared to edge-emitting laser diodes. 8. High transmission speed with low power consumption.

Quantum cascade lasers

Quantum cascade lasers Band diagram Layer sequence Emission spectrum at room temperature Light- and Volt-current characteristics

Laser na proste elektrone

The European x-ray free electron laser (European XFEL) an X-ray research laser facility currently under construction planned to be operational by the end of 2017. 12 participating countries (Denmark, France, Germany, Greece, Hungary, Italy, Poland, Russia, Slovakia, Spain, Sweden and Switzerland) Electrons will be accelerated to an energy of up to 17.5 GeV by a 2.1 km long superconducting linear accelerator. Total length 3.4 km. Wavelength 0.05 to 6 nm