1.8 Double Heterostructures

1.8 Explain how a double heterostructure works. Who are the Nobel prize winners for this invention?

A double heterostructure is a sandwich of one material between another material. It is a PIN junction, and the material of the intrinsic region of the PIN junction is a material with a smaller bandgap than the P and N regions. This structure…

  • Enables direct current injection via trapping of carriers
  • Light is generated in the intrinsic region where carriers are recombined.
  • Light is confined for a resonator feedback system as the intrinsic region layer serves as a waveguide.
  • It can be assumed that nearly all carriers recombine in the intrinsic region.

Nobel prize winners are (2000): Jack Kilby (1/2), Zhores Alferov (1/4), Herbert Kroemer (1/4)


1.3 Advantages and disadvantages Diode Lasers have relative to gas ore solid-state lasers

1.3 List three advantages and three disadvantages diode lasers have relative to gas or solid-state lasers.

1.4 What are the most common applications of diode lasers? Can you think of any other applications that are not mentioned in the text? (Diode Lasers and Photonic Integrated Circuits 2nd Edition)

  • CD/DVD, optical mice, blu-ray
  • Fiber optic comms
  • PICs in optical networks
  • Medical, OCT
  • Remote sensing, LIDAR, gyroscopes