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Herb Kroemer Optical Patents: The alpha and the omega…. Kroemer Symposium John Bowers May 20 , 2013. Herb’s First Optical Patent: Double Heterostructure Laser. Filed: 1963 Issued: 1967 Expired: 1985. Patent 3,309,553.

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herb kroemer optical patents the alpha and the omega
Herb Kroemer Optical Patents:The alpha and the omega…

Kroemer Symposium

John Bowers

May 20, 2013

slide2

Herb’s First Optical Patent:

Double Heterostructure Laser

Filed: 1963

Issued: 1967

Expired: 1985

Patent 3,309,553

double heterostructure laser diode the first cw semiconductor laser
Double Heterostructure Laser Diode: The first cw semiconductor laser

Izuo Hayashi (left) and Morton Panish (1971) at Bell Labs were able to design the first semiconductor laser that operated continuously at room temperature. The need for semiconductor heterostructures for efficient laser diode operation was put forward by Herbert Kroemer. (Reprinted with permission of Alcatel–Lucent USA Inc.)

slide4

400x

M. B. Panish et al. APL 16(8), 1970

slide5

Carrier confinement

Heterojunction

Homojunction

Higher optical losses

slide6

Optical confinement

Heterojunction

Homojunction

1%

Index profile

10%

Intensity profile

n : the difference in the reflective index

d : the thickness of the active layer, C : Constant

slide8

How Important is this Invention?

All commercial diode lasers use double heterostructures

About $4B annually

Herb’s patent runs out

Laser Focus World Jan. 2013

slide9

Herb’s second optical patent

Light-emitting structures in silicon are more attractive from a fabrication standpoint…light generation in silicon is an inefficient process…

hybrid silicon ring i solator
Hybrid Silicon Ring Isolator

First experiment

Optimized design

Tien et al. “Silicon ring isolators with bonded nonreciprocal magneto-optic garnet” Optics Express (2011).

herb thank you
Herb: Thank you!
  • For your insights
  • For setting high standards in research, and faculty and students recruiting
  • For tolerating my research on hybrid III-V silicon photonics…the gain is in the III-V after all, not like those MIT guys…and you were 45 years ahead anyway.