Mode control of vertical-cavity surface-emitting lasers by germanium coating

Shu Woei Chiou*, Kuo-Jui Lin, Chien Ping Lee, Hung Pin Yang, Chia Pin Sung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


We have successfully developed a selective surface coating technique to control the modal behavior of the ion-implanted vertical-cavity surface-emitting laser (VCSEL). With selective deposition of a germanium coating by the lift-off process, we could spatially control the threshold gain condition of the VCSEL to support the single transverse mode. The threshold current is 7 mA and single transverse mode operation is maintained up to 1 mW. The method is simple and nondestructive compared with other techniques.

Original languageEnglish
Pages (from-to)614-616
Number of pages3
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number2 A
StatePublished - Feb 2001


  • AR coating
  • Proton implant
  • Single-mode


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