Visible continuous emission from a silica microphotonic device by third-harmonic generation

Tal Carmon*, Kerry J. Vahala

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Nonlinear harmonic generation is widely used to extend the emission wavelength of laser sources. These devices typically require high peak powers to generate sufficient nonlinear optical response. Here, we demonstrate experimentally and analyse theoretically continuous-wave, visible emission from a silica microresonator on a silicon chip by third-harmonic generation. Emission is observed with pump powers of less than 300 W, and is verified to scale cubically with pump power. We also observe third-order sum-frequency generation and mixing of the pump with a concomitant Raman laser within the same structure, giving rise to emission of various colours. In addition to providing low-power operation, this result opens the possibility of silicon microphotonic emitters spanning all the way down to the ultraviolet and operating continuously.

Original languageEnglish
Pages (from-to)430-435
Number of pages6
JournalNature Physics
Issue number6
StatePublished - Jun 2007
Externally publishedYes


Dive into the research topics of 'Visible continuous emission from a silica microphotonic device by third-harmonic generation'. Together they form a unique fingerprint.

Cite this