New on-chip laser frequency comb is 100 times more efficient than previous versions

On-chip laser frequency combs--lasers that emit multiple frequencies or colors of light simultaneously separated like the tooth on a comb--are a promising technology for a range of applications including environmental monitoring, optical computing, astronomy, and metrology. However, on-chip frequency combs are still limited by one serious problem--they are not always efficient. There are several ways to mitigate the efficiency problem, but they all suffer from trade-offs. For example, combs can ...