An optical "frequency comb" is a very accurate tool for measuring different colors - or frequencies of light. Techniques made by recent advances in ultrafast laser can accurately measure many frequencies more than any other device. Optical Frequency combs are already widely used in many sectors but specially used in metrology laboratories and physics research, and they are starting to become commercially available.
|Optical frequency comb image|
Optical Frequency Comb
|Blue wave much faster than red|
|tooth of the comb with different colors|
|Colors or light wave coincide at regular interval|