  We show a concept of optical frequency tweezers for tweezing light in the
optical frequency domain with a high resolution, which is the frequency version
of the optical tweezers for spatial manipulation of microscopic objects. We
report the proof-of-principle experiment via frequency conversion inside a
cavity only for the converted light. Thanks to the atypical configuration, the
experimental result successfully achieves the tweezing operation in the
frequency domain, which picks a light at a target frequency from the
frequency-multiplexed input light and converts to a different frequency,
without touching any other light sitting in different frequency positions and
shaking frequency by the pump light.
