The invention relates to an optical blade and a hair cutting device, adapted for cutting a hair near skin of a human body part or animal body part. The optical blade (1), especially for use in a hair cutting device, comprises a blade body (3) adapted for guiding optical radiation, and a tapered end (2) adapted for allowing the optical radiation to exit the optical blade (1), wherein the tapered end (2) comprises a reflector adapted for redirecting the optical radiation before it exits the optical blade. In this way the balance of closeness vs. irritation is improved beyond the capabilities of conventional shaving systems and an optical blade is provided which is insensitive to the type of shaving additive used, while the manufacturing of the optical blade is made easier and costs are reduced.