The disclosure generally relates to medical systems, devices and methods, and more particularly relates to dispersing heat during energy delivery to a tissue. The device may comprise two layers—a first layer which is optically transparent and a second later that may be both optically transparent and heat conductive. One or both of the layers may be configured to absorb energy (e.g., light energy), but together may transmit from about 50% to 99.9% of incident energy to the target tissue. One or both layers may comprise graphene or sapphire. One or both layers may comprise glass or plastic. The two layers may be any combination of glass, graphene, plastic, or sapphire. The two layers may be in physical contact with each other and either directly or indirectly bonded together.
