Resonant structured optical transistor

A resonant-structured optical transistor comprising:

• a nonlinear medium configured to generate a second harmonic wave through second-order nonlinear interaction with an incident pump wave, and generate an amplified signal wave and a converted wave having a difference frequency through second-order nonlinear interaction between the incident signal wave and the second harmonic wave;
• a first mirror configured to transmit, to the nonlinear medium, the pump wave or the signal wave incident to the nonlinear medium, and reflects the second harmonic wave on one surface of the nonlinear medium;
• and
• a second mirror configured to transmit the pump wave, the signal wave, or the converted wave, and reflects the second harmonic wave on another surface of the nonlinear medium,
• wherein the pump wave is incident to the nonlinear medium through the first mirror in a first operation mode, and the pump wave and the signal wave are incident to the nonlinear medium through the first mirror in a second operation mode.