Terahertz Emitter Based on Frequency Mixing in Microchip Solid-State Laser Cavity

Abstract

Abstract : This project is concerned with development of tunable time-coherent THz source of 0.1-10 THz frequency range. During Phase I of this SBIR we have developed a unique design for nonlinear THz wave generation based on Difference Frequency Generation method, which will deliver the maximum possible energy conversion from optical to THz frequency domains. In the further fabrication stage of this project two types of coherent THz source will be developed: a quasi-cw tunable (0.1/0.3THz - 10 THz) narrowband source with frequency line width 100MHz (line quality factor 10(exp 4), repetition rate 10kHz) based on OPO single mode laser, and a cw broadband tunable source with frequency line width 0.3THz based on DFB lasers. Developed multi-layer waveguide will provide the maximum possible efficiency of the nonlinear electromagnetic energy conversion from optical to THz domains. We expect to reach an average output power of 1mW required by the solicitation. The successful completion of this research project will benefit many new commercial markets in the future. Having coherent, tunable and handy THz source will bring scientists an opportunity to fully explore THz band. Particular applications include: spectroscopic miniature sensors of THz spectra of chem/bio-molecules; next generation THz electronics components with aim to future THz networks and computing chips; vision through clothing at the airport for security purposes; non-destructive imaging through teeth, since THz easily penetrates them; biological hyperspectral imaging of human body.