Bow-Tie Cavity for Terahertz Radiation

Abstract

We report on the development, testing, and performance analysis of a bow-tie resonant cavity for terahertz (THz) radiation, injected with a continuous-wave 2.55 THz quantum cascade laser. The bow-tie cavity employs a wire-grid polarizer as input/output coupler and a pair of copper spherical mirrors coated with an unprotected 500 nm thick gold layer. The improvements with respect to previous setups have led to a measured finesse value F=123, and a quality factor Q = 5.1x10^5. The resonator performances and the relevant parameters are theoretically predicted and discussed, and a comparison among simulated and experimental spectra is given.

References in corpus (9)

• Fiber Fabry-Perot cavity with high finesse
• Characterization of high finesse mirrors: loss, phase shifts and mode structure in an optical cavity
• Ultrahigh finesse Fabry-Perot superconducting resonator
• An ultrastable silicon cavity in a continuously operating closed-cycle cryostat at 4 K
• QCL-based frequency metrology from the mid-infrared to the THz range: a review
• A compact, thermal noise limited reference cavity for ultra-low noise microwave generation
• Ultra-compact reference ULE cavity
• Waveguided Approach for Difference Frequency Generation of Broadly-Tunable Continuous-Wave Terahertz Radiation
• Room-Temperature Continuous-Wave Frequency-Referenced Spectrometer up to 7.5 THz