Millimeter-wave signal generation device based on difference frequency generation in a LiTaO3 rectangular waveguide
We have proposed a new DFG-based signal generation device in a LiTaO3 rectangular waveguide. 15 GHz signal was successfully generated from the fabricated device. In this paper, its application for higher-frequency signal generation is discussed.
Travelling-wave electro-optic modulators with arbitrary frequency response utilising non-periodic polarisation reversal
A new design to realise travelling-wave electro-optic modulators, which utilise a non-periodically polarisation-reversed structure to produce an arbitrary frequency response, is proposed. A flat and broadband electro-optic modulator compensated for both velocity mismatch and degradation by microwave loss is presented.
Spectroscopic detection of methane by use of guided-wave diode-pumped difference-frequency generation.
We report spectroscopic gas detection by the use of mid-infrared difference-frequency mixing of two diode lasers in a channel waveguide. The waveguide was fabricated by annealed proton exchange in periodically poled lithium niobate. We generated 3.43-3.73-microm tunable radiation in a single waveguide at room temperature by mixing diode lasers near 780 and 1010 nm. High-resolution spectra of methane were obtained in 2 s with electronically controlled frequency scans of 45 GHz. The use of highly efficient waveguide frequency converters pumped by fiber-coupled diode lasers will permit construction of compact, solid-state, room-temperature mid-infrared sources for use in trace-gas detection.