High spectral purity chip-scale tunable THz generation

POSTER

Abstract

High-Q nonlinear integrated resonators have emerged as a new platform which has been revolutionizing many fields in contexts such as optical frequency comb, laser spectroscopy and quantum-entangled sources. In this talk, we present the generation of tunable THz radiation with high spectral purity and broad frequency tunability. Mode splitting strength and position can be changed by controlling the pump-resonance effective detuning in a dispersion-managed Si3N4 microresonator through a differential thermo-optic effect. Therefore, tunable optical parametric oscillation can be observed by tuning pump-resonance detuning. A broadly tunable THz radiation from 0.3 THz to over 2.5 THz is generated after injecting the tunable parametric oscillation into a bias-free photomixer at room temperature. By feedback controlling the intracavity power of the microresonator, the radiated THz signal can provide a sub-Hz linewidth. Active intracavity power stabilization improves the long-term frequency stability by eight orders of magnitude reaching a record instrument-limited frequency residual instability of 6×10-15 in 1 second. The demonstrated chip scale tunable THz generation with high spectral purity can be used for frequency-domain THz spectroscopy.

Presenters

  • wenting wang

    • Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles
    • University of California, Los Angeles

Authors

  • wenting wang

    • Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles
    • University of California, Los Angeles

  • Ping-Keng Lu

    • University of California, Los Angeles

  • Abhinav Kumar Vinod

    • Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles
    • UCLA Foundation
    • University of California, Los Angeles

  • James McMillan

    • University of California, Los Angeles

  • mingbin yu

    • State key lab of functional materials for informatics

  • Dim-Lee Kwong

    • A*STAR institute of microelectronics

  • Mona Jarrahi

    • University of California, Los Angeles
    • Electrical and Computer Engineering, University of California, Los Angeles

  • Chee Wei Wong

    • Electrical & Computer Engineering and Center for Quantum Science & Engineering, University of California, Los Angeles
    • Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles
    • University of California, Los Angeles
    • University of California Los Angeles
    • UCLA Foundation