Article

Loss determination in microsphere resonators by phase-shift cavity ring-down measurements.

Department of Chemistry, Queen's University, Kingston, ON K7L 3N6, Canada.
Optics Express (Impact Factor: 3.53). 09/2008; 16(17):13158-67. DOI: 10.1364/OE.16.013158
Source: PubMed

ABSTRACT The optical loss of whispering gallery modes of resonantly excited microresonator spheres is determined by optical lifetime measurements. The phase-shift cavity ring-down technique is used to extract ring-down times and optical loss from the difference in amplitude modulation phase between the light entering the microresonator and light scattered from the microresonator. In addition, the phase lag of the light exiting the waveguide, which was used to couple light into the resonator, was measured. The intensity and phase measurements were fully described by a model that assumed interference of the cavity modes with the light propagating in the waveguide.

0 Followers
 · 
115 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: We report on an erbium-doped fiber ring laser using a glass microdisk as a narrow linewidth reflection mirror. The microdisk is made of optical fibers through simple fabrication steps and it has a measured Q-factor of 7.8 × 106. The fiber ring laser has a linewidth of less than 0.16 pm, wavelength stability of ±1.2 pm, and power stability of ±0.3 dB.
    IEEE Photonics Technology Letters 08/2012; 24(16):1396-1398. DOI:10.1109/LPT.2012.2204244 · 2.18 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Phase shift cavity ring down spectroscopy (PS-CRDS) in conjunction with microcavities provides a highly sensitive approach for sensing applications. However, there have been no complete and accurate analytical expressions demonstrated so far for PS-CRDS based upon measurement of the transmitted waveguide signal only in a microcavity–waveguide system. For determining the ring down time of a microcavity, currently researchers employ PS-CRDS measurements either at multiple modulation frequencies or in the Rayleigh backscattered regime in conjunction with PS-CRDS measurements in the transmission mode of a microcavity–waveguide system. Here, we develop analytical expressions for PS-CRDS in waveguide-coupled microcavities by utilizing the coupled mode theory. Our mathematical treatment allows us to determine the ring down time of a microcavity by measuring a signal in the transmission mode (waveguide signal) only. The derived equations are also validated numerically and experimentally. The present work will find wide applications in sensors and modulators based upon microcavities.
    Journal of the Optical Society of America B 02/2015; 32(2). DOI:10.1364/JOSAB.32.000355 · 1.81 Impact Factor

Preview

Download
3 Downloads
Available from