Optical nanofiber temperature monitoring via double heterodyne detection
arXiv:1803.02258 · doi:10.1063/1.5027743
Abstract
Tapered optical fibers (nanofibers) whose diameters are smaller than the optical wavelength are very fragile and can be easily destroyed if excessively heated by energy dissipated from the transmitted light. We present a technique for monitoring the nanofiber temperature using two-stage heterodyne detection. The phase of the heterodyne output signal is determined by that of the transmitted optical field, which, in turn, depends on the temperature through the refractive index. From the phase data, by numerically solving the heat exchange equations, the temperature distribution along the nanofiber is determined. The technique is applied to the controlled heating of the nanofiber by a laser in order to remove rubidium atoms adsorbed on its surface that substantially degrade its transmission. Almost 90% of the nanofiber's original transmission is recovered.
References in corpus (12)
- The Quantum Internet
- Surface Electromagnetic Waves Thermally Excited: Radiative Heat Transfer, Coherence Properties and Casimir Forces Revisited in the Near Field
- Optical interface created by laser-cooled atoms trapped in the evanescent field surrounding an optical nanofiber
- Ultrahigh Transmission Optical Nanofibers
- Optical Micro- and Nanofiber Pulling Rig
- Versatile Wideband Balanced Detector for Quantum Optical Homodyne Tomography
- A balanced homodyne detector for high-rate Gaussian-modulated coherent-state quantum key distribution
- Heat radiation from long cylindrical objects
- Optical transmittance degradation in tapered fibers
- Thermalization via Heat Radiation of an Individual Object Thinner than the Thermal Wavelength
- Noise spectra in balanced optical detectors based on transimpedance amplifiers
- Transmission degradation and preservation for tapered optical fibers in rubidium vapor