Material dispersion and Rayleigh scattering in glassy germanium dioxide, a substance with promising applications in low-loss optical fiber waveguides

Abstract

PACS 85.85.+j -Micro-and nano-electromechanical systems (MEMS/NEMS) and devices PACS 07.75.+h -Mass spectrometers PACS 03.67.-a -Quantum information Abstract -I establish the fundamental lower bound on the mass that can be measured with a nano-mechanical resonator in a given quantum state based on the fundamental quantum Cramér-Rao bound, and identify the quantum states which will allow the largest sensitivity for a given maximum energy. I show that with existing carbon nanotube resonators it should be possible in principle to measure a thousandth of the mass of an electron, and future improvements might allow to reach a regime where one can measure the relativistic change of mass due to absorption of a single photon, or the creation of a chemical bond.

Record power, ultra-broadband supercontinuum source based on highly GeO_2 doped silica fiber

“…Fiber was pumped by a simple source consisting of a seed laser diode delivering a 1.1 ns pulse width at a repetition frequency of 100 kHz with an average power of 5 mW, which was further amplified to 506 mW by an erbium-ytterbium doped fiber amplifier. Authors claimed a zero dispersion wavelength (ZDW) of 1.426 μm for a pure GeO 2 fiber, which is significantly shorter than the measured ZDW of 1.73-1.74 μm of GeO 2 glasses thanks to the strong waveguide contribution [20,21]. Nonetheless the result obtained by Yang et al is the best performance in terms of bandwidth from a GeO 2 doped fiber.…”

Origin of Rayleigh scattering and anomaly of elastic properties in vitreous and molten GeO2

“…However, the interest to it becomes more and more pronounced significant being caused by searching for materials for drawing fiber with smaller absorption losses in the middle IR range as compared to silica glass [1][2][3][4][5][6][7].…”

PbO–GeO2 rib waveguides for photonic applications

“…Another example that should be considered is the propagation loss of a Na 2 O-MgO-Al 2 O 3 -GeO 2 rib waveguide with height of 0.2 m and width of 12 m for multimode operation: 0.48 dB/cm for 1482 nm [28]. In this case the difference may be attributed to the fact that propagation losses for 633 nm are normally much higher than in the infrared region due to Rayleigh scattering [29]. As far as we are concerned there are no reports in the literature related to germanate rib waveguides for propagation at 633 nm.…”