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The Wave Comb Acupressure Tool for Pain Management and Anxiety

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Miri, M.-A., D’Aguanno, G. & Alú, A. Optomechanical frequency combs. N. J. Phys. 20, 043013 (2018). Yin, L., Lin, Q. & Agrawal, G. P. Soliton fission and supercontinuum generation in silicon waveguides. Opt. Lett. 32, 391–393 (2007). Bartalini, S. et al. Frequency-comb-assisted terahertz quantum cascade laser spectroscopy. Phys. Rev. X 4, 1–7 (2014). In Fig. 3d, e, we observe the membrane motion from the thermal state at t< 5 s to the steady state of the comb at t> 33 s. Initially, we detect only the fundamental mode ω 0, until the resonator starts crossing multiple optical extrema. Higher overtones appear as the maximum displacement grows. In contrast to Fig. 2a, the fundamental mode is the most powerful. The detection efficiency likely varies for each overtone due to its shape 47. The displacement stops growing at t ≃ 26 s, and decreases slightly before the system reaches a steady state (see Supplementary section H). It is likely limited in amplitude by a mechanical non-linearity, but the amplitude overshoot and the oscillation of amplitude of overtones suggest that the interaction with the optical field plays a role. In the steady state, the fractional frequency stability of the 30th overtone is 7.5 ⋅ 10 −10 over a 6-h period (Supplementary section H), limited by thermal drifts. The frequency of the overtones is determined solely by the mechanical frequency, and is thus not affected by drifts in the laser frequency. Changes in the laser power will affect the overtone amplitudes, mainly via the optothermal parametric driving. The uniformity of the comb is not affected by mechanical frequency shifts (nor by the laser), thus uniformity is constant. Newbury, N. R. Searching for applications with a fine-tooth comb. Nat. Photonics 5, 186–188 (2011).

Wu, D. et al. Four-wave mixing-based wavelength conversion and parametric amplification in submicron silicon core fibers. IEEE J. Sel. Top. Quantum Electron. 27, 1–11 (2020). The Wave Comb may disclose your Personal Data in the good faith belief that such action is necessary to:Koenig, S. et al. Wireless sub-THz communication system with high data rate. Nat. Photon 7, 977–981 (2013). Nakamura, K., Okubo, S., Schramm, M., Kashiwagi, K. & Inaba, H. Offset-free all-fiber frequency comb with an acousto-optic modulator and two f –2 f interferometers. Appl. Phys. Express 10, 072501 (2017). Katayama, K. et al. A 300 GHz CMOS transmitter with 32-QAM 17.5 Gb/s/ch capability over six channels. IEEE J. Solid-State Circuits 51, 3037–3048 (2016). Wu, S. et al. Hybridized frequency combs in multimode cavity electromechanical system. Phys. Rev. Lett. 128, 153901 (2022).

Wu, R., Supradeepa, V., Long, C. M., Leaird, D. E. & Weiner, A. M. Generation of very flat optical frequency combs from continuous-wave lasers using cascaded intensity and phase modulators driven by tailored radio frequency waveforms. Opt. Lett. 35, 3234–3236 (2010). Li, J., Yi, X., Lee, H., Diddams, S. A. & Vahala, K. J. Electro-optical frequency division and stable microwave synthesis. Science 345, 309–313 (2014). Batista, A. A. & Lisboa de Souza, A. A. Frequency-comb response of a parametrically driven Duffing oscillator to a small added ac excitation. J. Appl. Phys. 128, 244901 (2020). Cao, L. S., Qi, D. X., Peng, R. W., Wang, M. & Schmelcher, P. Phononic frequency combs through nonlinear resonances. Phys. Rev. Lett. 112, 075505 (2014). Starting with intense light at two or more equally spaced frequencies, this process can generate light at more and more different equally spaced frequencies. For example, if there are a lot of photons at two frequencies f 1 , f 2 {\displaystyle f_{1},f_{2}} , four-wave mixing could generate light at the new frequency 2 f 1 − f 2 {\displaystyle 2f_{1}-f_{2}} . This new frequency would get gradually more intense, and light can subsequently cascade to more and more new frequencies on the same comb.

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Pelusi, M. D. et al. Applications of highly-nonlinear chalcogenide glass devices tailored for high-speed all-optical signal processing. IEEE J. Sel. Top. Quantum Electron. 14, 529–539 (2008). One theory that helps explain the effectiveness of acupressure in pain relief during labour is the gate control theory. This theory suggests that pain signals must pass through a "gate" in the spinal cord before reaching the brain. By applying pressure to specific points on the palm and the body, such as with The Wave Comb, it is believed that the gate can be closed, preventing the pain signals from reaching the brain.

Mohandas, R. A. et al. Exact frequency and phase control of a terahertz laser. Optica 7, 1143–1149 (2020). The frequency domain representation of a perfect frequency comb is like a Dirac comb, a series of delta functions spaced according to The as-drawn SCFs are fabricated using the molten core fibre drawing (MCD) technique. This process uses a standard fibre drawing tower to heat and melt the silicon core that is surrounded by a softened silica cladding (drawing temperature of 1950 °C), which acts as a crucible to retain the fibre profile as it is drawn down, as detailed in ref. 50. A thin layer of calcium oxide is included as an interfacial barrier between the core and cladding during the drawing process, which limits dissolution of silica from the cladding into the silicon core and reduces the thermal strain arising from high-temperature processing. The as-drawn SCFs have a poly-crystalline core material with uniform core/cladding diameters of 12 μm/125 μm. To improve the crystalline quality and reduce the losses of the as-drawn fibres, we insert the original SCFs into a silica capillary (400 μm/150 μm inner/outer diameter) and taper this down to have core/cladding diameters of about 5 μm/125 μm. The fabrication is realised using a glass processing system (Vytran GPX-3400-V4), which is widely accessible for heat-polishing, tapering and splicing. Kittlaus, E. A. et al. A low-noise photonic heterodyne synthesizer and its application to millimeter-wave radar. Nat. Commun. 12, 1–10 (2021). In a different regime of breakthrough physics, optical trapping has allowed us to manipulate and control small particles ranging from single atoms 36, 37 to micrometers 38 in size. These particles are confined by the potential created by a strongly focused laser, which has enabled the exploration of cutting-edge fields in both fundamental physics and biology. Using optical traps (tweezers), biologists can precisely manipulate anything from single strands of DNA 39 to whole living cells 40. Optically trapped ultra-cold atoms and levitated nanoparticles are perfect testbeds for fundamental physics involving gravity and mesoscopic quantum mechanics 41, 42, 43. Although optical trapping and frequency combs are widespread techniques, there is little direct overlap between these regimes of physics.Kobayashi, T.; Sueta, T.; Cho, Y.; Matsuo, Y. (1972-10-15). "High‐repetition‐rate optical pulse generator using a Fabry‐Perot electro‐optic modulator". Applied Physics Letters. 21 (8): 341–343. Bibcode: 1972ApPhL..21..341K. doi: 10.1063/1.1654403. ISSN 0003-6951. Guccione, G. et al. Scattering-free optical levitation of a cavity mirror. Phys. Rev. Lett. 111, 183001 (2013). Nagatsuma, T. et al. Millimeter-wave and terahertz-wave applications enabled by photonics. IEEE J. Quantum Electron. 52, 0600912 (2015).

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