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  • Optica Publishing Group  (23)
  • 1
    Online Resource
    Online Resource
    Two-photon 3D printed spring-based Fabry–Pérot cavity resonator for acoustic wave detection and imaging
    Optica Publishing Group ; 2023
    In:  Photonics Research Vol. 11, No. 5 ( 2023-05-01), p. 780-
    Details
    In: Photonics Research, Optica Publishing Group, Vol. 11, No. 5 ( 2023-05-01), p. 780-
    Abstract: Optical fiber microresonators have attracted considerable interest for acoustic detection because of their compact size and high optical quality. Here, we have proposed, designed, and fabricated a spring-based Fabry–Pérot cavity microresonator for highly sensitive acoustic detection. We observed two resonator vibration modes: one relating to the spring vibration state and the other determined by the point-clamped circular plate vibration mode. We found that the vibration modes can be coupled and optimized by changing the structure size. The proposed resonator is directly 3D printed on an optical fiber tip through two-photon polymerization and is used for acoustic detection and imaging. The experiments show that the device exhibits a high sensitivity and low noise equivalent acoustic signal level of 2.39   mPa / Hz 1/2 at 75 kHz that can detect weak acoustic waves, which can be used for underwater object imaging. The results demonstrate that the proposed work has great potential in acoustic detection and biomedical imaging applications.
    Type of Medium: Online Resource
    ISSN: 2327-9125
    URL: Article
    DOI: 10.1364/PRJ.481858
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    detail.hit.zdb_id: 2724783-1
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  • 2
    Online Resource
    Online Resource
    Disordered mullite grains in a sapphire-derived fiber for high-temperature sensing
    Optica Publishing Group ; 2022
    In:  Optics Express Vol. 30, No. 10 ( 2022-05-09), p. 16606-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 30, No. 10 ( 2022-05-09), p. 16606-
    Abstract: In this study, a sapphire-derived fiber (SDF)-based Fabry-Pérot interferometer (FPI) is proposed and experimentally demonstrated as a high-temperature sensor using the arc discharge crystallization process, forming a region with disordered mullite grains. This shows that the disordered mullite grains are related to the gradual temperature distribution during the arc discharge process, which results in a larger refractive index (RI) modulation of the SDF near the fusing area, forming a reflection mirror. An FPI was obtained by combining the optical fiber end facet. Considering the high-temperature resistance of the fiber, the fabricated FPI was used for high-temperature sensing. This shows that the device can operate at temperatures of up to 1200 °C with a sensitivity of 15.47 pm/°C, demonstrating that the proposed devices have potential applications in high-temperature environments.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.453881
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 1491859-6
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  • 3
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    Online Resource
    Compound Fabry–Pérot interferometer for simultaneous high-pressure and high-temperature measurement
    Optica Publishing Group ; 2021
    In:  Optics Express Vol. 29, No. 15 ( 2021-07-19), p. 24289-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 29, No. 15 ( 2021-07-19), p. 24289-
    Abstract: We have proposed and experimentally demonstrated a sapphire-derived fiber (SDF) and silica capillary-based compound Fabry-Pérot interferometer (FPI) for high-pressure and high-temperature sensing. The SDF owns high alumina dopant concentration core, which can generate a mullite crystallization region during an arc discharge process. The crystallization region acts as a reflective interface to form one FPI in the SDF. The other FPI contains an air cavity constructed by the silica capillary and is used for high-pressure sensing. Both gas pressure within a range from 0 MPa to 4 MPa and temperature within a range from 20°C to 700°C are measured. Experimental results show that the wavelength shift of the FPI versus the applied pressure is linear at each tested temperature. The pressure sensitivity is measured to be 5.19 nm/MPa at a high temperature of 700°C, and the linear responses show excellent repeatability with linearity of 0.999. Meanwhile, the proposed FPI can stably function at a high temperature of 700°C with a temperature sensitivity of 0.013 nm/°C. The proposed FPI sensor provides a promising candidate for simultaneous measurement of high pressure and high temperature in extreme conditions.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.425811
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
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  • 4
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    Online Resource
    Design of a high extinction ratio silicon optical modulator at 2 µm using the cascaded compensation method
    Optica Publishing Group ; 2021
    In:  OSA Continuum Vol. 4, No. 7 ( 2021-07-15), p. 1933-
    Details
    In: OSA Continuum, Optica Publishing Group, Vol. 4, No. 7 ( 2021-07-15), p. 1933-
    Abstract: The effect of the free carrier effect is more significant in the mid-infrared band when compared with the 1310 band and 1550 band. In this paper, we propose a cascaded Mach-Zehnder interference (MZI) structure to improve the extinction ratio (ER) of the modulator in the mid-infrared band. The cascaded compensation method is to add the next-stage equal-arm MZI device to the two phase shifters of the major MZI. The output light intensity of the two phase shifters can be maintained at the same level by adjusting the output loss of both the equal-arm MZI. With the cascaded compensation method, the simulated ER of the optical modulator is increased from 36 dB to 55 dB under −4 V bias while the device still maintains a low insertion loss (IL) of 12.5 dB. Through the cascaded compensation method, the modulation depth of the modulator at −2 V, −4 V, −6 V, and −8 V are 58 dB, 53 dB, 57 dB, and 59 dB, respectively. Meanwhile, the dynamic ER is 9.2 dB at a data rate of 40 Gbps, which is 4.5 dB higher than that of the original one.
    Type of Medium: Online Resource
    ISSN: 2578-7519
    URL: Article
    DOI: 10.1364/OSAC.426592
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    detail.hit.zdb_id: 2944048-8
    detail.hit.zdb_id: 3143831-3
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  • 5
    Online Resource
    Online Resource
    Microbubble-based optical fiber Fabry-Perot sensor for simultaneous high-pressure and high-temperature sensing
    Optica Publishing Group ; 2022
    In:  Optics Express Vol. 30, No. 19 ( 2022-09-12), p. 33639-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 30, No. 19 ( 2022-09-12), p. 33639-
    Abstract: An all-silica Fabry-Perot interferometer (FPI) based on a microbubble for high-pressure and high-temperature measurements is proposed and demonstrated. The microbubble-based air cavity is fabricated using a hollow silica tube and a single-mode optical fiber for pressure sensing. The suitable thickness between the two end faces of the microbubble enables the silica cavity to be used for temperature sensing. The wavelength shift of the reflection spectrum versus pressure is linear, and the sensitivity reaches −5.083 nm/MPa at room temperature (20 °C) within the range of 0 − 4 MPa. The temperature sensitivity reaches 12.715 pm/°C within the range of 20 − 700 °C. The very low temperature-pressure cross-sensitivity of the two cavities indicates that the proposed FPI sensor offers great potential for simultaneous high-pressure and high-temperature measurements in harsh environments.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.465315
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 1491859-6
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  • 6
    Online Resource
    Online Resource
    Two-photon 3D printing diaphragm-integrated ring waveguide coupler for ultrasound detection
    Optica Publishing Group ; 2023
    In:  Optics Letters Vol. 48, No. 16 ( 2023-08-15), p. 4412-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 48, No. 16 ( 2023-08-15), p. 4412-
    Abstract: We demonstrate a diaphragm-integrated ring waveguide coupler fabricated by the two-photon direct laser wring technique as an ultrasonic sensor, which is integrated on an optical fiber tip. The device consists of a micro-ring waveguide with a diameter of 5 µm functionalized as an optical fiber tip light reflection mirror and a straight waveguide connecting a diaphragm. The evanescent field coupling can be realized between the two waveguides, and the coupling efficiency can be changed due to the variation of the coupling gap induced by ultrasound. Accordingly, the light reflection can be changed. Based on the plate vibration theory, the vibration frequency can be changed through optimizing the diaphragm size. The experiments show that the device exhibits a high sensitivity and low noise equivalent acoustic signal level of 1.07 mPa/Hz 1/2 at 100 kHz, which has great potential in various acoustic wave sensing applications.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.500428
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    detail.hit.zdb_id: 243290-0
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  • 7
    Online Resource
    Online Resource
    Reaching fiber-laser coherence in integrated photonics
    Optica Publishing Group ; 2021
    In:  Optics Letters Vol. 46, No. 20 ( 2021-10-15), p. 5201-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 46, No. 20 ( 2021-10-15), p. 5201-
    Abstract: We self-injection-lock a diode laser to a 1.41 m long, ultra-high Q integrated resonator. The hybrid integrated laser reaches a frequency noise floor of 0.006 H z 2 / H z at 4 MHz offset, corresponding to a Lorentzian linewidth below 40 mHz—a record among semiconductor lasers. It also exhibits exceptional stability at low-offset frequencies, with frequency noise of 200 H z 2 / H z at 100 Hz offset. Such performance, realized in a system comprised entirely of integrated photonic chips, marks a milestone in the development of integrated photonics; and, for the first time, to the best of our knowledge, exceeds the frequency noise performance of commercially available, high-performance fiber lasers.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.439720
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
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  • 8
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    Online Resource
    Brillouin backaction thermometry for modal temperature control
    Optica Publishing Group ; 2022
    In:  Optica Vol. 9, No. 7 ( 2022-07-20), p. 701-
    Details
    In: Optica, Optica Publishing Group, Vol. 9, No. 7 ( 2022-07-20), p. 701-
    Abstract: Stimulated Brillouin scattering provides optical gain for efficient and narrow-linewidth lasers in high-Q microresonator systems. However, the thermal dependence of the Brillouin process as well as the microresonator frequencies impose strict temperature control requirements for long term frequency-stable operation. Here, we study Brillouin backaction and use it to both measure and phase-sensitively lock modal temperature to a reference temperature defined by the Brillouin phase matching condition. At a specific lasing wavelength, the reference temperature can be precisely set by adjusting the resonator’s free spectral range. This backaction control method is demonstrated in a chip-based Brillouin laser, but can be applied in all Brillouin laser platforms. It offers a new approach for frequency-stable operation of Brillouin lasers in atomic clock, frequency metrology, and gyroscope applications.
    Type of Medium: Online Resource
    ISSN: 2334-2536
    URL: Article
    DOI: 10.1364/OPTICA.459082
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 2779175-0
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  • 9
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    Online Resource
    Engineered zero-dispersion microcombs using CMOS-ready photonics
    Optica Publishing Group ; 2023
    In:  Optica Vol. 10, No. 2 ( 2023-02-20), p. 279-
    Details
    In: Optica, Optica Publishing Group, Vol. 10, No. 2 ( 2023-02-20), p. 279-
    Abstract: Normal group velocity dispersion (GVD) microcombs offer high comb line power and high pumping efficiency compared to bright pulse microcombs. The recent demonstration of normal GVD microcombs using CMOS foundry-produced microresonators is an important step toward scalable production. However, the chromatic dispersion of CMOS devices is large and impairs the generation of broadband microcombs. Here, we report the development of a microresonator in which GVD is reduced due to a coupled-ring resonator configuration. Operating in the turnkey self-injection locking mode, the resonator is integrated in a hybrid manner with a semiconductor laser pump to produce high-power efficiency combs spanning a bandwidth of 9.9 nm (1.22 THz) centered at 1560 nm, corresponding to 62 comb lines. Fast, linear optical sampling of the comb waveform is used to observe the rich set of near-zero GVD comb behaviors, including soliton molecules, switching waves (platicons), and their hybrids. Tuning of the 20 GHz repetition rate by electrical actuation enables servo locking to a microwave reference, which simultaneously stabilizes the comb repetition rate, offset frequency, and temporal waveform. This integrated hybrid system could be used in coherent communications or for ultrastable microwave signal generation by two-point optical frequency division.
    Type of Medium: Online Resource
    ISSN: 2334-2536
    URL: Article
    DOI: 10.1364/OPTICA.478710
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
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  • 10
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    Online Resource
    Self-starting bi-chromatic LiNbO 3 soliton microcomb
    Optica Publishing Group ; 2019
    In:  Optica Vol. 6, No. 9 ( 2019-09-20), p. 1138-
    Details
    In: Optica, Optica Publishing Group, Vol. 6, No. 9 ( 2019-09-20), p. 1138-
    Type of Medium: Online Resource
    ISSN: 2334-2536
    URL: Article
    DOI: 10.1364/OPTICA.6.001138
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2019
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