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  1. Article ; Online: Femtosecond laser assisted selective etching of microchannels in lithium niobate.

    Nwatu, Daniel / Kip, Detlef / Hasse, Kore

    Optics express

    2023  Volume 31, Issue 23, Page(s) 37618–37629

    Abstract: Here, we report on the fabrication of cm-long microchannels in ... ...

    Abstract Here, we report on the fabrication of cm-long microchannels in LiNbO
    Language English
    Publishing date 2023-11-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.500439
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  2. Article ; Online: Coupled Electron-Nuclear Dynamics Induced and Monitored with Femtosecond Soft X-ray Pulses in the Amino Acid Glycine.

    Schwickert, David / Przystawik, Andreas / Diaman, Dian / Kip, Detlef / Marangos, Jon P / Laarmann, Tim

    The journal of physical chemistry. A

    2024  Volume 128, Issue 6, Page(s) 989–995

    Abstract: The coupling of electronic and nuclear motion in polyatomic molecules is at the heart of attochemistry. The molecular properties, transient structures, and reaction mechanism of these many-body quantum objects are defined on the level of electrons and ... ...

    Abstract The coupling of electronic and nuclear motion in polyatomic molecules is at the heart of attochemistry. The molecular properties, transient structures, and reaction mechanism of these many-body quantum objects are defined on the level of electrons and ions by molecular wave functions and their coherent superposition, respectively. In the present contribution, we monitor nonadiabatic quantum wave packet dynamics during molecular charge motion by reconstructing both the oscillatory charge density distribution and the characteristic time-dependent nuclear configuration coordinate from time-resolved Auger electron spectroscopic data recorded in previous studies on glycine molecules [Schwickert et al.
    Language English
    Publishing date 2024-02-05
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5215
    ISSN (online) 1520-5215
    DOI 10.1021/acs.jpca.3c06517
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Engineering topological interface states in metal-wire waveguides for broadband terahertz signal processing.

    Ghazialsharif, Mohammad / Dong, Junliang / Bongiovanni, Domenico / Vorobiov, Anton / Wang, Ziteng / Chen, Zhigang / Kip, Detlef / Morandotti, Roberto

    Nanophotonics

    2024  Volume 13, Issue 10, Page(s) 1929–1937

    Abstract: Innovative terahertz waveguides are in high demand to serve as a versatile platform for transporting and manipulating terahertz signals for the full deployment of future six-generation (6G) communication systems. Metal-wire waveguides have emerged as ... ...

    Abstract Innovative terahertz waveguides are in high demand to serve as a versatile platform for transporting and manipulating terahertz signals for the full deployment of future six-generation (6G) communication systems. Metal-wire waveguides have emerged as promising candidates, offering the crucial advantage of sustaining low-loss and low-dispersion propagation of broadband terahertz pulses. Recent advances have opened up new avenues for implementing signal-processing functionalities within metal-wire waveguides by directly engraving grooves along the wire surfaces. However, the challenge remains to design novel groove structures to unlock unprecedented signal-processing functionalities. In this study, we report a plasmonic signal processor by engineering topological interface states within a terahertz two-wire waveguide. We construct the interface by connecting two multiscale groove structures with distinct topological invariants, i.e., featuring a π-shift difference in the Zak phases. The existence of this topological interface within the waveguide is experimentally validated by investigating the transmission spectrum, revealing a prominent transmission peak in the center of the topological bandgap. Remarkably, we show that this resonance is highly robust against structural disorders, and its quality factor can be flexibly controlled. This unique feature not only facilitates essential functions such as band filtering and isolating but also promises to serve as a linear differential equation solver. Our approach paves the way for the development of new-generation all-optical analog signal processors tailored for future terahertz networks, featuring remarkable structural simplicity, ultrafast processing speeds, as well as highly reliable performance.
    Language English
    Publishing date 2024-04-15
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2674162-3
    ISSN 2192-8614 ; 2192-8606
    ISSN (online) 2192-8614
    ISSN 2192-8606
    DOI 10.1515/nanoph-2023-0900
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  4. Article ; Online: Multiplexing temperature-compensated open-cavity Fabry-Perot sensors at a fiber tip.

    Pfalzgraf, Ivonne / Suntsov, Sergiy / Kip, Detlef

    Applied optics

    2021  Volume 60, Issue 33, Page(s) 10402–10408

    Abstract: We investigate multiplexing of four highly sensitive Fabry-Perot (FP) microresonators at the tip of a single-mode optical fiber for refractive index (RI) measurements with simultaneous temperature compensation. The individual sensing elements for RI or ... ...

    Abstract We investigate multiplexing of four highly sensitive Fabry-Perot (FP) microresonators at the tip of a single-mode optical fiber for refractive index (RI) measurements with simultaneous temperature compensation. The individual sensing elements for RI or temperature consist of either open-cavity FP resonators or solid fiber core regions fabricated by diamond-blade dicing of single-mode optical fibers, respectively. The reflectivity of the open resonators is further enhanced by matched dielectric coatings. At the same time, the solid core resonators formed by the fiber pieces between the open cavities are used as thermometers. This allows immediate compensation for temperature cross-sensitivity during RI measurements. The general performance of the sensor is demonstrated by measuring the RI of sucrose solutions, where we use phase tracking of the characteristic Fourier transform components of the backreflected optical spectrum for evaluation. The temperature sensitivity is on average 20±/
    Language English
    Publishing date 2021-11-11
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4522
    ISSN (online) 1539-4522
    DOI 10.1364/AO.438565
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Fiber-optic sensor measuring spatial distributions of refractive index and temperature.

    Pfalzgraf, Ivonne / Suntsov, Sergiy / Kip, Detlef

    Applied optics

    2021  Volume 60, Issue 5, Page(s) 1428–1433

    Abstract: In this work, we present a fiber sensor designed to measure simultaneously spatial inhomogeneities of the refractive index and temperature in liquid media, for example, induced by biochemical reactions. The sensor's constituent elements are Fabry-Perot ... ...

    Abstract In this work, we present a fiber sensor designed to measure simultaneously spatial inhomogeneities of the refractive index and temperature in liquid media, for example, induced by biochemical reactions. The sensor's constituent elements are Fabry-Perot microresonators fabricated in standard single-mode optical fibers by diamond blade dicing. To allow simultaneous measurements of different refractive indices, the sensor comprises two open cavities approximately 2 mm apart. With a small Si inlay inserted into one of the resonators used for temperature measurements, the sensor allows for immediate compensation of crosstalk between temperature- and composition-induced fluids' refractive index changes. The measurements were evaluated by phase tracking of the characteristic Fourier transform components of the sensor's backreflected spectra. The temperature sensitivity of the Si inlay is 0.063 rad/°C (79 pm/°C), and an accuracy of 0.01°C is obtained. Meanwhile, the two refractive index sensing (open) cavities show a sensitivity of 1168 and 1153 nm/RIU for temperature-compensated measurements. Finally, the sensor performance to measure spatial distributions is demonstrated by measuring the diffusion behavior of sucrose in water, which allows precise monitoring of hydration effects and breaking of bonds at elevated temperatures.
    Language English
    Publishing date 2021-03-09
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4522
    ISSN (online) 1539-4522
    DOI 10.1364/AO.416630
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Watt-level 775 nm SHG with 70% conversion efficiency and 97% pump depletion in annealed/reverse proton exchanged diced PPLN ridge waveguides.

    Suntsov, Sergiy / Rüter, Christian E / Brüske, Dominik / Kip, Detlef

    Optics express

    2021  Volume 29, Issue 8, Page(s) 11386–11393

    Abstract: We report on fabrication of ridge waveguides formed in congruent periodically poled lithium niobate substrates using annealed and reverse proton exchange followed by diamond blade dicing. 1 W of second-harmonic generation at 775 nm has been obtained in a ...

    Abstract We report on fabrication of ridge waveguides formed in congruent periodically poled lithium niobate substrates using annealed and reverse proton exchange followed by diamond blade dicing. 1 W of second-harmonic generation at 775 nm has been obtained in a single-pass in 50 mm long ridge waveguides with internal conversion efficiency of 70%. At this power level, 97% pump depletion has been reached. Although elevated temperature operation and ridge geometry help to mitigate photorefractive damage (PRD) effects, nevertheless, at even higher second harmonic outputs significant power drop with blue shift and distortion of the SHG tuning curve have been observed indicating an onset of PRD.
    Language English
    Publishing date 2021-02-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.416723
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Dual parameter fiber-integrated sensor for refractive index and temperature measurement based on Fabry-Perot micro-resonators.

    Suntsov, Sergiy / Rüter, Christian E / Kip, Detlef

    Applied optics

    2019  Volume 58, Issue 8, Page(s) 2076–2080

    Abstract: We report on a miniature all-fiber dual parameter sensor capable of simultaneous measurement of the refractive index (RI) and temperature of fluids and gases. The high-sensitivity sensing element is comprised of two Fabry-Perot (FP) micro-resonators ... ...

    Abstract We report on a miniature all-fiber dual parameter sensor capable of simultaneous measurement of the refractive index (RI) and temperature of fluids and gases. The high-sensitivity sensing element is comprised of two Fabry-Perot (FP) micro-resonators fabricated in a single-mode fiber and has a total length of <100  μm. The RI sensing cavity is formed by diamond blade dicing, whereas a thinner silicon inlay glued into it serves as a temperature sensor. The sensor's performance was tested on sucrose solutions over a range of temperatures. For the evaluation of the backreflected FP spectra, phase tracking of the characteristic Fourier transform components was used. Good accuracy (0.01°C) and linearity of temperature measurement with Si inlay with sensitivity 0.097 rad/°C (85.2 pm/°C) were found, whereas the open cavity allowed for reliable temperature-compensated measurements of 10
    Language English
    Publishing date 2019-03-15
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4522
    ISSN (online) 1539-4522
    DOI 10.1364/AO.58.002076
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  8. Article ; Online: Efficient Nd:Ti:LiNbO

    Brüske, Dominik / Suntsov, Sergiy / Rüter, Christian E / Kip, Detlef

    Optics express

    2019  Volume 27, Issue 6, Page(s) 8884–8889

    Abstract: In this work, we report on efficient neodymium-doped titanium in-diffused ridge waveguide lasers in x-cut congruent ... ...

    Abstract In this work, we report on efficient neodymium-doped titanium in-diffused ridge waveguide lasers in x-cut congruent LiNbO
    Language English
    Publishing date 2019-05-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.27.008884
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  9. Book ; Online: High-power intracavity single-cycle THz pulse generation using thin lithium niobate

    Wang, Yicheng / Vogel, Tim / Khalili, Mohsen / Mansourzadeh, Samira / Hasse, Kore / Suntsov, Sergiy / Kip, Detlef / Saraceno, Clara J.

    2023  

    Abstract: Ultrafast laser driven, single-cycle THz pulsed sources hold immense potential for scientific and industrial applications; however, their limited average power hinders their widespread application. In particular, applications where high repetition rates ... ...

    Abstract Ultrafast laser driven, single-cycle THz pulsed sources hold immense potential for scientific and industrial applications; however, their limited average power hinders their widespread application. In particular, applications where high repetition rates in the multi-MHz region and beyond are required are more severely affected, due to the lower pulse energies available for frequency conversion. In this respect, resonant enhancement both in passive and active resonators is a well-known technique for boosting the efficiency of nonlinear frequency conversion; however, this route has remained poorly explored for the generation of broadband THz pulses due to the inadequacy of typically employed nonlinear crystals. Here, we demonstrate that thin lithium niobate crystals used intracavity of multimode diode-pumped mode-locked thin-disk lasers are a promising platform to circumvent these difficulties. Using a 50-{\mu}m thin lithium niobate plate intracavity of a compact high-power mode-locked thin-disk laser, we generate milliwatt-level broadband THz pulses with a spectrum extending up to 3 THz at 44.8 MHz repetition rate, driven by 264 W of intracavity average power. This approach opens the door to efficient high-power single-cycle THz generation using affordable nonlinear crystals at very high repetition rates, scalable to kilowatt-level driving power with low cost and complexity.
    Keywords Physics - Optics
    Subject code 621
    Publishing date 2023-09-08
    Publishing country us
    Document type Book ; Online
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  10. Article ; Online: Rb/Ba side-diffused ridge waveguides in KTP.

    Volk, Martin F / Rüter, Christian E / Kip, Detlef

    Optics express

    2017  Volume 25, Issue 17, Page(s) 19872–19877

    Abstract: We report on characterization of ridge waveguides fabricated in KTP ( ... ...

    Abstract We report on characterization of ridge waveguides fabricated in KTP (KTiOPO
    Language English
    Publishing date 2017-08-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.25.019872
    Database MEDical Literature Analysis and Retrieval System OnLINE

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