We are proud to announce the launch of our new website, www.advr-inc.com. This exciting development reflects our ongoing commitment to enhancing customer engagement and delivering an exceptional online user experience.
The new website will play a crucial role in delivering valuable resources and support for researchers, industry professionals, and academics alike. AdvR continues to prioritize innovation in photonics and looks forward to leveraging its enhanced digital presence to engage with the global community and drive future success. The platform will also strengthen collaboration with Hawthorn Photonics Group partners Covesion and Radiantis, facilitating cross-selling opportunities and highlighting the combined capabilities of the group to provide comprehensive, integrated photonics solutions worldwide.
As a leading researcher and manufacturer of advanced frequency conversion solutions, we are renowned for delivering exceptional customer support within the photonics industry. This dedication has been further reinforced with the launch of this new site, which features an expanded Knowledge Hub. Visitors can access technical guides, white papers, and the latest academic research in photonics and frequency conversion, staying up to date with industry developments while gaining insight into AdvR technologies and the practical applications of our solutions.
“The launch of our new website reflects AdvR’s dedication to providing innovative photonics solutions and exceptional service to our customers,” said Dr. Anjul Loiacono, CEO of AdvR. “Our broad product portfolio and expertise in frequency conversion allow us to offer highly tailored solutions to meet complex experimental and industrial needs. Our new website showcases these capabilities and provides a platform for enhanced engagement with our customers and partners. As the photonics industry continues to evolve, AdvR remains committed to supporting cutting-edge applications such as quantum sensing, advanced imaging, and precision measurement, while delivering outstanding pre- and post-sales support.”
Continuous wave tunable laser from 616 nm to 637 nm based on a compact sum frequency generation setup
Ruizhe Gu, Dia Darwich, Germain Guiraud, Mathieu Chauvet, Coline Mahob, Christof Janssen, Giorgio Santarelli, and Adèle Hilico
Abstract
We report on a compact sum frequency generation (SFG) setup generating continuously tunable single-frequency visible radiation from 616 nm to 637 nm, starting from two tunable laser sources at 1 µm and 1.5 µm. We compare two types of crystals: periodically poled lithium niobate (PPLN) and periodically poled magnesium oxide-doped lithium niobate (PPMgOLN), both custom-made such that the tunability range is achieved via temperature control only. We achieve a Watt level of power over the entire tunability range in PPMgOLN, with a mode profile enabling 80% coupling efficiency in a single-mode fiber, limited by the IR sources’ tunability, while keeping the system easy to operate.
Synchronous mode-locking of solid-state lasers by difference frequency generation
O. B. Jensen, A. K. Hansen, M. Chi, and P. Tidemand-Lichtenberg
Abstract
This Letter introduces a novel, to the best of our knowledge, method for achieving mode-locking and synchronization of mode-locked output pulses from two lasers. The proposed technique leverages parametric gain from difference frequency generation. Specifically, a Nd:YAG laser is mode-locked by single-pass mode-locked pulses from a mode-locked Ti:sapphire laser using an intracavity nonlinear crystal. When the continuous-wave laser is not actively pumped, the system functions as a synchronously pumped optical parametric oscillator. This novel approach has the potential to enable new devices, especially for pump-probe applications or for generation of mode-locked pulses in spectral regions where conventional mode-locked devices are typically not available.
Unidirectional ring laser operation and tunable single-frequency emission using differential parametric gain
O. B. Jensen, M. Helmark, A. G. Urskov, and P. Tidemand-Lichtenberg
Abstract
In this Letter, a novel approach for unidirectional operation of a 1064 nm solid-state ring laser is demonstrated based on difference frequency mixing. Unidirectional operation is achieved exploiting the directional parametric gain from a single-pass diode laser, facilitated through a periodically poled LiNbO3 crystal. In addition to achieving unidirectional operation, the nonlinear process further enables the generation of single-frequency mid-infrared light. Using a single-pass tapered diode laser, tunable in the range from 780 to 815 nm, the generated mid-infrared signal covers the 2.9 to 3.5 µm range while optimizing the phase-match condition of the difference frequency generation process.
Open-path methane sensing via backscattered light in a nonlinear interferometer
Jinghan Dong, Weijie Nie, Arthur C. Cardoso, Haichen Zhou, Jingrui Zhang, John G. Rarity, Alex S. Clark
Abstract
Nonlinear interferometry has widespread applications in sensing, spectroscopy, and imaging. However, most implementations require highly reflective mirrors and precise optical alignment, drastically reducing their versatility and usability in outdoor applications. This work is based on stimulated parametric downconversion, demonstrating methane absorption spectroscopy in the mid-infrared (MIR) region by detecting near-infrared photons using a silicon-based CMOS camera. The MIR light, used to probe methane, is diffusely backscattered from a Lambertian surface, experiencing significant transmission loss. We implement a single-mode confocal illumination and collection scheme, using a two-lens system to mode-match the interfering beams to achieve background methane detection at a distance of 4.6 m under a 57 dB loss. Our method is also extended to real-world surfaces, such as glass, brushed metal, and a leaf, showing robust background methane sensing with various target materials.
AdvR’s capabilities in waveguide and bulk MgO:PPLN, PPLN, and PPKTP allow for a wide range of up-conversion and down-conversion interactions from the UV to MIR wavelengths.
AdvR’s MgO:PPLN, PPLN, and PPKTP waveguide and bulk-crystal free-space up-conversion solutions provide high-efficiency SHG and SFG. A broad range of materials, waveguide types, and custom crystal options enables optimal performance for specific interaction wavelengths and power requirements. These free space solutions ensure reliable, versatile frequency conversion for research and OEM applications.
AdvR’s MgO:PPLN, PPLN, and PPKTP bulk-crystal and waveguide chip free-space solutions deliver high efficiency wavelength conversion for DFG, OPO/OPG/OPA, and SPDC. With custom grating options and a wide range of materials and waveguide types, these modules provide reliable performance across a broad wavelength range. Available in both in-stock and fully customized configurations.
Spectral characterization of SPDC-based single-photon sources for quantum key distribution
Sabine Euler, Erik Fitzke, Oleg Nikiforov, Daniel Hofmann, Till Dolejsky & Thomas Walther
Abstract
In our laboratory, we employ two biphoton sources for quantum key distribution. The first is based on cw parametric down-conversion of photons at 404 nm in PPKTP waveguide chips, while the second is based on the pulsed parametric down-conversion of 775 nm photons in PPLN waveguides. The spectral characterization is important for the determination of certain side-channel attacks. A Hong-Ou-Mandel experiment employing the first photon source revealed a complex structure of the common Hong-Ou-Mandel dip. By measuring the spectra of the single photons at 808 nm, we were able to associate these structures to the superposition of different transverse modes of the pump photons in our waveguide chips. The pulsed source was characterized by means of single-photon spectra measured by a sensitive spectrum analyzer as well as dispersion-based measurements. Finally, we also describe Hong-Ou-Mandel experiments using the photons from the second source.
Photon Pair Source based on PPLN-Waveguides for Entangled Two-Photon Absorption
Tobias Bernd Gäbler, Patrick Hendra, Nitish Jain, Markus Gräfe
Abstract
Fluorescence excitation by absorption of entangled photon pairs offers benefits compared to classical imaging techniques, such as the attainment of higher signal levels at low excitation power while simultaneously mitigating phototoxicity. However, current entangled photon pair sources are unreliable for fluorescence detection. In order to address this limitation, there is a need for ultra-bright entangled photon pair sources. Among the potential solutions, sources utilizing nonlinear waveguides emerge as promising candidates to facilitate fluorescence excitation through entangled photons. In this paper, a source consisting of a periodically poled lithium niobate waveguide is developed and its key characteristics are analyzed. To demonstrate its suitability as key component for imaging experiments, the entangled two-photon absorption behavior of Cadmium Selenide Zinc Sulfide quantum dot solutions is experimentally investigated.
Bright, Waveguide-based Entanglement Sources for High-rate Quantum Networking
Catherine Lee, Nicholas D. Hardy, Neal W. Spellmeyer, Ryan P. Murphy, Matthew E. Grein, P. Ben Dixon, Don M. Boroson, and Scott A. Hamilton
Abstract
We designed and built two polarization entanglement sources optimized for high-rate quantum networking under pump power constraints. We demonstrated entanglement swapping between the sources.
Significance of heralding in spontaneous parametric down-conversion
Mark Bashkansky, Igor Vurgaftman, Andrew C. R. Pipino, and J. Reintjes
Abstract
Single photons exhibit nonclassical, counterintuitive behavior that can be exploited in the developing field of quantum technology. They are needed for various applications such as quantum key distribution, optical quantum information processing, quantum computing, intensity measurement standards, and others yet to be discovered in this developing field. This drives the current intensive research into the realization of true deterministic sources of single photons on demand. Lacking such a source, many researchers default to the well-established workhorse: spontaneous parametric down-conversion that generates entangled signal-idler pairs. Since this source is thermal statistical in nature, it is common to use a detected idler photon to herald the production of a signal photon. The need exists to determine the quality of the single photons generated in the heralded signal beam. Quite often, the literature reports a heralded second-order coherence function of the signal photons conditioned on the idler photons using readily available single-photon detectors. In this work we examine the applicability of this technique to single-photon characterization and the consequences of the fact that the most commonly used single-photon detectors are not photon-number resolving. Our results show that this method using non-photon-resolving detectors can only be used to characterize the signal-idler correlations rather than the nature of the signal-photon state alone.
