We report a novel type of monolithically integrated tunable semiconductor laser. The tuning is achieved by three intracavity Mach-Zehnder interferometers, realized in passive waveguides and using voltage-controlled electro-optic phase modulators requiring only four control voltages. potential the design demonstrated laser system that shows an optical linewidth 363 kHz, output power 3 mW, record range 74.3 nm. Such continuous wavelength span excess any monolithic reported up to date....

Abstract In this article, the potential of photonic integrated circuits (PICs) for modern gas sensing applications is discussed. Optical detection systems can be found at high-end currently available detectors, and PIC-based optical spectroscopic devices promise a significant reduction in size cost. The performance such reviewed here. This discussion not limited to one semiconductor platform, but includes several platforms operating from visible wavelength range up long infrared. different...

Robinia wood has a high technical and economic potential due to its future availability, mechanical properties, durability. This also applies use in structural timber construction. Such applications require the manufacture of bonded construction products from this type order compensate for dimensional shortcomings. In an application-oriented research project, tests were carried out manufacturing technologies resulting properties glued laminated made hardwood species purposes. Based on...

We present a widely tunable extended cavity ring laser operating at 2 μm that is monolithically integrated on an indium phosphide substrate.The photonic circuit designed and fabricated within multiproject wafer run using generic integration technology platform.The features intracavity tuning mechanism based nested asymmetric Mach-Zehnder interferometers with voltage controlled electro-refractive modulators.The operates in single-mode regime over the recorded wavelength range of 31 nm,...

We report a monolithically integrated coupled extended-cavity distributed Bragg reflector laser with, to our knowledge, the lowest reported intrinsic linewidth of ∼10 kHz, which is extracted from corresponding frequency-noise level ∼3200 Hz2/Hz, realized on an InP generic foundry platform. Using delayed self-heterodyne method, experimentally measured was 45 kHz. The has on-chip optical output power 18 mW around 1550 nm at injection current 95 mA. operates in single-mode regime with side-mode...

The feasibility of a portable NIR sensor for off-line determination diverse wood quality aspects relevant in the production glue-laminated timber was demonstrated. best performance noticed assessing moisture content, with lower capacity to estimate density and mechanical properties. spectroscopy modestly capable predicting surface roughness. However, traceability raw resources automatic classification defects were successfully developed chemometric model could predict total delamination...

Absorption spectroscopy on CO2 for the determination of gas temperature is reported. Direct absorption a frequency comb laser through cell at atmospheric conditions analysed with virtually imaged phased array spectrometer. Several measurement and analysis techniques are investigated to find parameters most sensitive changes in temperature. Some these show qualitative agreement theoretical predictions where trend similar calculated values.

To be of commercial interest, gas sensors must optimise, among others, sensitivity, selectivity, longevity, cost and measurement speed. Using the example ammonia, we establish that integrated optical provide means to maintain benefits detection set-ups at, in principle, a lower smaller footprint than currently available products. Photonic circuits (PICs) can used environmental agricultural monitoring. The small great scaling PICs allow for sensor networks with multiple devices. We show,...

This study investigates the influence of different machining processes on tensile shear strength glued lumber, focusing optimizing tool geometry face milling. The data obtained were analyzed using statistical methods. roughness surface produced by process and damage to microstructure under cutting edge are identified as important factors influencing quality bond. results show that optimized (low damage) leads more effective gluing.

The measurement of distance plays an integral part in many aspects modern societies. In this paper integrated mode-locked laser on a chip is used for based mode-resolved interferometry. emission from the on-chip source with repetition rate 2.5 GHz and spectral bandwidth 3 nm coupled into Michelson interferometer. interferometer output recorded as interferogram, which captured single camera image. images are analyzed using Hilbert transform to extract distance. derived shows deviation 6 μm...

In this work we present a design of an external optical cavity based on Fabry-Perot etalons applied to 100 MHz Er-doped fiber frequency comb working at 1560 nm increase its repetition frequency. A is constructed transportable cage system with two silver mirrors in plano-concave geometry including the mode-matching lenses, coupled collimation package and detection unit. The enables full 3D angle mirror tilting x-y off axis movement as well distance between mirrors. We demonstrate by direct...

Abstract Aufgrund ansteigender Nutzlaubholzbestände sind die physikalisch‐mechanischen Eigenschaften sowie mögliche Verwendungsbereiche von Laubholz in den letzten Jahren wieder verstärkt Inhalt verschiedener Forschungsarbeiten. Die meisten Laubholzarten haben einen wesentlich höheren Elastizitätsmodul und deutlich höhere Quell‐und Schwindmaße als Nadelhölzer, was Klebfugen bei Feuchteänderungen zu Spannungen führt. nachfolgenden Untersuchungen wurden an dreischichtigen Massivholzplatten...

We present a widely tunable laser design based on three intra-cavity Mach-Zehnder interferometers. The has been fabricated in multi-project wafer run and does not require high precision lithography, as needed for SGDBR lasers. demonstrate 20 nm of tuning range with output powers approximately 1 mW fiber. With an excess 30 dB side-mode suppression ratio, the can find applications gas spectroscopy, which is also supported by absorption measurement HCN-filled cell. Tuning demonstrated solely...

We demonstrate optical bistability in a ${\ensuremath{\chi}}^{(2)}$-nonlinear plasmonic nanocavity. The nanocavity is made from metal-insulator-metal waveguide possessing stubs as realistic mirrors. design of the sufficiently flexible to allow for resonances at both fundamental and second-harmonic frequency phase-matched nonlinear interaction. By using rigorous diffraction theory mean-field approach, we establish conditions required observe present optimal configurations with regard minimum...

Progress on the development of a long wavelength (∼2 µm) generic monolithic photonic integration technology indium phosphide substrate and novel concept tunable laser realized as integrated circuit using such are presented. Insights into active passive waveguide structures which used to define limited set on-chip functionalities in form building blocks will be given. A was proposed designed predefined basic blocks. The geometry features an intra-cavity tuning mechanism based asymmetric...

We demonstrate narrow-bandwidth, low-kappa, distributed Bragg reflector (DBR) grating filters on an indium phosphide (InP) generic foundry platform. With the varying corrugation widths of DBR grating, we achieve flexibility in design coupling coefficients from 10 to 50cm −1 , which correspond bandwidths 0.68 nm 1.28 nm, respectively. These values are experimentally observed and agree well with theoretical analysis. The is based periodic rectangular grooves quaternary material that placed...

We present a fully integrated optical ammonia sensor, based on photonic circuit (PIC) with tunable laser source and hollow-core fiber (HCF) as gas interaction cell. The PIC also contains photodetector that can be used to record the absorption signal same device. sensor targets an line at 1522.45 nm, which reached indium phosphide-based telecom compatible PICs. A 1.65-m long HCF is connected both ends single-mode (SMF) mechanical splice allows filling purging of within few minutes. show...