A5058644182- Spectroscopy and Laser Applications
- Atomic and Subatomic Physics Research
- Scientific Measurement and Uncertainty Evaluation
- Advanced Fiber Optic Sensors
- Solid State Laser Technologies
- Photonic Crystal and Fiber Optics
- Semiconductor Lasers and Optical Devices
- Laser Design and Applications
- Surface Roughness and Optical Measurements
- Advanced Sensor Technologies Research
- Advanced Measurement and Metrology Techniques
Physikalisch-Technische Bundesanstalt
2020-2022
Ferdinand-Braun-Institut
2014
Abstract By measuring the refractivity and temperature of a gas, its pressure can be assessed from fundamental principles. The highest performing instruments are based on Fabry–Perot cavities (FPC). Gas modulation refractometry (GAMOR) is methodology that has ability to reduce influence disturbances such an extent high-precision (sub-parts-per-million) assessments made by use FPCs Invar. To allow for high accuracy assessments, it importance assess uncertainty contribution thermodynamic...
In this letter, we investigate experimentally single-mode fiber (SMF) coupling of a nondiffraction limited, astigmatic beam generated by near-infrared distributed Bragg reflector tapered diode laser at high output powers. particular, systematic study the efficiency as well spectral and spatial characteristics behind SMF is carried out in dependence on properties collimated beams front SMF, which are given operating points laser. A stigmatic, nearly Gaussian obtained independent point input...
The 18SIB04 QuantumPascal EMPIR project aims for development of photon-based standards that can replace primary the SI unit pressure, Pascal. In this project, four partners simulated pressure-induced deformation a given Fabry-Pérot cavity, using various versions two types software, COMSOL Multiphysics (R) and ANSYS Workbench. It was demonstrated that, geometry set material parameters, simulations could be performed by with such small discrepancies methodological mistakes simulation...
In this work, we investigate experimentally coupling of diode laser radiation into a single-mode-fiber (SMF) at high optical power. particular, nearly diffraction-limited, single-frequency continuous wave (CW) around 1064 nm generated by distributed Bragg reflector (DBR) tapered is coupled in bench-top experiment an SMF with core diameter approx. 6 μm. Misalignment tolerances for efficient are determined through two-dimensional efficiency scans, conducted attenuated beam. The and the beam...
In this letter, we investigate experimentally the influence of injection current-induced beam astigmatism change in a distributed Bragg reflector tapered diode laser on launching its nearly diffraction limited, simple astigmatic into single-mode fiber (SMF). particular, optical power and properties front behind SMF are examined dependence current injected taper section laser. The coupling measurements conducted at two fixed configurations applied system, each which is optimized for different...