Search for dissertations about: "Fabry-Perot cavities"

Found 4 swedish dissertations containing the words Fabry-Perot cavities.

2. 1. Fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry

   Author : Aleksandra Foltynowicz; Ove Axner; Weidong Chen; Umeå universitet; []
   Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; absorption spectrometry; frequency modulation; cavity enhancement; NICE-OHMS; Laser frequency stabilization; fiber laser; Fabry-Perot cavities; sub-Doppler spectroscopy; trace gas detection; Physics; Fysik; Molecular physics; Molekylfysik; fysik; Physics;

   Abstract : Noise-immune cavity-enhanced optical heterodyne molecular spectro-metry (NICE-OHMS) is one of the most sensitive laser-based absorption techniques. The high sensitivity of NICE-OHMS is obtained by a unique combination of cavity enhancement (for increased interaction length with a sample) with frequency modulation spectrometry (for reduction of noise). READ MORE

4. 2. Wafer-scale Vacuum and Liquid Packaging Concepts for an Optical Thin-film Gas Sensor

   Author : Mikael Antelius; Göran Stemme; Yogesh B. Gianchandani; KTH; []
   Keywords : Microelectromechanical systems; MEMS; Nanoelectromechanical systems; NEMS; silicon; wafer-level; packaging; vacuum packaging; liquid encapsulation; integration; wire bonding; grating coupler; waveguide; Fabry-Perot resonator;

   Abstract : This thesis treats the development of packaging and integration methods for the cost-efficient encapsulation and packaging of microelectromechanical (MEMS) devices. The packaging of MEMS devices is often more costly than the device itself, partly because the packaging can be crucial for the performance of the device. READ MORE

5. 3. Two-Dimensional Photonic Crystals in InP-based Materials

   Author : Mikaël Mulot; KTH; []
   Keywords : Photonic crystals; photonic bandgap materials; indium phosphide; dry etching; chemically assisted ion beam etching; reactive ion etching; electron beam lithography; photonic integrated circuits; optical waveguides; resonant cavities; optical filterin;

   Abstract : Photonic crystals (PhCs) are structures periodic in thedielectric constant. They exhibit a photonic bandgap, i.e., arange of wavelengths for which light propagation is forbidden. READ MORE

6. 4. Optical Frequency Comb Fourier Transform Spectroscopy

   Author : Alexandra C. Johansson; Aleksandra Foltynowicz; Ove Axner; Jürgen Röpcke; Umeå universitet; []
   Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Optical frequency comb spectroscopy; Fourier transform; molecular absorption dispersion; fysik; Physics;

   Abstract : Fourier transform spectroscopy (FTS) based on optical frequency combs is an excellent spectroscopic tool as it provides broadband molecular spectra with high spectral resolution and an absolutely calibrated frequency scale. Moreover, the equidistant comb mode structure enables efficient coupling of the comb to enhancement cavities, yielding high detection sensitivity. READ MORE