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Showing result 1 - 5 of 17 swedish dissertations matching the above criteria.

  2. 1. Tooth Interior Fatigue Fracture&Robustness of Gears

    Author : Magnus MackAldener; KTH; []
    Keywords : Gear; TIFF; FEM; Taguchi Method; Robustness; Interior Crack; Idler;

    Abstract : The demands the automotive gear designer has to considerduring the gear design process have changed. To design a gearthat will not fail is still a challenging task, but now lownoise is also a main objective. Both customers and legalregulations demand noise reduction of gears. Moreover, thequality of the product is more in focus than ever before. READ MORE

  4. 2. Tandem optical parametric oscillators using volume Bragg grating spectral control

    Author : Markus Henriksson; Fredrik Laurell; Hiromasa Ito; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; optical parametric oscillators; mid-infrared; volume Bragg gratings; PPKTP; ZGP; nonlinear optics; narrowband OPO; Physics; Fysik;

    Abstract : This thesis describes research on near degenerate quasi phase-matched opticalparametric oscillators (OPO) where volume Bragg gratings (VBG) are used toproduce narrow oscillation bandwidth. These OPOs are then used to pump a secondOPO to generate mid-infrared radiation. The atmospheric transmission windows in the 3. READ MORE

  5. 3. Phase Sensitive Amplifiers for Free-Space Optical Communications

    Author : Ravikiran Kakarla; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Phase sensitive amplifier; sensitivity; optical injection locking; noisefigure;

    Abstract : The demand for high data rate free-space communications is increasing due to the planned future space exploration missions. In the next few years there is a need to increase the speed by 100 times according to NASA, and this necessitates that transmission systems operate at higher carrier frequencies. READ MORE

  6. 4. Nanosecond tandem optical parametric oscillators for mid-infrared generation

    Author : Markus Henriksson; Fredrik Laurell; Gunnar Rustad; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; nonlinear optics; optical parametric oscillators; quasi-phase matching; mid-infrared; linewidth narrowing; volume Bragg gratings.; Physics; Fysik;

    Abstract : This thesis discusses a new scheme for generating radiation in the mid infrared spectral region, especially the 3.5-5 µm range. The scheme uses established Nd3+-lasers at 1.06 µm and down conversion in nonlinear optical crystals. READ MORE

  7. 5. Characterization of Phase-Sensitive and Phase-Insensitive Fiber Optical Parametric Amplifiers

    Author : Carl Peter Lundström; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fiber optical parametric amplifier;

    Abstract : The topic of this thesis is fiber optical parametric ampliers (FOPA). A unique feature of such ampliers is that they can operate in both phase-insensitive and phase-sensitive mode. The latter offers the potential of amplification without any added noise. READ MORE