Sökning: "ber laser"

Visar resultat 1 - 5 av 7 uppsatser innehållade orden ber laser.

  1. 1. Dispersion management and characterization of ultrashort laser pulses for the optimization of parametric processes

    Master-uppsats, Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

    Författare :Axel Elfving; [2019]
    Nyckelord :frequency resolved optical gating; optical parametric amplification; difference frequency generation; nonlinear optics; laser pulse compression; lasers; optics; Technology and Engineering; Physics and Astronomy;

    Sammanfattning : This thesis set out to continue the development of a short-wave infrared (SWIR) optical parametric amplifier (OPA). The system is based on a Yb-ber chirped pulse amplification (CPA) laser delivering 400 fs long pulses, centered around 1030 nm, at 200 kHz repetition rate and 40 W average power. LÄS MER

  3. 2. Design of a Temperature Insensitive Fiber Interferometer for Long-Term Laser Frequency Stabilization using Metal Coated Fibers

    Master-uppsats, Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

    Författare :Saskia Bondza; [2019]
    Nyckelord :laser frequency stabilization; fiber interferometer; thermal sensitivity; optical fibers; drift-free; aluminum coated; thermal stress; Physics and Astronomy;

    Sammanfattning : This work presents the design for a temperature drift-free path imbalanced ber interferometer for long-term laser frequency stabilization using coated bers with different thermal drift. For this purpose, single acrylate, dual acrylate, copper and aluminum coated bers are analyzed theoretically and experimentally regarding the thermal sensitivity of their optical path length. LÄS MER

  4. 3. Beamforming in LTE FDD for Multiple Antenna Systems

    Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

    Författare :Atef Hatahet; Ankit Jain; [2018]
    Nyckelord :Beamforming; FDD; MIMO; LTE; AOA; Technology and Engineering;

    Sammanfattning : High data rate is still the most crucial factor in cellular systems, and with 5g approaching new techniques are studied to achieve higher bit rates. Using MIMO technology, the spatial domain was exploited through beamforming and multiplexing multiple users’ data together assured more spectrum efficiency which resulted in higher bit rates. LÄS MER

  5. 4. Source model for Immunostimulating Interstitial Laser Thermotherapy dosimetry

    Master-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Atomfysik

    Författare :Emily Emilsson; [2017]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : A common tool for tissue ablation is the use of heat. For the imILT technique investigated in this project, the heat is induced by the usage of laser light. The light is absorbed by the tissue and is thus turned into heat, the amount absorbed depends on the optical properties of the tissue, such as absorption and scattering. LÄS MER

  7. 5. Manufacturing Effects on Iron Losses in Electrical Machines

    Master-uppsats, KTH/Elektrisk energiomvandling

    Författare :Konstantinos Bourchas; [2015]
    Nyckelord :electrical machine; induction motor; iron losses; relative permeability; guillotine; ber laser; CO2 laser; laser settings; cutting effect; welding; electrical steel.; elektrisk maskin; induktion motor; järnförluster; relativ permeabilitet; giljotin; fiberlaser; CO2-laser; laser inställningar; skäreffekt; svetsning; elektromagnetisk plåt;

    Sammanfattning : In this master thesis, the magnetic properties of SiFe laminations after cutting and welding are studied. The permeability and the iron loss density are investigated since they are critical characteristics for the performance of electrical machines. LÄS MER