Sökning: "optical feedback"

Visar resultat 6 - 10 av 61 avhandlingar innehållade orden optical feedback.

1. 6. Laser diode systems for photodynamic therapy and medical diagnostics

   Författare :Eva Samsöe Andersen; Atomfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; quasi-phasematching; photodynamic therapy; laser-induced fluorescence; medical laser systems.; Histology; cytochemistry; histochemistry; tissue culture; Histologi; Laserteknik; Laser technology; cytokemi; histokemi; vävnadskultur; Diagnostik; Diagnostics; second harmonic generation; pulsed lasers; spatial filtering; Diode lasers; optical feedback; Fysicumarkivet A:2004:Samsöe Andersen;

   Sammanfattning : This work concerns techniques for improvement of the coherence properties of diode lasers so that they may be used in two specific medical applications: (Interstitial) photodynamic therapy (PDT) and laser-induced fluorescence diagnostics. In the first application, spatial coherence is crucial, since the treatment light should be delivered through relatively thin optical fibers to optimize treatment and to facilitate minimally invasive treatment. LÄS MER

3. 7. High speed CMOS optical receiver

   Författare :Håkan Bengtson; Linköpings universitet; []
   Nyckelord :TECHNOLOGY; TEKNIKVETENSKAP;

   Sammanfattning : Optical communication develops very fast and is today the main method for long distance wired communication. However cost is still high. Looking back to the evolution of optical transmission systems, one main objective of system development has become more and more important; minimize cost per gigabytes per second per kilometre, Gb/s/km. LÄS MER

4. 8. A sub-5 fs 100 TW optical parametric synthesizer

   Författare :Peter Fischer; Laszlo Veisz; Ove Axner; Cord L. Arnold; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Optical parametric amplification OPA ; optical parametric synthesizer OPS optimization; energy stability; carrier envelop phase stability; temporal intensity contrast; saturation; fewcycle; tera watt; fysik; Physics;

   Sammanfattning : State-of-the-art ultrashort light sources in the visible and near-infrared spectral regions provide direct access to the femtosecond realm, thereby enabling understanding and control of electronic processes within matter. On the other hand, ultra-intense light pulses lead to the emergence of relativistic electron motion and many related phenomena, such as electron & ion acceleration and high-order harmonic generation in plasmas. LÄS MER

5. 9. Ergonomic Risk Assessment and Intervention through Smart Workwear Systems

   Författare :Liyun Yang; Jörgen Eklund; Mikael Forsman; Karen Søgaard; KTH; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Physical Workload; Work Postures; Energy Consumption; Oxygen Uptake; Risk Assessment; Measurement Methods; Work-Related Musculoskeletal Disorders; Work-Related Ill Health; Wearable Sensors; Wearable Systems; Feedback; Ergonomic Intervention.; Fysisk arbetsbelastning; Arbetsställningar; Energiförbrukning; Syreupptag; Riskbedömning; Mätmetoder; Arbetsrelaterade muskuloskeletala besvär; Arbetsrelaterad ohälsa; Bärbara sensorer; Bärbara system; Återkoppling; Ergonomisk intervention.; Medicinsk teknologi; Medical Technology; Physical Workload;

   Sammanfattning : The rapid development of wearable technology has provided opportunities to ergonomics research and practice with new ways for workload measurements, data analytics, risk assessment and intervention. This thesis aims at developing and evaluating methods using wearable technologies to assess physical risk factors at work, and further to give feedback to employees to improve their work techniques. LÄS MER

7. 10. Dynamic and Static Diffractive Optics - some Examples

   Författare :Björn Löfving; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; subwavelength grating; spatial light modulator; phase retrieval; diffractive optics; ferroelectric liquid crystal; analog-to-digital conversion; optical switch; feedback generated hologram;

   Sammanfattning : Diffractive optics is a modern branch of optics, that exploits microstructures to manipulate the propagation of light. Fast computers and the progress in manufacturing technique of microelectronics have made possible a rapid development of diffractive optics during the past 10 years. LÄS MER