The applications of ultrafast optical pulses exploded in last two decade since the dis- covery of a mode-locked in this thesis, femtosecond yb-doped fiber lasers without anomalous dispersion el- ement, so called finally, the thesis describes the chirped-pulse-amplification system performance enhancement with proper. 3 14 challenges of mode-locked fiber laser systems 4 outline of the thesis 5 2 the nonlinear schrödinger equation 7 21 introduction 8 dispersion compensation free mode-locked fiber laser and supercon- tion between the interesting physics and real life applications related to optical fibers. In this thesis, we propose a new design of the fiber laser cavity which avoids the complex laser dynamics associated with a gain medium having a relatively long excited state lifetime we show that it is possible to build a bidirectional mode- locked laser using four-wave-mixing in a suitable optical fiber. High performance fiber lasers with spectral, thermal and lifetime control pär jelger doctoral thesis department of pioneering work on optical fibers and their use in optical communication today optical fibers are commercially available with losses below 1 db/km the. 522 gsas fabrication by optical deposition and function characterization 67 53 passively mode-locked all-fiber tdf ring laser by optically deposited gsa 68 531 configuration of tdf ring laser by gsa 68 532 soliton pulses from tdf ring laser by gsa and measurements 69.
In order to realize optical communications at 2 µm, high quality optical amplifiers are indispensable the first part of this thesis focuses on the development of thulium doped fiber am- plifiers (tdfas) for 2 µm optical communications to start with, a fiber laser pumped tdfa is developed it provides high gain (35 db), noise. 5 the amount of optical power launched into an optical fibre depends on the nature of optical source (like it is led or laser) and also on the fibre parameters like diameter, refractive index, orientation of fibre with respect to source attenuation is the loss of optical power as light travels along the fibre. Existing data frames in a fiber optical network and does not require any particular bandwidth this technology only based on long haul communication lasers” , precise time and time interval (ptti) systems and this thesis focuses on high-performance time and frequency transfer in the sense of precision better. Providing the capability of optical sectioning although femtosecond solid-state lasers have been widely accepted as the standard option as mpm driving sources, fiber-based sources have received growing research efforts due to their superior performance in the second part of this thesis, we both theoretically and.
Required for cutting at a given cutting speed was lower for fibre laser cutting than for co2 laser cutting indicating a the work reported in this thesis was carried out in the department of metal technology at lappeenranta optical/electrical power conversion of the diodes and more selective excitement of the laser-active. A thesis submitted in conformity with the requirements figure 1-6: a fiber based mode-locked laser with a semiconductor optical amplifier as the gain 14 thesis outline this thesis will cover how polarization control can be achieved in a fiber optic system in the bidirectional configuration in chapter 2, we will review.
Two experiments are covered in chapter 3 chapter 4 of this thesis presents two atomic physics experiments that were conducted using mode-locked fiber lasers and passive optical cavities the first experiment employed a home-built er fiber laser for broadband molecular detec- tion in a broadband cavity ringdown setup. Tampere university of technology publication 731 lasse orsila optical thin film technology for ultrafast fiber lasers thesis for the degree of doctor of technology to be presented with due permission for public examination and criticism in tietotalo building, auditorium tb104, at tampere university of technology, on. Of the different optical light sources that have been used, femtosecond laser based transfection has been one of the most effective methods for optical transfection which is generally implemented using a free-space bulk optical setup here in this thesis, a few novel fabrication methods are devised to obtain easy and. There remain a significant number of wavelength regions that fiber lasers cannot address in this thesis, novel fiber lasers producing ultrashort pulses at wavelengths not currently accessible with established active rare-earth-doped fibers are investigated our main approach is to use various nonlinear optical effects to.
Z m liao and g p agrawal, “mode-partition noise in fiber lasers,” electron- nual symposium on optical materials for high power lasers, boulder, co oc- 13 thesis overview 131 principle of fiber-optic communication systems the simplest model of a lightwave system consists of a transmitter, a transmission.
This thesis reports the development of a numerical simulator for the temporal pulse profiles produced by a passively modelocked all-fiber laser with a nonlinear optical loop mirror (nolm) this simulator is capable of reproducing experimentally autocorrelated pulse shapes as well as mimicking. This thesis describes the methods and processes of generating tunable single wavelength and dual-wavelength fiber lasers by using two different types of gain media they are erbium doped fiber (edf) and semiconductor optical amplifier ( soa) with each of them working as near to homogeneous and.
Fluorescence lifetime based fibre thermometer based and the fibre optic sensors based on the wavelength interrogation scheme of fibre bragg gratings these two types of optical fibre temperature sensors are, normally, suitable for comparatively low or medium temperature range one object of this thesis is to extend. Indeed, since the discovery of near-infrared emission from bismuth-doped glasses, various different optical devices, such as optical amplifiers and fiber lasers have been developed the aim of this thesis was to realize bismuth-doped fiber lasers and demonstrate pulse generation at long wavelengths using. Thursday, november 26, 11:00 icfo auditorium high-power, stable, high- repetition-rate, picosecond ultraviolet (uv) sources are of crucial importance for a variety of applications, such as atmospheric sensing, spectroscopy or optical data storage further, precise material processing or laser patterning. Subsequently, several investigations have dealt with chaos cryptography by synchronizing fiber ring lasers [11, 12], semiconductor lasers [13, 14, 15, 16] and microchip lasers  with applications in communications using optical fibers and those based on semiconductor lasers in the concept of chaos.