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Development of parametric amplifiers for high-power tuneable laser sources

Duering, Malte Werner

Description

Countless technologies, ranging from spectroscopy to material processing, require coherent light delivered in short pulses. Solid state laser technology can produce a wide range of pulse durations and repetition rates in nearly diffraction limited beams at ever increasing output powers, but the output wavelength is ultimately determined and limited by the laser gain material. If the wavelength required for a particular application cannot be met by an appropriate laser, nonlinear optics has to...[Show more]

dc.contributor.authorDuering, Malte Werner
dc.date.accessioned2018-11-22T00:06:42Z
dc.date.available2018-11-22T00:06:42Z
dc.date.copyright2011
dc.identifier.otherb2878938
dc.identifier.urihttp://hdl.handle.net/1885/150823
dc.description.abstractCountless technologies, ranging from spectroscopy to material processing, require coherent light delivered in short pulses. Solid state laser technology can produce a wide range of pulse durations and repetition rates in nearly diffraction limited beams at ever increasing output powers, but the output wavelength is ultimately determined and limited by the laser gain material. If the wavelength required for a particular application cannot be met by an appropriate laser, nonlinear optics has to be employed to convert the light produced by a pump laser to the required wavelength. This thesis explores the generation of several Watts of coherent radiation in pico-second duration pulses, using optical parametric amplifiers to produce wavelengths that cannot be obtained directly from a laser. Optical parametric amplifiers (OPA) are versatile tools for the generation of tuneable light and have several advantages over alternative devices such as optical parametric oscillators or optical parametric generators. They do not require a resonant cavity and their output characteristics are directly determined by the temporal and spatial characteristics of the pump. Since an OPA is seeded by a second laser source, this results in excellent output frequency control and can lead to "push button" tuneability due to the large OPA gain bandwidth. When high output power is required, it is of advantage to cascade several OPAs in series as will be discussed in this work. The use of OPAs to address the requirements of two very different applications is described in this thesis. One requires visible 589nm radiation for the generation of a sodium guidestar source required for adaptive optics used with astronomical telescopes. The other application relies on tuneable mid-infrared picosecond pulses, needed to evaporate polymers via resonant infrared pulsed laser deposition (RIR-PLD), a physical vapor deposition process for the generation of thin polymer films. Various schemes, relying on quasi phase matching and birefringent phase matching using different nonlinear materials were investigated. The factors that optimise the efficiency of OPAs aimed at multi-Watt outputs are discussed. Cascading is employed to overcome output power limitations of a single OPA stage whilst maintaining good beam quality and frequency control. An OPA emitting in the mid-infrared was used to characterise the ablation of polystyrene by RIR-PLD using single picosecond mid-IR pulses for the first time. Several peer-reviewed publications resulted from the work discussed in this thesis.They are listed in the Appendix.
dc.format.extentxi, 177 leaves.
dc.language.isoen_AU
dc.rightsAuthor retains copyright
dc.subject.lccTK7871.24.D84 2011
dc.subject.lcshParametric amplifiers
dc.subject.lcshTunable lasers
dc.subject.lcshLaser pulses, Ultrashort
dc.titleDevelopment of parametric amplifiers for high-power tuneable laser sources
dc.typeThesis (PhD)
local.description.notesThesis (Ph.D.)--Australian National University
dc.date.issued2011
local.type.statusAccepted Version
local.contributor.affiliationAustralian National University.
local.identifier.doi10.25911/5d51476cafbd4
dc.date.updated2018-11-21T03:50:45Z
dcterms.accessRightsOpen Access
local.mintdoimint
CollectionsOpen Access Theses

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