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Evaluation of white-light generation as possible seed for a mid-infrared optical parametric chirped pulse amplifier

Lu, Chuang LU (2017) In Lund report on Atomic Physics FYSM60 20162
Department of Physics
Nuclear physics
Abstract
White-light spectra of different crystals, based on 1030-nm intense pump pulses have been investigated in order to derive a near-infrared seed for mid-infrared generation. Among ten crystals, YAG (yttrium aluminium garnet), KGW (potassium gadolinium tungstate) and YVO4 (yttrium orthovanadate) exhibit the most suitable properties for supercontinuum generation with high efficiency for spectral broadening as well as high tolerance to optical damage. Numerical simulations of laser induced filamentation, a dynamic balance between self-focusing and plasma defocusing resulting in supercontinuum generation, have been carried out to interpret and support our results theoretically. The simulations are in fair agreement with experimental results and... (More)
White-light spectra of different crystals, based on 1030-nm intense pump pulses have been investigated in order to derive a near-infrared seed for mid-infrared generation. Among ten crystals, YAG (yttrium aluminium garnet), KGW (potassium gadolinium tungstate) and YVO4 (yttrium orthovanadate) exhibit the most suitable properties for supercontinuum generation with high efficiency for spectral broadening as well as high tolerance to optical damage. Numerical simulations of laser induced filamentation, a dynamic balance between self-focusing and plasma defocusing resulting in supercontinuum generation, have been carried out to interpret and support our results theoretically. The simulations are in fair agreement with experimental results and they support the finding that low-bandgap materials like YVO4, YAG and KGW seem to be better suited than high-bandgap materials, like fused silica and fluorides. (Less)
Popular Abstract
Nowadays, mid-infrared (MIR) light (2 μm to 10 μm) has provided excellent view of atoms, molecules and solids and opened up many applications, such as the observation of atmospheric reactions and non-invasive surgery. In particular, absorption spectroscopy benefits significantly from MIR sources because a large number of molecule absorption lines exist in the MIR region, which therefore is also called molecular fingerprint region. For example, water has very strong absorption lines near 3 μm, from which biomedical applications benefit, such as tissue surgery and imaging on dermatology.


In this project, we aim at the generation of MIR pulses from a near-infrared pump at 1030 nm. The MIR generation is based on a nonlinear optical... (More)
Nowadays, mid-infrared (MIR) light (2 μm to 10 μm) has provided excellent view of atoms, molecules and solids and opened up many applications, such as the observation of atmospheric reactions and non-invasive surgery. In particular, absorption spectroscopy benefits significantly from MIR sources because a large number of molecule absorption lines exist in the MIR region, which therefore is also called molecular fingerprint region. For example, water has very strong absorption lines near 3 μm, from which biomedical applications benefit, such as tissue surgery and imaging on dermatology.


In this project, we aim at the generation of MIR pulses from a near-infrared pump at 1030 nm. The MIR generation is based on a nonlinear optical process where the medium exhibits nonlinear response to the input light. One of these processes is called difference frequency generation (also called optical parametric amplification) where the energy from a higher frequency wave can be converted into a lower frequency wave, e.g. in our project, by mixing the output of the 1030-nm pulsed laser with light at 1500-nm, resulting in 4 μm MIR light. The wave at 1500 nm is called signal wave (seed) and the resulting wave at 4 μm is called idler wave.

The thesis work focuses on the generation of the signal wave at 1500 nm which should be derived from the pump radiation at 1030 nm. The generation of the signal wave is based on another set of nonlinear interactions between a laser pulse and a medium, such as self-focusing, self-phase modulation and plasma defusing, that lead to a super broadband spectrum (supercontinuum) covering our desired range (1.4 μm to 1.6 μm). Several materials have been investigated for the preparation of supercontinuum generation. The experimental results indicate that YAG (yttrium aluminium garnet), KGW (potassium gadolinium tungstate) and YVO4 (yttrium orthovanadate) are the most suitable materials, with high efficiency for spectral broadening as well as high tolerance to optical damage. The experimental results are supported by simulations which were performed based on a nonlinear pulse propagation model. (Less)
Please use this url to cite or link to this publication:
author
Lu, Chuang LU
supervisor
organization
course
FYSM60 20162
year
type
H2 - Master's Degree (Two Years)
subject
keywords
nonlinear linear optics, ultrafast optics, Mid-infrared generation, near-infrared, Optical parametric amplification, Optical Parametric Chirped-pulse Amplification, supercontinuum generation, white-light generation, laser induced filamentation, Dispersion-scan, nonlinear propagation
publication/series
Lund report on Atomic Physics
language
English
id
8906730
date added to LUP
2017-05-14 14:27:44
date last changed
2017-05-14 14:27:44
@misc{8906730,
  abstract     = {White-light spectra of different crystals, based on 1030-nm intense pump pulses have been investigated in order to derive a near-infrared seed for mid-infrared generation. Among ten crystals, YAG (yttrium aluminium garnet), KGW (potassium gadolinium tungstate) and YVO4 (yttrium orthovanadate) exhibit the most suitable properties for supercontinuum generation with high efficiency for spectral broadening as well as high tolerance to optical damage. Numerical simulations of laser induced filamentation, a dynamic balance between self-focusing and plasma defocusing resulting in supercontinuum generation, have been carried out to interpret and support our results theoretically. The simulations are in fair agreement with experimental results and they support the finding that low-bandgap materials like YVO4, YAG and KGW seem to be better suited than high-bandgap materials, like fused silica and fluorides.},
  author       = {Lu, Chuang},
  keyword      = {nonlinear linear optics,ultrafast optics,Mid-infrared generation,near-infrared,Optical parametric amplification,Optical Parametric Chirped-pulse Amplification,supercontinuum generation,white-light generation,laser induced filamentation,Dispersion-scan,nonlinear propagation},
  language     = {eng},
  note         = {Student Paper},
  series       = {Lund report on Atomic Physics},
  title        = {Evaluation of white-light generation as possible seed for a mid-infrared optical parametric chirped pulse amplifier},
  year         = {2017},
}