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Frequency-resolved optical gating in periodically-poled lithium niobate waveguide devices

Frequency-resolved optical gating in periodically-poled lithium niobate waveguide devices
Frequency-resolved optical gating in periodically-poled lithium niobate waveguide devices
Frequency-Resolved Optical Gating (FROG) is a well-established and widely-employed technique for the intensity and phase characterisation of ultrashort optical pulses. Essentially, FROG involves mixing an ultrashort optical pulse with its time-delayed replica, or another pulse, in a nonlinear material or device to yield a two dimensional data set called a spectrogram, from which the electric field of the ultrashort pulse can be retrieved by an iterative algorithm. The most commonly used configuration is based on second-order nonlinear interactions in bulk materials, mainly because of its high efficiency compared to other schemes based on third-order nonlinear interactions. The research work in this thesis led to the first successful implementation of an integrated Lithium Niobate for the FROG device, based on sum-frequency generation. We demonstrated simultaneous complete characterisation of two ultrashort pulses of durations 4-25 ps in the 1.55 µm-band with a coupled energy of 430 fJ in a 26mm long PPLN waveguide device. The temporal walk-off between the interacting pulses in this interaction resulted in an acceptance bandwidth of 0.75 nm, limiting the measurable pulse duration to ~ 4.5 ps. In order to overcome this limitation, we proposed and demonstrated a novel FROG configuration based on cascaded second-harmonic and difference-frequency generations. Theoretical and numerical analyses of this configuration revealed its robustness against the temporal walk-off effect, resulting in improved temporal resolutions. This was experimentally verified by characterising a 2.1 ps pulse train with a coupled average power (energy) of 72 µW (29 fJ) in the PPLN waveguide device previously mentioned.
Prawiharjo, J.
9fe8624f-86aa-43d1-86c4-4f55b3df3e97
Prawiharjo, J.
9fe8624f-86aa-43d1-86c4-4f55b3df3e97
Broderick, Neil
eb2608ba-c4c5-42e8-93e5-57d3c829eb92

Prawiharjo, J. (2005) Frequency-resolved optical gating in periodically-poled lithium niobate waveguide devices. University of Southampton, Optoelectronics Research Centre, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

Frequency-Resolved Optical Gating (FROG) is a well-established and widely-employed technique for the intensity and phase characterisation of ultrashort optical pulses. Essentially, FROG involves mixing an ultrashort optical pulse with its time-delayed replica, or another pulse, in a nonlinear material or device to yield a two dimensional data set called a spectrogram, from which the electric field of the ultrashort pulse can be retrieved by an iterative algorithm. The most commonly used configuration is based on second-order nonlinear interactions in bulk materials, mainly because of its high efficiency compared to other schemes based on third-order nonlinear interactions. The research work in this thesis led to the first successful implementation of an integrated Lithium Niobate for the FROG device, based on sum-frequency generation. We demonstrated simultaneous complete characterisation of two ultrashort pulses of durations 4-25 ps in the 1.55 µm-band with a coupled energy of 430 fJ in a 26mm long PPLN waveguide device. The temporal walk-off between the interacting pulses in this interaction resulted in an acceptance bandwidth of 0.75 nm, limiting the measurable pulse duration to ~ 4.5 ps. In order to overcome this limitation, we proposed and demonstrated a novel FROG configuration based on cascaded second-harmonic and difference-frequency generations. Theoretical and numerical analyses of this configuration revealed its robustness against the temporal walk-off effect, resulting in improved temporal resolutions. This was experimentally verified by characterising a 2.1 ps pulse train with a coupled average power (energy) of 72 µW (29 fJ) in the PPLN waveguide device previously mentioned.

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Published date: 1 September 2005
Organisations: University of Southampton, Optoelectronics Research Centre

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Local EPrints ID: 30233
URI: https://eprints.soton.ac.uk/id/eprint/30233
PURE UUID: ed8f8a64-52b7-44e7-894a-d8afcbd76400

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Date deposited: 01 Jun 2006
Last modified: 17 Jul 2017 15:55

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