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Improving Bragg Reflection Waveguide Lasers for Quantum State Generation /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Improving Bragg Reflection Waveguide Lasers for Quantum State Generation /Trevor James Stirling.
作者:	Stirling, Trevor James,
面頁冊數:	1 electronic resource (160 pages)
附註:	Source: Dissertations Abstracts International, Volume: 86-10, Section: B.
附註:	Advisors: Helmy, Amr Committee members: Aitchison, Stewart; Ruda, Harry; Herman, Peter; Smowton, Peter.
Contained By:	Dissertations Abstracts International86-10B.
標題:	Electrical engineering.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31770344
ISBN:	9798310389953

Improving Bragg Reflection Waveguide Lasers for Quantum State Generation /
Stirling, Trevor James,

Improving Bragg Reflection Waveguide Lasers for Quantum State Generation /Trevor James Stirling. - 1 electronic resource (160 pages)

Source: Dissertations Abstracts International, Volume: 86-10, Section: B.

Bragg reflection waveguide lasers (BRLs) have shown great promise as electrically injected monolithic entangled photon sources, however to date have shown very low entangled pair flux. This thesis focuses on all aspects of the design of these lasers, including the vertical wafer structure, lateral waveguide design, and fabrication, with the goal of improving the pair generation rate.The theory to design a BRL with phase matched fundamental lasing mode and second harmonic guided modes is first developed, in order to produce entangled photon pairs through spontaneous parametric down conversion. The optimal number of AlGaInAs quantum wells in AlGaAs to minimize threshold current is determined, and a wafer is designed to support higher pump power and show improved thermal properties. A fabrication procedure was developed in a new facility to reduce optical losses and improve yield.The pair generation rate can be greatly improved if all of the laser power is contained in a single longitudinal mode. Conventional gratings, including distributed feedback and distributed Bragg reflectors, greatly increase the sidewall surface area resulting in high optical losses, which quantum states are extremely sensitive to, making these designs unsuitable. The theory behind gratings is analyzed and gratings with as few defects as possible, discrete mode laser diodes (DMLDs) are designed. These DMLDs show a 42.3 dB side mode suppression ratio with only 1.3 cm−1 additional loss over FPs, compared to DFBs which show an average of 6.7 cm−1 additional loss.Improving peak power through self-pulsation was also investigated, using BRLs broad bandwidth and highly tunable dispersion to produce short pulses. They can be designed to support Q-switching due to a dynamic equilibrium between charge carriers and photons, with simultaneous mode locking (QML). 94.2±3.1 fs pulses are produced, marking the first time sub-100 fs pulses have been produced in a monolithic electrically injected laser diode, a major milestone. 16.9 W peak power was achieved, which is also a record in laser diodes.These improvements enabled a monumental seven order of magnitude improvement in entangled photon flux, generating 1.04×106 pairs/s/facet at 1550 nm, with a 98.0% fidelity to a Bell state.

English

ISBN: 9798310389953Subjects--Topical Terms:

454503
Electrical engineering.
Subjects--Index Terms:

Bragg reflection waveguide lasers

Improving Bragg Reflection Waveguide Lasers for Quantum State Generation /
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520 $a Bragg reflection waveguide lasers (BRLs) have shown great promise as electrically injected monolithic entangled photon sources, however to date have shown very low entangled pair flux. This thesis focuses on all aspects of the design of these lasers, including the vertical wafer structure, lateral waveguide design, and fabrication, with the goal of improving the pair generation rate.The theory to design a BRL with phase matched fundamental lasing mode and second harmonic guided modes is first developed, in order to produce entangled photon pairs through spontaneous parametric down conversion. The optimal number of AlGaInAs quantum wells in AlGaAs to minimize threshold current is determined, and a wafer is designed to support higher pump power and show improved thermal properties. A fabrication procedure was developed in a new facility to reduce optical losses and improve yield.The pair generation rate can be greatly improved if all of the laser power is contained in a single longitudinal mode. Conventional gratings, including distributed feedback and distributed Bragg reflectors, greatly increase the sidewall surface area resulting in high optical losses, which quantum states are extremely sensitive to, making these designs unsuitable. The theory behind gratings is analyzed and gratings with as few defects as possible, discrete mode laser diodes (DMLDs) are designed. These DMLDs show a 42.3 dB side mode suppression ratio with only 1.3 cm−1 additional loss over FPs, compared to DFBs which show an average of 6.7 cm−1 additional loss.Improving peak power through self-pulsation was also investigated, using BRLs broad bandwidth and highly tunable dispersion to produce short pulses. They can be designed to support Q-switching due to a dynamic equilibrium between charge carriers and photons, with simultaneous mode locking (QML). 94.2±3.1 fs pulses are produced, marking the first time sub-100 fs pulses have been produced in a monolithic electrically injected laser diode, a major milestone. 16.9 W peak power was achieved, which is also a record in laser diodes.These improvements enabled a monumental seven order of magnitude improvement in entangled photon flux, generating 1.04×106 pairs/s/facet at 1550 nm, with a 98.0% fidelity to a Bell state.
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