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Mid-infrared light generation by nonlinear optical frequency conversion in intersubband indium gallium arsenide/aluminum gallium arsenide quantum wells
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Mid-infrared light generation by nonlinear optical frequency conversion in intersubband indium gallium arsenide/aluminum gallium arsenide quantum wells
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Dissertation
Mid-infrared light generation by nonlinear optical frequency conversion in intersubband indium gallium arsenide/aluminum gallium arsenide quantum wells
1994
Overview
Compact diode laser based mid-infrared sources have many potential applications from pollution monitoring and intelligent process controls to laser radar and non-invasive medical diagnosis. Recent developments in long wavelength diode lasers have pushed room temperature continuous operation to wavelengths around 2.3 $\\mu$ m. However, room temperature operation of diode lasers at much longer wavelengths may not be possible due to Auger recombination. An alternative approach is to use nonlinear optical frequency conversion of efficient near-infrared diode lasers to generate mid-infrared light. Quantum wells (QWs) are an attractive material for frequency conversion. QWs have demonstrated optical nonlinearities several orders of magnitude larger than bulk materials arising from intersubband transitions (ISBTs). ISBTs are typically limited to long wavelengths. However, using strained QW materials, conduction band offsets can be increased so that ISBT energies overlap diode laser wavelengths. Thus, integrated diode laser pumps and QW nonlinear optical frequency converters could possibly function as compact mid-infrared sources. This thesis describes the development of highly strained InGaAs/AlGaAs QWs grown on GaAs for frequency conversion applications. Studies to optimize growth conditions are performed, resulting in improved material quality and narrow transition linewidths. The intersubband absorption of QWs with varying structures is characterized experimentally and modelled with a simple theory, and short wavelength ISBTs near 2 $\\mu$ m are demonstrated. The nonlinear optical properties are measured by second harmonic generation (SHG) with both a free electron laser and a CO $\\sb2$laser, and large nonlinearities at wavelengths as short as 1.85 $\\mu$ m are observed. Finally, mid-infrared generation by difference frequency mixing of two near-infrared wavelengths is demonstrated for the first time in any QW system.
Publisher
ProQuest Dissertations & Theses
ISBN
9798209193838
