Mark Zediker - Academia.edu (original) (raw)
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Papers by Mark Zediker
High-Power Diode Laser Technology and Applications, 2003
Novel waveguide structures are presented that facilitate high power, single lateral mode output i... more Novel waveguide structures are presented that facilitate high power, single lateral mode output in narrow stripe semiconductor lasers. Flared tapered waveguide lasers, fabricated by a metal-organic chemical vapor deposition (MOCVD) selective area epitaxy (SAE), are shown to attain output powers of 650mW with stable single lateral mode beam properties. Novel integrated mode filters, which induce mode selective lateral radiation loss
The 15th Annual Meeting of the IEEE Lasers and Electro-Optics Society
We demonstrate a spatial filter design that completely eliminates beam steering and oscillation o... more We demonstrate a spatial filter design that completely eliminates beam steering and oscillation of high order lateral modes in narrow stripe InGaAs single QW diode lasers.
IEEE Photonics Technology Letters, 2001
A new laser design for single-mode high-power applications is reported. The waveguide is a latera... more A new laser design for single-mode high-power applications is reported. The waveguide is a laterally flaring and transversely tapering GaAs buried ridge fabricated by selective area epitaxy. Single-lateral-mode powers of 200 mW were achieved.
Critical Review: Industrial Lasers and Applications, 2005
As tools for use in industrial applications, High Power Direct Diode Lasers [HPDDL], also known a... more As tools for use in industrial applications, High Power Direct Diode Lasers [HPDDL], also known as semiconductor lasers, are becoming more prevalent as a heat source for industrial applications. Diode laser technology has now been used in production for a number of years. Their unique beam shape, low ownership cost, high efficiency (~60%), and compact design make them an economic alternative to traditional heat technologies for heat treating and cladding of overlay operations. The benefits of using HPDL for laser surface transformation hardening and cladding are discussed.
Laser welding of highly reflective materials such as copper has been problematic for infrared las... more Laser welding of highly reflective materials such as copper has been problematic for infrared lasers due to the low initial absorption of the material during the welding process. This paper will report on the recent bead on plate test results with a 275 Watt CW blue laser for welding copper foils up to 500 μm thick at 450 nm where the initial absorption is ~65%. Highly stable conduction mode welding of copper is observed over a wide processing window using the blue laser source. Stable, low spatter keyhole welding is also observed with complete penetration of the 500 μm thick copper foil. Both welding regimes exhibit highly stable weld puddles with minimal porosity and no gaps in the weld bead due to melt ejection. Processing of the parts can be done at a near orthogonal orientation due to the low reflected energy from the copper surface.
High-Power Diode Laser Technology and Applications, 2003
Novel waveguide structures are presented that facilitate high power, single lateral mode output i... more Novel waveguide structures are presented that facilitate high power, single lateral mode output in narrow stripe semiconductor lasers. Flared tapered waveguide lasers, fabricated by a metal-organic chemical vapor deposition (MOCVD) selective area epitaxy (SAE), are shown to attain output powers of 650mW with stable single lateral mode beam properties. Novel integrated mode filters, which induce mode selective lateral radiation loss
The 15th Annual Meeting of the IEEE Lasers and Electro-Optics Society
We demonstrate a spatial filter design that completely eliminates beam steering and oscillation o... more We demonstrate a spatial filter design that completely eliminates beam steering and oscillation of high order lateral modes in narrow stripe InGaAs single QW diode lasers.
IEEE Photonics Technology Letters, 2001
A new laser design for single-mode high-power applications is reported. The waveguide is a latera... more A new laser design for single-mode high-power applications is reported. The waveguide is a laterally flaring and transversely tapering GaAs buried ridge fabricated by selective area epitaxy. Single-lateral-mode powers of 200 mW were achieved.
Critical Review: Industrial Lasers and Applications, 2005
As tools for use in industrial applications, High Power Direct Diode Lasers [HPDDL], also known a... more As tools for use in industrial applications, High Power Direct Diode Lasers [HPDDL], also known as semiconductor lasers, are becoming more prevalent as a heat source for industrial applications. Diode laser technology has now been used in production for a number of years. Their unique beam shape, low ownership cost, high efficiency (~60%), and compact design make them an economic alternative to traditional heat technologies for heat treating and cladding of overlay operations. The benefits of using HPDL for laser surface transformation hardening and cladding are discussed.
Laser welding of highly reflective materials such as copper has been problematic for infrared las... more Laser welding of highly reflective materials such as copper has been problematic for infrared lasers due to the low initial absorption of the material during the welding process. This paper will report on the recent bead on plate test results with a 275 Watt CW blue laser for welding copper foils up to 500 μm thick at 450 nm where the initial absorption is ~65%. Highly stable conduction mode welding of copper is observed over a wide processing window using the blue laser source. Stable, low spatter keyhole welding is also observed with complete penetration of the 500 μm thick copper foil. Both welding regimes exhibit highly stable weld puddles with minimal porosity and no gaps in the weld bead due to melt ejection. Processing of the parts can be done at a near orthogonal orientation due to the low reflected energy from the copper surface.