Highly reliable hard-soldered 1.6kW QCW laser diode stack packaging platform

Rosenberg, Paul; Reichert, Patrick; Du, Jing; Fouksman, Michael; Zhou, Hailong; McNulty, John A.; Tolman, S.; Luong, Calvin

doi:10.1117/12.701303

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…The bars have a 90% fill-factor, 1.5mm cavity length and fast axis divergence of 23 degrees. The traditional G-stack uses AuSn bonding of the p-side die to CuW rails and a BeO insulating plate (details given in ref [1]). This stack can be configured to hold 2 to 7 bars that are connected electrically in series; the results in this paper will show 7 bar stack results with 200W/bar.…”

Section: High Density Stackmentioning

confidence: 99%

High-brightness kW QCW diode laser stacks with ultra-low pitches

et al. 2009

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State-of-the-art QCW solid-state lasers are demanding ever higher brightness from the pump source-conduction cooled diode laser stacks. The intensity of a QCW vertical stack is limited by the peak power of each diode bar and the bar pitch. The minimum bar pitch of the existing laser diode stacks on the market is about 400um. In this paper, we present a unique vertical diode laser stack package design to achieve a bar pitch as low as 150um, which improves the intensity of the stack by nearly 3 times. Together with the state-of-art diode laser bar from Coherent, greater than 30kW/cm 2 peak power density is achieved from the emitting area of the vertical stack. The p-n junction temperature of the diode bars in the device under QCW operation is modeled with FEA software, as well as measured in this research. Updated reliability results for these diode laser stacks are also reported.

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Section: High Density Stackmentioning

confidence: 99%

High-brightness kW QCW diode laser stacks with ultra-low pitches

et al. 2009

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“…As QCW operation reduces overall heating we can operate closer to the COD level, greatly increasing peak achievable output power. It is important to note that the heat dissipated during the pulse causes a temperature transient near the active regions of the laser bar and thus a wavelength chirp [12]. This spectral broadening should be taken into account.…”

Section: Introductionmentioning

confidence: 99%

Highly stable conductively cooled 1 kW - QCW diode laser stacks with high duty cycle

Pittroff

Erbert

Eppich

et al. 2008

2008 58th Electronic Components and Technology Conference

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A new mini-bar design with densely packed 13 emitters in 1,6 mm aperture has been developed These mini-bars deliver > 200 W output. With a very low divergence of 95% power enclosed in 25° they are suitable for fast axis collimation (FAC) lenses with large working distance. The mini-bars are mounted on compact CuW carriers, which are further integrated into a custom stack assembly where they are conductively cooled from both sides. This completely AuSn soldered stack consists of only CTE matched materials and was 100 times temperature cycled from -40°C…85°C without any change. The beam parameter product (95% power) of a 12 layer Stack is in the vertical direction (after FAC) ≤45 mm⋅mrad and in the lateral direction ≤75 mm⋅mrad. Thus the stack can be coupled to an 1.2 mm multi mode fibre with a coupling efficiency of 90% using only low-cost lenses.

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