Coherent light generators – Particular active media – Semiconductor
Patent
1995-09-12
1997-07-01
Bovernick, Rodney B.
Coherent light generators
Particular active media
Semiconductor
372 50, 257 88, H01S 318
Patent
active
056445865
ABSTRACT:
In a semiconductor laser device including a stack of semiconductor laser chips, each semiconductor laser chip includes opposite upper and lower surfaces, an upper electrode disposed on a portion of the upper surface, and a lower electrode disposed on a portion of the lower surface. Two adjacent semiconductor laser chips in the stack are connected such that the lower electrode of an upper laser chip is bonded to the upper electrode of a lower laser chip with solder. Since the upper electrode (lower electrode) is disposed on a portion of the upper surface (lower surface) of each laser chip, i.e., it is not disposed over the entire upper surface (lower surface) of the laser chip, the solder hardly flows over the side surface of the laser chip, so that unwanted short-circuiting between the upper electrode and the lower electrode of the laser chip is avoided. In addition, when solder is molten between two electrodes, the molten solder spreads over the surfaces of the electrodes, and the surface tension of the molten solder draws the electrodes to each other so that the electrodes are automatically aligned with each other. Therefore, in this stacked laser device, since the surface tension of the molten solder functions between the upper electrode and the lower electrode of the adjacent laser chips, automatic alignment is performed between these laser chips.
REFERENCES:
Jackson et al, "Flip-Chip, Self-Aligned Optoelectronic Transceiver Module", 18th European Conference on Optical Communication, 1992, pp. 329-332 (no month available).
Kawano Minoru
Sakaino Go
Bovernick Rodney B.
Mitsubishi Denki & Kabushiki Kaisha
Song Yisun
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