Semiconductor device and piezoelectric stack optical mounting assembly

摘要: An external cavity laser assembly in which the chip is within a hermetically sealed package and outside hermetic package. A collimating lens screw threaded mounting disposed package, thread permitting focussing. The turned by rotation translation of grating, position electrically controlled via piezoelectric stacks. Thermal expansion stacks compensated grating on rod suitable material (e.g., ceramic) also serves to reduce length while allowing maximum piezoextension. In second embodiment tunable amplifier, with being driven similar manner provide tuning.