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Efficient and compact green laser for micro‐projector applications
Author(s) -
Bhatia Vikram,
Gregorski Steven J.,
Pikula Dragan,
Chaparala Satish C.,
Loeber David A. S.,
Gollier Jacques,
Gregorski Joan D.,
Hempstead Martin,
Ozeki Yukihiro,
Hata Yoshiaki,
Shibatani Kazuhiro,
Nagai Fumio,
Mori Nobuyoshi,
Nakabayashi Yukinobu,
Mitsugi Naoki,
Nakano Satoshi
Publication year - 2009
Publication title -
information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.182
H-Index - 20
eISSN - 2637-496X
pISSN - 0362-0972
DOI - 10.1002/j.2637-496x.2009.tb00075.x
Subject(s) - laser , projector , optics , distributed bragg reflector , materials science , optoelectronics , energy conversion efficiency , adaptive optics , computer science , physics
Efficient and compact green lasers are keystone components for micro‐projector applications in mobile devices. An architecture that consists of an infrared‐producing DBR (distributed Bragg reflector) laser with a frequency‐doubling crystal is used to synthesize a green laser that has high electrical‐to‐optical conversion efficiency and can be modulated at speeds required for scanner‐based projectors. The design and performance of a green‐laser package that uses adaptive optics to overcome the challenge of maintaining alignment between the waveguides of the DBR laser and the frequency‐doubling crystal over temperature and lifetime is described. The adaptive optics technology that is employed uses the piezo‐based smooth impact drive mechanism (SIDM) actuators that offer a very small step size and a range of travel adequate for the alignment operation. The laser is shown to be compact (0.7 cm 3 in volume) and capable of a wall‐plug efficiency approaching 10% (at 100‐mW green power). It was demonstrated that the adaptive optics enables operation over a wide temperature range (10–60°C) and provides the capability for low‐cost assembly of the device.