Optical wavelength converting apparatus
Patent 5278869 Issued on January 11, 1994. Estimated Expiration Date: 
July 29, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 29, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesFrequency stabilized Ho:YAG laser Solid-state laser device capable of generating a harmonic laser beam at a high conversion efficiency Signal-resonant intracavity optical frequency mixing Patent #: 5142542 InventorsApplicationNo. 921119 filed on 07/29/1992US Classes:359/328, Harmonic generator372/22, Frequency multiplying (e.g., harmonic generator)372/31AmplitudeExaminersPrimary: Bovernick, Rodney B.Assistant: Wise, Robert E. Attorney, Agent or FirmInternational ClassH01S 003/13Foreign Application Priority Data1991-07-30 JPAbstractAn optical wavelength converting apparatus comprises a semiconductor laser, which is capable of oscillating in a multiple longitudinal mode, and an external resonator for resonating a laser beam, which has been radiated out of the semiconductor laser and which serves as a fundamental wave. An optical wavelength converting device is located in an optical path of the fundamental wave, which has been resonated by the external resonator. A device feeds part of the fundamental wave, which has been resonated by the external resonator, back to the semiconductor laser. A wavelength-converted wave in a single longitudinal mode is thereby obtained, which wave has a high intensity and is stable.Other References
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