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公开(公告)号：JP2000036630A
公开(公告)日：2000-02-02
申请号：JP18806699
申请日：1999-05-28
Applicant: LITTON SYSTEMS INC
Inventor： ROZELLE DAVID M , MICHAL RONALD J , LAM LEO K , CAPPI JOHN F
Abstract: PROBLEM TO BE SOLVED: To eliminate the backward reflection of exciting light by providing a stimulation light source which gives stimulation light to an optical fiber and guides the light to a first light shutter. SOLUTION: An optical light source is constituted in such a way that the light outputted from a first light shutter 18 is inputted to a wavelength multiplexer 26 and a gain fiber 34 is connected to the multiplexer 26 so that the wide-band light which is optically stimulated by stimulation light and outputted may be propagated to the multiplexer. In addition, an output optical fiber 29 is also connected to the multiplexer 26 so that part of the wide-band light sent from the gain fiber 34 may be guided to a second light shutter 50 and inputted to a fiber optic rotation sensor.
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2.发明申请SCALE FACTOR STABILIZATION OF A BROADBAND FIBER SOURCE USED IN FIBER OPTIC GYROSCOPES IN RADIATION ENVIRONMENTS 审中-公开辐射环境中光纤光栅中使用的宽带光纤源的尺度因子稳定性
公开(公告)号：WO0003201A3
公开(公告)日：2000-04-20
申请号：PCT/US9914495
申请日：1999-06-25
Applicant: LITTON SYSTEMS INC
Inventor： MICHAL RONALD J , LAM LEO K , ROZELLE DAVID M
CPC classification number: H01S3/06795 , G01C19/721
Abstract: A system for performing scale factor stabilization of a broadband optical signal source used in fiber optic gyroscopes in radiation environments. A filter device is positioned in-line with the broadband light emitted by the gain fiber to attenuate light outside of the bandwidth of the filter device. The filter device allows a bandwidth of light narrower than the spectral width of the broadband light source to propagate through while attenuating all wavelengths of light outside of its operating bandwidth. Only the portion of the broadband source spectrum contained within the bandpass of the filter is selected out, thus narrowing the spectral width of the broadband fiber source. This narrower spectral width reduces the shift of centroid wavelength of the broadband fiber source which results when the gain fiber and other sensitive optical components are exposed to ionizing radiation.
Abstract translation: 用于在辐射环境中用于光纤陀螺仪的宽带光信号源进行比例因子稳定的系统。 过滤装置与由增益光纤发射的宽带光线成一直线排列以衰减过滤装置的带宽以外的光。 滤波器装置允许比宽带光源的光谱宽度窄的光的带宽传播，同时衰减其工作带宽以外的所有波长的光。 选择包含在滤波器带通内的宽带源频谱的部分，从而使宽带光纤源的频谱宽度变窄。 这种较窄的光谱宽度减小了当增益光纤和其他敏感光学元件暴露于电离辐射时导致的宽带光纤源的质心波长的偏移。
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公开(公告)号：GB2284925B
公开(公告)日：1996-03-13
申请号：GB9222397
申请日：1992-10-26
Applicant: LITTON SYSTEMS INC
Inventor： MARTIN GRAHAM JOHN , LAM LEO K
Abstract: A triaxial multioscillator for operation in accordance with a mode of operation requiring the imposition of a substantially uniform axial magnetic field on the gain region of each lasing cavity. An integral frame of glass ceramic material has a rhombic dodecahedral shape and includes three closed lasing cavities, each formed of four straight segments. The cavities include three mutually parallel segments, one from each cavity, that are regularly spaced on a circle perpendicular to the axis of the frame. An internal cathode and six anodes are associated with the frame to provide gain in each of such three segments. The frame is positioned within a closed cylindrical element of soft iron composition by means of a fixture. The fixture positions magnets adjacent the top and bottom of the element to generate parallel lines of magnetic flux therein. The frame is positioned within the container in such a way that the cavity segments containing the three gain regions are aligned with the parallel lines of flux to produce the requisite axial fields in the three gain regions.
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公开(公告)号：FR2543747A1
公开(公告)日：1984-10-05
申请号：FR8404910
申请日：1984-03-29
Applicant: LITTON SYSTEMS INC
Inventor： LAM LEO K , PHILLIPS EDWARD
Abstract: A method and apparatus for optical pumping of an NMR cell by means of laser light. A current driver provides an a.c. current waveform as injection current to a laser diode. The resulting laser intensity spectrum closely approximates the absorption spectrum of the cell to thereby increase the signal generated for a given power input.
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公开(公告)号：DE4003800C2
公开(公告)日：1999-06-17
申请号：DE4003800
申请日：1990-02-08
Applicant: LITTON SYSTEMS INC
Inventor： HALL DAVID B , LAM LEO K
IPC: G01C19/66
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Patent Agency Ranking
公开(公告)号：GB2284925A
公开(公告)日：1995-06-21
申请号：GB9222397
申请日：1992-10-26
Applicant: LITTON SYSTEMS INC
Inventor： MARTIN GRAHAM JOHN , LAM LEO K
Abstract: A triaxial multioscillator comprises an integral block (10) of glass ceramic material which includes three closed lasing cavities (12, 14, 16), (fig 2, not shown), each formed of four straight segments, three mutually parallel segments, one from each cavity, being regularly spaced on a circle perpendicular to the axis (88) of the block and forming gain regions of the cavities. The block is positioned within a case (68) including magnets (40, 42, 46) adjacent the top and bottom of the case to generate parallel lines of magnetic flux (78) therein. The block is positioned within the case (68) in such a way that the three parallel cavity segments containing the three gain regions are aligned with the parallel lines of flux to produce axial magnetic fields in the three gain regions, whereby frequency locking is prevented.
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公开(公告)号：DE3411108A1
公开(公告)日：1984-10-11
申请号：DE3411108
申请日：1984-03-26
Applicant: LITTON SYSTEMS INC
Inventor： LAM LEO K , PHILLIPS EDWARD
Abstract: A method and apparatus for optical pumping of an NMR cell by means of laser light. A current driver provides an a.c. current waveform as injection current to a laser diode. The resulting laser intensity spectrum closely approximates the absorption spectrum of the cell to thereby increase the signal generated for a given power input.
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公开(公告)号：FR2729753B1
公开(公告)日：1997-08-14
申请号：FR9001505
申请日：1990-02-09
Applicant: LITTON SYSTEMS INC
Inventor： HALL DAVID BARNETT , LAM LEO K
IPC: G01C19/66
Abstract: Disclosed herein is a multi-pole magnetic geometry for a multi-oscillator ring laser gyroscope. Multi-pole magnetic geometry configurations are disclosed which are useful for providing Faraday rotation where the multi-oscillator uses a Faraday rotator and high magnetic field effect where the nature of the multi-oscillator ring laser gyroscope is of split gain configuration. The multi-post magnetic geometry includes a plurality of top or bottom loaded diametrically opposed north and south pole axially directed magnets which are positioned substantially transverse to the optical pathway but suitable for providing axially directed magnetic fields to portions of the optical pathway only where desired. The multi-pole magnetic geometry disclosed herein substantially produces a magnetic flux that is restricted in its position to localized portions of the optical pathway with low far field effects.
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公开(公告)号：GB2302203A
公开(公告)日：1997-01-08
申请号：GB8928719
申请日：1989-12-20
Applicant: LITTON SYSTEMS INC
Inventor： HALL DAVID B , LAM LEO K
IPC: G01C19/66
Abstract: Multi-pole magnetic geometry configurations are disclosed which are useful for providing Faraday rotation where the multi-oscillator uses a Faraday rotator 52 and high magnetic field effect where the nature of the multi-oscillator ring laser gyroscope is of split gain configuration. The multi-post magnetic geometry includes a plurality of top or bottom loaded diametrically opposed north and south pole axially directed magnets 44, 46, 48, 56 which are positioned substantially transverse to the optical pathway 54 but suitable for providing axially directed magnetic fields to portions of the optical pathway 54 only where desired. The multi-pole magnetic geometry substantially produces a magnetic flux that is restricted in its position to localized portions of the optical pathway with low far field effects. Each magnet can be rotated about its axis to tune the gyroscope.
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公开(公告)号：CA2080846A1
公开(公告)日：1994-11-12
申请号：CA2080846
申请日：1992-10-19
Applicant: LITTON SYSTEMS INC
Inventor： MARTIN GRAHAM J , LAM LEO K
Abstract: A triaxial multioscillator for operation in accordance with a mode of operation requiring the imposition of a substantially uniform axial magnetic field on the gain region of each lasing cavity. An integral frame of glass ceramic material has a rhombic dodecahedral shape and includes three closed lasing cavities, each formed of four straight segments. The cavities include three mutually parallel segments, one from each cavity, that are regularly spaced on a circle perpendicular to the axis of the frame. An internal cathode and six anodes are associated with the frame to provide gain in each of such three segments. The frame is positioned within a closed cylindrical element of soft iron composition by means of a fixture. The fixture positions magnets adjacent the top and bottom of the element to generate parallel lines of magnetic flux therein. The frame is positioned within the container in such a way that the cavity segments containing the three gain regions are aligned with the parallel lines of flux to produce the requisite axial fields in the three gain regions.
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