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公开(公告)号：US5172382A
公开(公告)日：1992-12-15
申请号：US651008
申请日：1991-02-05
CPC分类号： H01S5/1071 , H01S3/106 , H01S3/107 , H01S5/14
摘要： Polarization self-modulation of a laser produces high-frequency optical modulation without the use of high-speed electronics. This is accomplished by inserting into a laser cavity a polarization converter, which rotates the polarization of the laser light periodically as the light passes through the converter as it circulates in the cavity. The frequency of the modulation is determined by the cavity length. In one configuration, a quarter-wave retardation plate is used as the intracavity polarization converter in a Fabry-Perot laser. In a second embodiment, the converter is an electro-optic crystal which acts as an electronically-controllable half-wave retardation plate.
摘要翻译： 激光器的极化自调制可以在不使用高速电子设备的情况下产生高频光调制。 这通过在激光腔中插入偏振转换器来实现，该偏振转换器当光在腔中循环时通过转换器周期性地旋转激光的偏振。 调制频率由腔长决定。 在一种配置中，在法布里 - 珀罗激光器中使用四分之一波长的相位差板作为腔内偏振转换器。 在第二实施例中，转换器是用作电子可控半波延迟板的电光晶体。
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公开(公告)号：US5053641A
公开(公告)日：1991-10-01
申请号：US379781
申请日：1989-07-14
申请人： Lap K. Cheng , Walter R. Bosenberg , Chung L. Tang
发明人： Lap K. Cheng , Walter R. Bosenberg , Chung L. Tang
IPC分类号： G02F1/39
CPC分类号： G02F1/39
摘要： The operation of a .beta.-BaB.sub.2 O.sub.4 optical parametric oscillator is disclosed. The oscillator is tunable in the visible and near infrared. For example, a .beta.-BaB.sub.2 O.sub.4 crystal 10.5.times.10.5 nm.sup.2 .times.11.5 mm, cut at .theta.=30.degree. was pumped at 354.7 mm, and was tunable through 0.45-1.68 .mu.m, with a total energy conversion efficiency of 9.4%.
摘要翻译： 公开了β-BaB2O4光学参量振荡器的操作。 振荡器可见可见光和近红外。 例如，在θ= 30°切割的10.5×10 5 nm 2×11.5mm的β-BuB 2 O 4晶体以354.7mm泵送，并且可调谐为0.45-1.68μm，总能量转换效率为9.4％。
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公开(公告)号：US5579152A
公开(公告)日：1996-11-26
申请号：US375106
申请日：1995-01-19
IPC分类号： G02F1/39
CPC分类号： G02F1/39 , G02F2001/3542 , G02F2001/392
摘要： A broadly tunable femtosecond optical parametric generator includes a cavity having a pumping section in which is located a nonlinear crystal selected from the group CTA and RTA, cut for noncritical phasematching. The plane of the optical x axis and or the optical y axis of the crystal is aligned with the axis of the pumping section. A Ti:S laser pumping beam is directed into the pumping section either collinearly or noncollinearly with the pumping section axis and impinges on the crystal to produce signal and idler beams. The laser is tunable to produce OPO output beams between about 1 and 4 .mu.m.
摘要翻译： 广泛可调的飞秒光学参数发生器包括具有泵送部分的空腔，其中位于从CTA组和RTA组中选择的非线性晶体，用于非临界相互作用。 光学x轴的平面和/或晶体的光学y轴与泵送部分的轴线对准。 Ti：S激光泵浦光束与泵浦部分轴线共线或非共线地引导到泵送部分，并撞击在晶体上以产生信号和惰轮。 激光器可调，以产生约1至4微米的OPO输出光束。
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公开(公告)号：US5383198A
公开(公告)日：1995-01-17
申请号：US140503
申请日：1993-10-25
申请人： Wayne S. Pelouch , Peter E. Powers , Chung L. Tang
发明人： Wayne S. Pelouch , Peter E. Powers , Chung L. Tang
CPC分类号： H01S3/1112 , H01S3/0811 , H01S3/082 , H01S3/083 , H01S3/0943 , H01S3/105
摘要： A self-mode-locked ring cavity laser incorporating a laser crystal such as Ti:Sapphire includes an external cavity for producing self-starting of mode-locked operation. The external cavity receives a portion of one of the continuous wave beams from the ring cavity modulates it, and retroreflects it back to the ring cavity to initiate mode-locked unidirectional operation. The unidirectional mode-locked operation is in a direction which decouples the external cavity.
摘要翻译： 包含诸如Ti：Sapphire这样的激光晶体的自锁模环形腔激光器包括用于产生锁模操作的自启动的外部空腔。 外腔接收来自环形空腔的连续波束中的一个的一部分调制它，并将其反射回环形腔以启动锁模单向操作。 单向锁模操作是将外部空腔解耦的方向。
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公开(公告)号：US3961102A
公开(公告)日：1976-06-01
申请号：US505642
申请日：1974-09-13
IPC分类号： G02B5/18 , G03F7/00 , G03F7/20 , H01J37/305 , B05D3/06
CPC分类号： H01J37/3056 , G02B5/1857 , G03F7/001 , G03F7/2059
摘要： A method of making optical gratings by the use of a Scanning Electron Microscope wherein (1) a substrate having a thin film of electron resist thereon is exposed in adjacent areas by an electron dosage and the amount of such dosage and the depth of the thin film are selected such that energy deposition in regions between adjacent exposed areas in said electron resist is below the threshold sensitivity of said resist for development, (2) the development time of the resist is made an inverse function of the electron dosage, and/or (3) the period of the grating is controlled by use of a standard scanning format.
摘要翻译： 通过使用扫描电子显微镜制造光栅的方法，其中（1）具有其上的电子抗蚀剂薄膜的基底通过电子剂量暴露在相邻区域中，并且所述剂量的量和所述薄膜的深度 被选择为使得在所述电子抗蚀剂中的相邻曝光区域之间的区域中的能量沉积低于所述抗蚀剂显影的阈值灵敏度，（2）使抗蚀剂的显影时间成为电子用量的反函数，和/或（ 3）通过使用标准扫描格式控制光栅的周期。
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公开(公告)号：US5657119A
公开(公告)日：1997-08-12
申请号：US382261
申请日：1995-02-01
申请人： Shuichi Kawasaki , Randall J. Lane , Chung L. Tang
发明人： Shuichi Kawasaki , Randall J. Lane , Chung L. Tang
CPC分类号： G01N21/171 , G01N2021/1712
摘要： A thermal lens spectrometer utilizes a continuously tunable optical parametric oscillator (OPO) to provide practical, easy-to-build, reliable spectrometer for measuring a wide variety of sample materials over a wide spectral range. A flow cell is placed in the path of the output beam from a tunable optical parametric oscillator, and material to be analyzed is placed in the cell. A laser probe beam is also directed into the cell coaxially with the OPO output beam. The OPO output beam acts as a pump, and the output probe beam from the cell is directed to an intensity sensor. The OPO is tuned over a selected frequency range, under computer control, for example, to produce an output probe beam having an intensity representing the spectral response of the material to be analyzed.
摘要翻译： 热透镜光谱仪利用连续可调光参量振荡器（OPO）提供实用，易于构建的可靠的光谱仪，用于在宽光谱范围内测量各种样品材料。 将流动池放置在来自可调谐光学参量振荡器的输出光束的路径中，并将要分析的材料放置在单元中。 激光探针光束也被引导到与OPO输出光束同轴的单元中。 OPO输出光束用作泵，来自单元的输出探测光束被引导到强度传感器。 例如，在计算机控制下，将OPO调谐在选定的频率范围上，以产生具有表示待分析材料的光谱响应的强度的输出探测光束。
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公开(公告)号：US5033057A
公开(公告)日：1991-07-16
申请号：US455179
申请日：1989-12-22
申请人： Walter R. Bosenberg , Lap K. Cheng , Chung L. Tang
发明人： Walter R. Bosenberg , Lap K. Cheng , Chung L. Tang
IPC分类号： G02F1/39
CPC分类号： G02F1/39
摘要： An optical parametric oscillator capable of operating in the 0.300 to 0.400 micrometer wavelength range is disclosed. The oscillator includes a cavity defined at its ends by a pair of cavity resonator mirrors. A nonlinear optical crystal is positioned on the optical axis of the cavity intermediate the mirrors and is rotatable about a crystalline axis to tune the oscillator. A pair of pump steering mirrors are mounted in the cavity, one mirror between each resonator mirror and the corresponding end of the crystal. A source of pumping energy supplies energetic light to the cavity, the pumping beam being directed into the cavity and onto a first steering mirror, thence through the crystal and to the second steering mirror which then directs the pumping beam out of the cavity. The pumping beam may be at a wavelength of 266 nm, for example, to produce an output wave from the oscillator within the range of interest.
摘要翻译： 公开了能够在0.300至0.400微米波长范围内工作的光学参量振荡器。 振荡器包括在其端部由一对空腔谐振器反射镜限定的空腔。 非线性光学晶体位于反射镜之间的空腔的光轴上并且可以围绕晶体轴线旋转以调谐振荡器。 一对泵转向镜安装在空腔中，每个谐振镜与晶体的相应端之间有一个反射镜。 泵送能量源向空腔提供能量光，泵浦光束被引导到空腔中并进入第一转向镜，然后通过晶体和第二转向镜，然后将泵送光束引导出空腔。 例如，泵浦光束可以在266nm的波长处，以在感兴趣的范围内产生来自振荡器的输出波。
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8.发明授权
公开(公告)号：US5017806A
公开(公告)日：1991-05-21
申请号：US507444
申请日：1990-04-11
IPC分类号： G02F1/39
CPC分类号： G02F1/39
摘要： A tunable, singley-resonant optical parametric oscillator provides femtosecond light pulses in the infrared wavelength band. The oscillator includes an internally mounted thin crystal of KTiOPO.sub.4 which is synchronously pumped by femtosecond pulses from a colliding-pulse passively mode-locked dye laser. Rotation of the crystal varies the wavelength of the oscillator. Prisms within the oscillator cavity control group velocity dispersion to limit pulse width, and the oscillator as stabilized by a feedback network which varies the length of the cavity in response to spectral changes.
摘要翻译： 可调谐的单谐振光学参量振荡器在红外波长带中提供飞秒光脉冲。 该振荡器包括一个内部安装的KTiOPO4薄晶体，它由来自冲击脉冲被动锁模染料激光器的飞秒脉冲同步泵浦。 晶体的旋转会改变振荡器的波长。 振荡器腔内的棱镜控制组速度色散以限制脉冲宽度，并且振荡器由反馈网络稳定，响应于光谱变化而改变空腔的长度。
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公开(公告)号：US4537990A
公开(公告)日：1985-08-27
申请号：US478601
申请日：1983-03-24
摘要： This invention relates to growing single crystals of urea having increased dimensions on the 110-110 faces by physically restricting growth of the 111 faces of a seed crystal while precipitating urea from a saturated alcoholic solution containing ammonium bromide. In addition, this invention relates to a seed crystal holder adapted to modify crystal habit during crystal growth.
摘要翻译： 本发明涉及通过物理上限制晶种的111面的生长，同时从含有溴化铵的饱和醇溶液中沉淀尿素，生长出在110-110个面上具有增加的尺寸的尿素单晶。 此外，本发明涉及适于在晶体生长期间改变晶体习性的晶种保持器。
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公开(公告)号：US5406408A
公开(公告)日：1995-04-11
申请号：US212709
申请日：1994-03-14
CPC分类号： G02F1/37 , G02F1/39 , G02F2001/3542
摘要： A Ti:sapphire-pumped intracavity-doubled optical parametric oscillator generates up to 240 mW of sub100 femtosecond pulses tunable in the visible. The OPO consists of a 1.5 mm thick KTP crystal configured in a linear or a ring cavity which is synchronously pumped by a self-mode-locked Ti:sapphire laser. Intracavity doubling of the OPO is accomplished by inserting a .beta.-barium borate crystal into an additional focus in the OPO cavity. Continuous tuning of the second harmonic signal from 580 to 657 nm is obtained, with a potential tuning range being approximately 500 to 800 nm.
摘要翻译： Ti：蓝宝石泵浦腔内双光学参量振荡器可产生高达240 mW的可见光可调的sub 100飞秒脉冲。 OPO由配置在线性或环形空腔中的1.5 mm厚的KTP晶体组成，通过自锁型Ti：蓝宝石激光器同步泵浦。 OPO的腔内倍增是通过将β-硼酸钡晶体插入OPO腔中的附加焦点来实现的。 获得了从580到657nm的二次谐波信号的连续调谐，其中电位调谐范围是大约500到800nm。
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