公开(公告)号：US5384884A

公开(公告)日：1995-01-24

申请号：US50194

申请日：1993-05-04

Applicant: Raman Kashyap ,  Robert J. Campbell

Inventor： Raman Kashyap ,  Robert J. Campbell

IPC: G02B5/18 ,  G02B6/02 ,  G02B6/10 ,  G02B6/34

CPC classification number: G02B6/02128

Abstract: An optical fibre is fixed between a clamp and a piezo-electric translation stage. An argon ion laser emitting at 514.5 nm is used to write Bragg gratings in the fibre. A different longitudinal stress is applied to the fibre before optically writing each Bragg grating. The fibre when unstressed will have a Bragg grating of different peak reflectivity corresponding to the number of different applied stresses.

Abstract translation: PCT No.PCT / GB91 / 01968 Sec。 371日期：1993年5月4日 102（e）日期1993年5月4日PCT 1991年11月8日PCT PCT。 公开号WO92 / 08999 日期：1992年5月29日。光纤固定在夹具和压电平移台之间。 在514.5nm发射的氩离子激光用于在光纤中写入布拉格光栅。 在光学写入每个布拉格光栅之前，对光纤施加不同的纵向应力。 不受应力时的光纤将具有不同峰值反射率的布拉格光栅，其对应于不同施加应力的数量。

公开(公告)号：US20150205044A1

公开(公告)日：2015-07-23

申请号：US14595772

申请日：2015-01-13

Applicant: Raman Kashyap

Inventor： Raman Kashyap

IPC: G02B6/245 ,  G02B6/36

CPC classification number: G02B6/245

Abstract: This invention relates to the modifying or stripping of primary or secondary coatings on optical fibres by the application of heat such that the coating is entirely or partially removed from the surface over a given length of an optical fibre while a tension is applied in the fibre. Also a clamp to hold the optical fibre when tension is applied.

Abstract translation: 本发明涉及通过施加热量来改变或剥离光纤上的初级或次级涂层，使得在光纤中施加张力时，涂层在给定长度的光纤上完全或部分地从表面上移除。 还有一个钳子，用于在施加张力时保持光纤。

公开(公告)号：US20120312028A1

公开(公告)日：2012-12-13

申请号：US13469635

申请日：2012-05-11

Applicant: Raman KASHYAP ,  Galina NEMOVA

Inventor： Raman KASHYAP ,  Galina NEMOVA

IPC: F25B21/00

CPC classification number: F25B23/00

Abstract: Methods for cooling fluorescent material are provided. A first method includes providing a sample of the material having an elongated direction of light propagation, exhibiting fluorescence at a mean fluorescence wavelength and capable of emitting superradiant pulses with a formation delay time. The method then involves generating a pump pulsed laser beam having a wavelength longer than the mean fluorescence wavelength, a pump power at which superradiant pulses are emitted and a pulse duration shorter than the formation delay time. The pulses are directed onto the sample along the direction of light propagation to produce the superradiant pulses in an anti-Stokes process inducing a cooling of the sample. A second laser cooling method includes a combination of a traditional anti-Stokes cooling cycle and an upconversion cooling cycle, wherein the two cooling cycles act cooperatively to cool the sample.

Abstract translation: 提供了用于冷却荧光材料的方法。 第一种方法包括提供具有细长的光传播方向的材料的样品，以平均荧光波长显示出荧光并且能够发射具有形成延迟时间的超辐射脉冲。 该方法然后涉及产生具有比平均荧光波长长的波长的泵脉冲激光束，发射超辐射脉冲的泵浦功率和比形成延迟时间短的脉冲持续时间。 沿着光传播的方向将脉冲引导到样品上，以在反斯托克斯方法中产生超辐射脉冲，引起样品的冷却。 第二激光冷却方法包括传统的反斯托克斯冷却循环和上变频冷却循环的组合，其中两个冷却循环协同工作来冷却样品。

公开(公告)号：US20100061689A1

公开(公告)日：2010-03-11

申请号：US12514743

申请日：2007-11-13

Applicant: Raman Kashyap ,  Vincent Treanton

Inventor： Raman Kashyap ,  Vincent Treanton

IPC: G02B6/10 ,  B29D11/00

CPC classification number: G02B6/136

Abstract: The present invention is concerned with a process for fabricating a buried optical waveguide, comprising providing a multi-layer piece of material having a waveguide core layer, generating a laser beam and producing by ablation at least two trenches by applying the laser beam onto the multi-layer piece of material. The two trenches extend through the multi-layer piece of material including the core layer. Upon the ablation, melted material from the multi-layer piece is produced and the core layer is encapsulated between the two trenches with the melted material to produce the buried optical waveguide in the multi-layer piece of material. The present invention also relates to a buried optical waveguide comprising a multi-layer piece of material having a waveguide core layer, at least two trenches laser ablated through the multi-layer piece of material including the core layer and encapsulating material having melted from the multi-layer piece upon laser ablation and leaked to cover and therefore encapsulate the core layer in the at least two trenches to thereby form the buried optical waveguide.

Abstract translation: 本发明涉及一种用于制造掩埋光波导的方法，包括提供具有波导芯层的多层材料片材，产生激光束并通过将激光束施加到多个多孔体上来消融至少两个沟槽产生 层材料。 两个沟槽延伸通过包括芯层的多层材料片。 在消融时，产生来自多层件的熔融材料，并且利用熔化的材料将芯层封装在两个沟槽之间，以在多层材料中产生掩埋光波导。 本发明还涉及一种掩埋光波导，其包括具有波导芯层的多层材料片材，至少两个激光器通过包括芯层的多层材料烧蚀并且从多层熔化的封装材料 激光烧蚀并且漏出以覆盖并因此将芯层封装在至少两个沟槽中，从而形成掩埋光波导。

公开(公告)号：US06284437B1

公开(公告)日：2001-09-04

申请号：US09051122

申请日：1998-04-01

Applicant: Raman Kashyap

Inventor： Raman Kashyap

IPC: G02B616

CPC classification number: G02B6/02152 ,  G02B6/02085 ,  G02B6/02133 ,  G02B6/02138

Abstract: A device for recording a refractive index pattern in a photosensitive optical fiber includes a rotary disc formed with a phase mask in a circular pattern, which is rotated by an axis. The phase mask is illuminated with laser light in a region so that a moving interference pattern is formed. The optical fiber is moved along a path in synchronism with the moving interference pattern so that the pattern becomes recorded in the fiber. The pattern can be formed continuously over long fiber lengths, e.g., of the order of one meter.

Abstract translation: 用于在光敏光纤中记录折射​​率图案的装置包括：旋转盘，其形成有以轴为中心旋转的圆形图案的相位掩模。 在一个区域中用激光照射相位掩模，从而形成移动的干涉图案。 光纤沿着与移动干涉图案同步的路径移动，使得图案被记录在光纤中。 该图案可以在长纤维长度上连续地形成，例如大约一米。

公开(公告)号：US06229945B1

公开(公告)日：2001-05-08

申请号：US09372038

申请日：1999-08-11

Applicant: Benjamin J Ainslie ,  Douglas L Williams ,  Graeme D Maxwell ,  Raman Kashyap ,  Jonathan R Armitage

Inventor： Benjamin J Ainslie ,  Douglas L Williams ,  Graeme D Maxwell ,  Raman Kashyap ,  Jonathan R Armitage

IPC: G02B602

CPC classification number: G02B6/021 ,  C03B19/1453 ,  C03B37/01853 ,  C03B2201/31 ,  C03C3/06 ,  C03C3/076 ,  C03C4/04 ,  C03C13/045 ,  C03C2201/31 ,  C03C2203/50 ,  G02B6/02133 ,  G02B6/124

Abstract: It has been demonstrated that B containing glasses are sensitive to radiation in the band 225-275 nm and, therefore, B2O3 glasses are particularly adapted to receive refractive index modulation, e.g., to make reflection gratings. Glasses containing SiO2 and B2O3 are particularly suitable when the grating is to be localized in the cladding of a fiber. Glasses containing SiO2, GeO2, and B2O3 are suitable when the grating is in the path region of a waveguide, e.g., in the core of a fiber.

Abstract translation: 已经证明含B玻璃对225-275nm波段的辐射敏感，因此B 2 O 3玻璃特别适于接收折射率调制，例如制造反射光栅。 当光栅定位在纤维的包层中时，含有SiO 2和B 2 O 3的玻璃特别适合。 当光栅位于波导的路径区域中时，例如在纤维的芯中，含有SiO 2，GeO 2和B 2 O 3的玻璃是合适的。

公开(公告)号：US6094291A

公开(公告)日：2000-07-25

申请号：US68959

申请日：1998-05-20

Applicant: Raman Kashyap

Inventor： Raman Kashyap

IPC: G02F1/01 ,  G02F1/015 ,  G02F1/035 ,  G02F1/03

CPC classification number: G02F1/0115 ,  G02F1/011 ,  G02F1/0126 ,  G02F1/035 ,  G02F2001/0113 ,  G02F2001/0153

Abstract: An optical modulator includes a bi-moded fiber for supporting first and second different optical transmission modes, coupled between input and output single mode fibers. The two modes in the bi-moded fiber interfere and the intensity of the radiation that passes to the single mode output fiber is a function of the relative phases of the first and second modes. The bi-moded fiber is electrically poled and is provided with modulating electrodes. When a modulating voltage from a modulating source is applied to the electrodes, the refractive index of the waveguide for the first transmission mode is altered relative to the refractive index of the waveguide for the second mode such as to change the phase difference between the modes at the entrance to the output fiber so as to control the intensity of optical radiation that passes through the output fiber.

Abstract translation: PCT No.PCT / GB98 / 01010 Sec。 371日期：1998年5月20日 102（e）日期1998年5月20日PCT提交1998年4月6日PCT公布。 第WO98 / 47041号公报 日期1998年10月22日光调制器包括用于支持第一和第二不同光传输模式的双模光纤，耦合在输入和输出单模光纤之间。 双模光纤中的两种模式干扰，并且传递到单模输出光纤的辐射强度是第一和第二模式的相对相位的函数。 双模光纤被电极化并且设置有调制电极。 当来自调制源的调制电压被施加到电极时，用于第一传输模式的波导的折射率相对于用于第二模式的波导的折射率而改变，以改变模式之间的相位差 输出光纤的入口，以便控制通过输出光纤的光辐射的强度。

公开(公告)号：US6041069A

公开(公告)日：2000-03-21

申请号：US877997

申请日：1997-06-18

Applicant: Raman Kashyap ,  Jonathan Richard Armitage

Inventor： Raman Kashyap ,  Jonathan Richard Armitage

IPC: G02B5/18 ,  G02B6/00 ,  G02B6/02 ,  G02B6/124 ,  G02B6/13 ,  G02B6/34 ,  H01S3/067 ,  H01S3/30

CPC classification number: G02B6/02133 ,  G02B5/18 ,  G02B6/124 ,  G02B6/34 ,  H01S3/0675 ,  G02B6/02085 ,  G02B6/29322

Abstract: A resonant laser device including first and second reflectors defining an optical cavity with given optical resonance characteristics. The laser device including a laser active material in a first optical fiber disposed between the reflectors in the cavity and a second photosensitive optical fiber coupled to the cavity. One of the reflector being a refractive index grating formed in the second fiber such that the laser operates with a selected predetermined wavelength and the laser being tuned to a different wavelength by exposing the second fiber to a second spatially periodic pattern of optical radiation such that the second pattern becomes recorded in the second optical fiber.

Abstract translation: 一种谐振激光器件，包括第一和第二反射器，其限定具有给定光学谐振特性的光学腔。 所述激光装置包括位于所述空腔中的所述反射器之间的第一光纤中的激光活性材料和耦合到所述空腔的第二感光光纤。 反射器中的一个是形成在第二光纤中的折射率光栅，使得激光器以选定的预定波长进行操作，并且通过将第二光纤暴露于第二空间周期性的光学辐射图案将激光器调谐到不同的波长，使得 第二图案被记录在第二光纤中。

公开(公告)号：US5832011A

公开(公告)日：1998-11-03

申请号：US522424

申请日：1995-10-10

Applicant: Raman Kashyap

Inventor： Raman Kashyap

IPC: G02B6/02 ,  G02B6/34 ,  G02B6/42 ,  H01S3/067 ,  H01S5/00 ,  H01S5/022 ,  H01S5/14 ,  H04B10/02 ,  H04B10/28 ,  H01S3/10

CPC classification number: H01S5/146 ,  G02B6/421 ,  G02B6/4292 ,  H01S3/0675 ,  H01S3/094003 ,  H01S3/09415 ,  H01S3/1608 ,  H01S5/02284

Abstract: A laser having two feedback elements at least one which is wavelength selective, is provided with a demountable optical connector located between the gain medium of the laser and the wavelength selective feedback element. An optical waveguide is utilized to direct optical radiation between the demountable optical connector and the wavelength selective feedback element. The demountable optical connector, for example, a mechanical fibre connector allows the wavelength selective feedback element, for example, a fibre grating, to be exchanged cheaply, simply and quickly, and thus allows the wavelength of operation of the laser to be altered.

Abstract translation: PCT No.PCT / GB94 / 00556 Sec。 371 1995年10月10日第 102（e）日期1995年10月10日PCT 1994年3月18日PCT公布。 第WO94 / 22187号公报 日期1984年9月29日具有两个具有波长选择性的至少一个的反馈元件的激光器设置有位于激光器的增益介质和波长选择反馈元件之间的可拆卸光连接器。 使用光波导来引导可拆卸光连接器和波长选择反馈元件之间的光辐射。 可拆卸的光学连接器例如机械光纤连接器允许波长选择反馈元件（例如，光纤光栅）被廉价，简单且快速地交换，从而允许改变激光器的操作波长。

公开(公告)号：US5583689A

公开(公告)日：1996-12-10

申请号：US347298

申请日：1995-02-08

Applicant: Stephen Cassidy ,  Richard Wyatt ,  Raman Kashyap ,  Jonathan R. Armitage ,  Robert Campbell

Inventor： Stephen Cassidy ,  Richard Wyatt ,  Raman Kashyap ,  Jonathan R. Armitage ,  Robert Campbell

IPC: G02B5/18 ,  G02B5/20 ,  G02B5/28 ,  G02B6/124 ,  G02B6/34 ,  H01S3/06 ,  H01S3/07 ,  H01S3/10 ,  H04B10/294 ,  H01S3/00 ,  G02B27/00

CPC classification number: G02B6/02133 ,  G02B6/02085 ,  G02B6/02147 ,  G02B6/124 ,  G02B6/2931 ,  G02B6/29313 ,  G02B6/29319 ,  G02B6/29395 ,  H01S3/10023 ,  H04B10/2941 ,  H01S2301/04

Abstract: A filter has a preselected attenuation/wavelength characteristic, in which spatially separated parts of the filter attenuate different wavelengths. The spatially-separated parts have different attenuation characteristics to attenuate different wavelengths in a predetermined manner to provide a selected attenuation/wavelength characteristic. In one arrangement an interference type filter includes a grating, the pitch of which varies spatially. In one instance, the structure to determine the proportion of radiation subject to interference includes a grating of spatially-varying effectiveness, but alternatively it may include an attenuation filter, the attenuation effect of the attenuation layer varying spatially. In another arrangement, the filter may include structure to separate received radiation into a spatially-disposed spectrum, and to attenuate different parts of the spatially-disposed spectrum in such a manner as to provide the selected attenuation/wavelength characteristic.

Abstract translation: PCT No.PCT / GB93 / 01160 Sec。 371日期1995年2月8日 102（e）日期1995年2月8日PCT提交1993年6月1日PCT公布。 公开号WO93 / 24977 日期1993年12月9日一个滤波器具有预选的衰减/波长特性，其中滤波器的空间分离的部分衰减不同的波长。 空间分离的部分具有不同的衰减特性，以预定的方式衰减不同的波长，以提供选定的衰减/波长特性。 在一种布置中，干涉型滤波器包括其间距在空间上变化的光栅。 在一个实例中，确定受干扰的辐射比例的结构包括空间变化效应的光栅，但是也可以包括衰减滤波器，衰减层的衰减效应在空间上变化。 在另一种布置中，滤波器可以包括将接收的辐射分离成空间上放置的光谱的结构，并且以提供所选择的衰减/波长特性的方式衰减空间上放置的光谱的不同部分。