公开(公告)号：US4841389A

公开(公告)日：1989-06-20

申请号：US60578

申请日：1987-06-11

申请人： Roger F. Hoyt ,  Carl M. Jefferson ,  Steven E. Millman

发明人： Roger F. Hoyt ,  Carl M. Jefferson ,  Steven E. Millman

IPC分类号： G01B7/02 ,  G01B7/00 ,  G11B5/60 ,  G11B19/04 ,  G11B21/21

CPC分类号： G11B5/6005 ,  G11B19/04

摘要： A self-diagnostic method and apparatus is described for indicating the likelihood of an impending crash of a magnetic transducer or head with a rotating magnetic medium by dynamically and periodically calculating overwrite efficiency for performing a desired control operation when it exceeds a preselected value denoting dangerous proximity of the transducer to the surface of the medium.

公开(公告)号：US06654183B2

公开(公告)日：2003-11-25

申请号：US09917370

申请日：2001-07-27

申请人： Hans J. Coufal ,  John A. Hoffnagle ,  Carl M. Jefferson

发明人： Hans J. Coufal ,  John A. Hoffnagle ,  Carl M. Jefferson

IPC分类号： G02B1318

CPC分类号： G02B19/0057 ,  G02B13/18 ,  G02B19/0014 ,  G02B27/09 ,  G02B27/0927 ,  G02B27/0944 ,  G02B27/0955 ,  G03F7/70075

摘要： An optical beam transformation system includes a first and a second optical element, each of which has a non-reentrant surface. The system transforms a substantially non-uniform optical input beam (such as a Gaussian) to a substantially uniform output beam. The first and second optical elements are arranged in either a Keplerian or Galilean configuration. The aspheric surface of the second optical element is related to the aspheric surface of the first optical element by a ray-tracing function that maps substantially all of an input light beam that is incident on the first optical element to a collimated output light beam that is output from the second optical element. Preferably, the output light beam has a Fermi-Dirac intensity distribution, and the ray-tracing function maps the input light beam to the output beam out to the (1/e)6 intensity radius of the input light beam.

摘要翻译： 光束转换系统包括第一和第二光学元件，每个光学元件具有非凹入表面。 系统将基本上不均匀的光输入光束（例如高斯）转换成基本均匀的输出光束。 第一和第二光学元件以开普勒或伽利略配置布置。 第二光学元件的非球面通过光线跟踪功能与第一光学元件的非球面相关，该光线跟踪功能将入射在第一光学元件上的输入光束基本上全部映射到准直的输出光束 从第二光学元件输出。 优选地，输出光束具有费米 - 迪拉克强度分布，并且光线跟踪功能将输入光束映射到输入光束的输出光束的（1 / e）6强度半径。

公开(公告)号：US5297076A

公开(公告)日：1994-03-22

申请号：US902621

申请日：1992-06-23

申请人： Carl M. Jefferson ,  Alfred J. Meixner

发明人： Carl M. Jefferson ,  Alfred J. Meixner

IPC分类号： G11C13/04

CPC分类号： G11C13/04

摘要： Phase modulation is used to record data in a spectral hole burning material. A laser and a phase modulator are used to generate both a reference pulse and a phase modulated data pulse to the material. The data is recorded as spectral holes in the absorption spectrum of the material. In order to read the data, a second reference pulse is generated which creates an echo pulse from the material. This echo pulse is combined with a frequency shifted comparator pulse in order to generate a heterodyne signal. A phase sensitive demodulator detects the phase transitions in the heterodyne signal and generates a digital signal representative of the data recorded.

摘要翻译： 相位调制用于在光谱孔燃烧材料中记录数据。 使用激光器和相位调制器来产生对材料的参考脉冲和相位调制数据脉冲。 数据被记录为材料的吸收光谱中的光谱孔。 为了读取数据，产生第二个参考脉冲，从而产生来自材料的回波脉冲。 该回波脉冲与频移比较器脉冲组合以产生外差信号。 相位敏感解调器检测外差信号中的相位变化，并产生代表所记录数据的数字信号。

公开(公告)号：US06801368B2

公开(公告)日：2004-10-05

申请号：US10679058

申请日：2003-10-02

申请人： Hans J. Coufal ,  John A. Hoffnagle ,  Carl M. Jefferson

发明人： Hans J. Coufal ,  John A. Hoffnagle ,  Carl M. Jefferson

IPC分类号： G02B1318

CPC分类号： G02B19/0057 ,  G02B13/18 ,  G02B19/0014 ,  G02B27/09 ,  G02B27/0927 ,  G02B27/0944 ,  G02B27/0955 ,  G03F7/70075

摘要： An optical beam transformation system includes a first and a second optical element, each of which has a non-reentrant surface. The system transforms a substantially non-uniform optical input beam (such as a Gaussian) to a substantially uniform output beam. The first and second optical elements are arranged in either a Keplerian or Galilean configuration. The aspheric surface of the second optical element is related to the aspheric surface of the first optical element by a ray-tracing function that maps substantially all of an input light beam that is incident on the first optical element to a collimated output light beam that is output from the second optical element. Preferably, the output light beam has a Fermi-Dirac intensity distribution, and the ray-tracing function maps the input light beam to the output beam out to the (1/e)6 intensity radius of the input light beam.

摘要翻译： 光束转换系统包括第一和第二光学元件，每个光学元件具有非凹入表面。 系统将基本上不均匀的光输入光束（例如高斯）转换成基本均匀的输出光束。 第一和第二光学元件以开普勒或伽利略配置布置。 第二光学元件的非球面通过光线跟踪功能与第一光学元件的非球面相关，该光线跟踪功能将入射在第一光学元件上的输入光束基本上全部映射到准直的输出光束 从第二光学元件输出。 优选地，输出光束具有费米 - 迪拉克强度分布，并且光线跟踪功能将输入光束映射到输入光束的输出光束的（1 / e）6强度半径。