-
公开(公告)号：DE69104808T2
公开(公告)日：1995-04-27
申请号：DE69104808
申请日：1991-11-04
Applicant: IBM
Inventor： LENTH WILFRIED , RISK WILLIAM PAUL
IPC: G02F1/37 , G11B7/125 , G11B7/135 , H01S3/082 , H01S5/06 , H01S5/065 , H01S5/0687 , H01S5/14 , H01S3/109 , H01S3/085 , G11B7/00
Abstract: A laser diode with a low reflectivity output facet provides infrared light to a nonlinear crystal resonator such that a portion of the infrared light is converted to blue light. A mirror is located on the opposite side of the nonlinear crystal resonator from the laser. The mirror allows the blue light to pass, but reflects the infrared light exiting the resonator back through the resonator and into the laser diode. The laser diode is thereby locked at the resonance frequency of the nonlinear crystal resonator.
-
公开(公告)号：CA1288156C
公开(公告)日：1991-08-27
申请号：CA571401
申请日：1988-07-07
Applicant: IBM
Inventor： BAUMERT JEAN-CLAUDE J E , BJORKLUND GARY C , LENTH WILFRIED , RISK WILLIAM P III , SCHELLENBERG FRANKLIN M
Abstract: WIDE TOLERANCE, MODULATED BLUE LASER SOURCE A process and apparatus are disclosed for producing a beam of coherent radiation at essentially 459 nm by mixing, in a nonlinear crystal consisting essentially of KTP, two laser beams, one at essentially 1064 nm and the other at essentially 808 nm. The 1064 nm radiation is derived from a Nd:YAG laser that consists of an input mirror, an output mirror and a Nd:YAG crystal, and contains also the KTP crystal. The Nd:YAG laser is pumped by an essentially 808 nm semiconductor diode laser beam, which passes through the input mirror and through the KTP crystal into the Nd:YAG laser crystal where it is absorbed. The 1064 nm radiation oscillating inside the Nd:YAG laser resonator is mixed either with the said 808 nm pump beam or with 808 nm radiation provided by a second semiconductor diode laser whose light is coupled with the 1064 nm beam using a beamsplitter. The essentially 459 nm beam passes through the output mirror to a utilization device.
-
公开(公告)号：CA2012401C
公开(公告)日：1994-05-10
申请号：CA2012401
申请日：1990-03-16
Applicant: IBM
Inventor： DEWEY ANTHONY G , LENTH WILFRIED , RUGAR DANIEL
Abstract: An apparatus and method is described for detecting focus errors in an optical head by positioning a prism in the optical path of a return light beam reflected from an optical recording medium. The prism reduces the beam in one dimension by a factor of M and concurrently increases the divergence/convergence angle associated with a focus-error of the beam by a factor of M in said dimension, thereby desirably enhancing the focus error signal by a factor of M2. A focus error is detected by a segmented photodetector having inner and outer photosensitive regions. The photodetector generates an electrical signal indicative of the focus error from the difference in light intensities at the inner and outer regions. The photodetector preferably is segmented in such manner as to also provide a track error signal.
-
公开(公告)号：AU626964B2
公开(公告)日：1992-08-13
申请号：AU4778690
申请日：1990-01-08
Applicant: IBM
Inventor： HARDER CHRISTOPH STEPHAN , RISK WILLIAM PAUL , MEIER HEINZ PETER , LENTH WILFRIED
IPC: G02F1/35 , G02F1/355 , G02F1/361 , G02F1/37 , H01S3/109 , H01S5/00 , H01S5/0687 , H01S5/40 , H01S3/30
Abstract: Apparatus and method for producing coherent blue-green-light radiation having a wavelength of essentially 490-500 nm. A diode laser (10), such as a strained-layer InGaAs/GaAs diode laser, provides a 980-1,000 nm beam (12), and a nonlinear crystal (19) of KTP (KTiOPO4) produces coherent radiation (22) by noncritically phase-matched second-harmonic generation (SHG) of said beam. The beam preferably has a wavelength of essentially 994 nm for generating radiation having a wavelength of essentially 497 nm. The crystal is disposed within an optical resonator (18) and the frequency of the laser is locked to that of the resonator. Alternatively, two diode lasers (10,11) are oriented to provide orthogonally polarized beams each with a wavelength of 980-1,000 nm but within essentially 1 nm of each other, and the KTP crystal is oriented with its a and c axes parallel to the orthogonally polarized beams. The KTP crystal may have an associated optical waveguide along which the beam is propagated to enhance SHG efficiency.
-
公开(公告)号：HK203896A
公开(公告)日：1996-11-15
申请号：HK203896
申请日：1996-11-07
Applicant: IBM
Inventor： HARDER CHRISTOPH STEPHAN , LENTH WILFRIED , MEIER HEINZ PETER , RISK WILLIAM PAUL
IPC: G02F1/35 , G02F1/355 , G02F1/361 , G02F1/37 , H01S3/109 , H01S5/00 , H01S5/0687 , H01S5/40 , H01S3/133
Abstract: Apparatus and method for producing coherent blue-green-light radiation having a wavelength of essentially 490-500 nm. A diode laser (10), such as a strained-layer InGaAs/GaAs diode laser, provides a 980-1,000 nm beam (12), and a nonlinear crystal (19) of KTP (KTiOPO4) produces coherent radiation (22) by noncritically phase-matched second-harmonic generation (SHG) of said beam. The beam preferably has a wavelength of essentially 994 nm for generating radiation having a wavelength of essentially 497 nm. The crystal is disposed within an optical resonator (18) and the frequency of the laser is locked to that of the resonator. Alternatively, two diode lasers (10,11) are oriented to provide orthogonally polarized beams each with a wavelength of 980-1,000 nm but within essentially 1 nm of each other, and the KTP crystal is oriented with its a and c axes parallel to the orthogonally polarized beams. The KTP crystal may have an associated optical waveguide along which the beam is propagated to enhance SHG efficiency.
-
Patent Agency Ranking
公开(公告)号：CA2061331C
公开(公告)日：1996-07-23
申请号：CA2061331
申请日：1992-02-17
Applicant: IBM
Inventor： KOZLOVSKY WILLIAM J , LENTH WILFRIED
IPC: H01S3/102 , G02F1/35 , G02F1/37 , H01S3/10 , H01S3/139 , H01S5/06 , H01S5/062 , H01S5/068 , H01S5/0687 , H01S3/133 , G11B7/125 , H01S3/13
Abstract: A laser diode produces a laser beam having a carrier frequency component and a sideband frequency component. An optical resonator receives the laser beam and substantially couples the carrier frequency component and substantially rejects the sideband frequency component. An electronic locking system receives the rejected sideband frequency component and adjusts the laser diode to lock the carrier frequency component to the resonator frequency. A laser control controls the allocation of power between the carrier frequency and the sideband frequency component such that the resonator output may be controlled and pulsed.
-
公开(公告)号：DE69016831D1
公开(公告)日：1995-03-23
申请号：DE69016831
申请日：1990-05-21
Applicant: IBM
Inventor： DEWEY ANTHONY GEORGE , LENTH WILFRIED , RUGAR DANIEL
Abstract: An apparatus and method is described for detecting focus errors in an optical head by positioning a prism (17) in the optical path of a return light beam (14) reflected from an optical recording medium (16). The prism reduces the beam in one dimension by a factor of M and concurrently increases the divergence/convergence angle associated with a focus-error of the beam by a factor of M in said dimension, thereby desirably enhancing the focus error signal (FES) by a factor of M . A focus error is detected by a segmented photodetector (19) having inner and outer photosensitive regions. The photodetector generates an electrical signal indicative of the focus error from the difference in light intensities at the inner and outer regions. The photodetector preferably is segmented in such manner as to also provide a track error signal.
-
公开(公告)号：DE68925810T2
公开(公告)日：1996-09-26
申请号：DE68925810
申请日：1989-12-18
Applicant: IBM
Inventor： HARDER CHRISTOPH STEPHAN , LENTH WILFRIED , MEIER HEINZ PETER , RISK WILLIAM PAUL
IPC: G02F1/35 , G02F1/355 , G02F1/361 , G02F1/37 , H01S3/109 , H01S5/00 , H01S5/0687 , H01S5/40 , H01S3/133
Abstract: Apparatus and method for producing coherent blue-green-light radiation having a wavelength of essentially 490-500 nm. A diode laser (10), such as a strained-layer InGaAs/GaAs diode laser, provides a 980-1,000 nm beam (12), and a nonlinear crystal (19) of KTP (KTiOPO4) produces coherent radiation (22) by noncritically phase-matched second-harmonic generation (SHG) of said beam. The beam preferably has a wavelength of essentially 994 nm for generating radiation having a wavelength of essentially 497 nm. The crystal is disposed within an optical resonator (18) and the frequency of the laser is locked to that of the resonator. Alternatively, two diode lasers (10,11) are oriented to provide orthogonally polarized beams each with a wavelength of 980-1,000 nm but within essentially 1 nm of each other, and the KTP crystal is oriented with its a and c axes parallel to the orthogonally polarized beams. The KTP crystal may have an associated optical waveguide along which the beam is propagated to enhance SHG efficiency.
-
公开(公告)号：DE69016831T2
公开(公告)日：1995-08-10
申请号：DE69016831
申请日：1990-05-21
Applicant: IBM
Inventor： DEWEY ANTHONY GEORGE , LENTH WILFRIED , RUGAR DANIEL
Abstract: An apparatus and method is described for detecting focus errors in an optical head by positioning a prism (17) in the optical path of a return light beam (14) reflected from an optical recording medium (16). The prism reduces the beam in one dimension by a factor of M and concurrently increases the divergence/convergence angle associated with a focus-error of the beam by a factor of M in said dimension, thereby desirably enhancing the focus error signal (FES) by a factor of M . A focus error is detected by a segmented photodetector (19) having inner and outer photosensitive regions. The photodetector generates an electrical signal indicative of the focus error from the difference in light intensities at the inner and outer regions. The photodetector preferably is segmented in such manner as to also provide a track error signal.
-
公开(公告)号：AU623778B2
公开(公告)日：1992-05-21
申请号：AU5578490
申请日：1990-05-21
Applicant: IBM
Inventor： DEWEY ANTHONY GEORGE , LENTH WILFRIED , RUGAR DANIEL
Abstract: An apparatus and method is described for detecting focus errors in an optical head by positioning a prism (17) in the optical path of a return light beam (14) reflected from an optical recording medium (16). The prism reduces the beam in one dimension by a factor of M and concurrently increases the divergence/convergence angle associated with a focus-error of the beam by a factor of M in said dimension, thereby desirably enhancing the focus error signal (FES) by a factor of M . A focus error is detected by a segmented photodetector (19) having inner and outer photosensitive regions. The photodetector generates an electrical signal indicative of the focus error from the difference in light intensities at the inner and outer regions. The photodetector preferably is segmented in such manner as to also provide a track error signal.
-
-
-
-
-
-
-
-
-
Search Results
18
records
(took 0.018 seconds)
