| Patent Number |
Title Of Patent |
Date Issued |
| 8194517 |
Hologram recording and reproducing device and method for recording hologram |
June 5, 2012 |
| A hologram recording and reproducing device controls an optical beam output from an external cavity semiconductor laser to improve a diffraction efficiency. The hologram recording and reproducing device includes an external cavity laser, a photodiode, a laser drive circuit and a lase |
| 8134765 |
Hologram recording and reconstruction apparatus |
March 13, 2012 |
| A hologram recording and reconstruction apparatus records and reconstructs a hologram in a recording layer of a holographic recording medium using a signal light beam and a reference light beam. The apparatus includes an objective lens, a spatial light modulator on which a reference |
| 8130620 |
Hologram recording/reproducing device, method thereof, and holographic recording medium |
March 6, 2012 |
| A hologram recording/reproducing device includes an optical section which irradiates a holographic recording medium with an optical beam; and a control unit which controls the optical section. The optical section includes a laser light source which emits the optical beam, and a spatial |
| 7969846 |
Hologram recording and reproducing device and method for recording hologram |
June 28, 2011 |
| A hologram recording and reproducing device controls an optical beam output from an external cavity semiconductor laser to improve a diffraction efficiency. The hologram recording and reproducing device includes an external cavity laser, a photodiode, a laser drive circuit and a lase |
| 7889407 |
Method for producing a duplicate hologram recording medium, apparatus for producing a duplicatio |
February 15, 2011 |
| An apparatus for producing a duplicate hologram recording medium includes: a positioning section configured to place the duplication master and the duplicate hologram recording medium at predetermined relative positions; an angle selective plate arranged between the duplication master an |
| 7808876 |
Hologram recording/reconstructing apparatus |
October 5, 2010 |
| A hologram recording/reconstructing apparatus includes a spatial modulator in which a reference beam region and a reconstruction beam region are formed, and a controller configured to control a range of the reference beam region and a range of the reconstruction beam region. According to |
| 7729400 |
External cavity type semiconductor laser |
June 1, 2010 |
| An external cavity type semiconductor laser that has a larger output and a more excellent single mode characteristic than a conventional external cavity type semiconductor laser is provided. The external cavity type semiconductor laser has a laser diode 11, a window glass 16, a grating, |
| 7580433 |
Laser system |
August 25, 2009 |
| A laser system includes a laser diode that oscillates in a multi-mode and has characteristics in which its oscillation wavelength varies with temperature, a grating that receives a light beam emitted from the laser diode and returns a diffracted beam to the laser diode, a mechanism that |
| 7502151 |
Holographic recording and reconstructing apparatus and method |
March 10, 2009 |
| A holographic recording and reconstructing apparatus includes a light source having a variable oscillation wavelength; a temperature sensing unit operable to sense temperature; and a control unit operable to record information about a temperature sensed by the temperature sensing unit on |
| 7426222 |
Laser apparatus |
September 16, 2008 |
| A laser apparatus is disclosed. An optical element receives at least a part of laser light emitted from a laser generation source and generates interference fringes. Each of first and second two-divided detectors has two detectors arranged in the direction of which the interference fring |
| 7366221 |
Laser apparatus and method of driving diffraction grating |
April 29, 2008 |
| A laser apparatus is disclosed. The laser apparatus has a diffraction grating that receives laser light from a semiconductor laser, emits first order diffracted light having a predetermined wavelength to the semiconductor laser, and reflects zero-th order light, a reflection section |
| 7310173 |
Hologram recording method, hologram recording reproduction method, hologram recording device, ho |
December 18, 2007 |
| In the hologram recording and hologram-record reproduction using a one-dimensional optical modulator, the one-dimensional optical modulator where a plurality of light-modulating pixels are arranged modulates a laser beam to record a digital-data signal on a hologram recording medium, |
| 4955007 |
Thermomagnetic recording method applying power modulated laser on a magnetically coupled double |
September 4, 1990 |
| Thermomagnetic recording method using a thermomagnetic recording medium having a superposed layer of magnetically coupled first and second magnetic thin films is disclosed. The magnetic thin film includes a portion where the respective magnetic moments of the first and second thin fi |
| 4878132 |
Thermomagnetic recording method applying power modulated laser on a magnetically coupled multi-l |
October 31, 1989 |
| A thermomagnetic recording method is disclosed using a thermomagnetic recording medium where first, second and third magnetic thin films each formed of rare-earth and transition metals are sequentially superposed to form layers in a magnetically coupled manner. The recording is carried o |
