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Optical oscillation device and recording apparatus

A recording equipment and optical technology, applied in the fields of recording equipment and optical oscillation devices, can solve the problems of increased cost and proportional increase of high-frequency superposition circuits.

Inactive Publication Date: 2013-01-23
SONY CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method may lead to an increase in device size proportional to the added high-frequency superposition circuit, which may lead to an increase in cost

Method used

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  • Optical oscillation device and recording apparatus
  • Optical oscillation device and recording apparatus
  • Optical oscillation device and recording apparatus

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Embodiment approach

[0105] Therefore, it can be known that the state of the self-excited oscillation semiconductor laser 1 can be switched between the ON state (during oscillation) and the OFF state (during non-oscillation) by switching the gain current between 250 mA and 0 mA. That is, the oscillating light beam emitted from the self-excited oscillation semiconductor laser 1 can be modulated by controlling the gain current. 2. First Embodiment (Example of Controlling Oscillation Frequency by DC Voltage During Oscillation)

[0106] A recording apparatus including the self-excited oscillation semiconductor laser 1 having the above features will be described below.

[0107] Figure 10 is a schematic diagram showing the configuration of the recording apparatus 100 according to the first embodiment. The recording apparatus 100 according to this embodiment includes an optical oscillation unit 110 and an objective lens 41 that converges an oscillation light beam emitted from the optical oscillation u...

no. 2 example

[0129] 3. Second Embodiment (Example of Controlling Oscillation Frequency by Direct Current During Oscillation)

[0130] In the first embodiment, the oscillation frequency of the self-excited oscillation semiconductor laser 1 is controlled using the reverse bias value during oscillation. However, if figure 2 As shown, the value of the gain current is also used to change the oscillation frequency of the self-excited oscillation semiconductor laser 1 . Hereinafter, a recording apparatus that uses a gain current to control the oscillation frequency of the self-excited oscillation semiconductor laser 1 will be described.

[0131] Figure 11 is a schematic diagram showing the configuration of the recording apparatus 200 according to the second embodiment. For the units corresponding to the units of the first embodiment (see Figure 10 ) use the same reference numerals, and their description will not be repeated.

[0132] The recording apparatus 200 according to this embodimen...

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Abstract

Provided is a recording apparatus including a self-excited oscillation semiconductor laser that has a double quantum well separate confinement heterostructure and includes a saturable absorber section to which a negative bias voltage is applied and a gain section into which a gain current is injected, an optical separation unit, an objective lens, a light reception element, a pulse detection unit, a reference signal generation unit, a phase comparison unit, a recording signal generation unit, and a control unit.

Description

technical field [0001] The present invention relates to an optical oscillation device emitting laser light and a recording apparatus using the same. Background technique [0002] In recent years, with the development of information technology (IT) in society, larger capacity and higher speed communication are necessary. Therefore, as for the medium used to propagate information, not only the optical communication technology of radio waves with frequencies such as 2.4GHz band and 5GHz band in radio communication but also the band with wavelengths such as 1.5μm (up to hundreds of THz frequencies) are used The optical communication technology of light has rapidly entered into widespread use. [0003] For example, a method of transmitting information by light is used not only for optical communication such as optical fiber communication, but also for recording and reproducing information on / from a recording medium. Therefore, optical information technology will become an impor...

Claims

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Application Information

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IPC IPC(8): G11B7/126G11B7/127H01S5/00H01S5/10
CPCH01S5/0658H01S5/0014H01S5/22H01S5/00H01S5/10G11B7/126G11B2007/00457H01S5/0265G11B7/127H01S5/34333H01S5/06226B82Y20/00
Inventor 藤田五郎丸山务
Owner SONY CORP