JP2010238350A5 - Laser light source device and optical head device - Google Patents
Laser light source device and optical head device Download PDFInfo
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- JP2010238350A5 JP2010238350A5 JP2009234519A JP2009234519A JP2010238350A5 JP 2010238350 A5 JP2010238350 A5 JP 2010238350A5 JP 2009234519 A JP2009234519 A JP 2009234519A JP 2009234519 A JP2009234519 A JP 2009234519A JP 2010238350 A5 JP2010238350 A5 JP 2010238350A5
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- 230000003287 optical effect Effects 0.000 title claims description 17
- 239000000463 material Substances 0.000 claims description 21
- 230000010287 polarization Effects 0.000 claims description 19
- 230000001678 irradiating effect Effects 0.000 claims description 2
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- 238000001514 detection method Methods 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Description
本発明は、媒体にレーザ光を照射するためのレーザ光源装置であって、レーザ光源と、偏光ビームスプリッタと、光量モニター用光検出器と、光軸を含む中心領域である第１の領域と、前記第１の領域の周辺において形成され、前記第１の領域より出射する光の偏光状態とは異なる偏光状態の光を出射する第２の領域とを有し、前記第１の領域と前記第２の領域のうち少なくとも一方は複屈折性材料により形成される空間分割位相差素子と、を有し、前記レーザ光源からの光を前記空間分割位相差素子に入射し、前記空間分割位相差素子における前記第１の領域を出射した光の一部は偏光ビームスプリッタにより偏向され前記光量モニター用光検出器に入射させ、前記第１の領域を出射した光の他の一部及び、前記第２の領域を出射する光は前記偏光ビームスプリッタを透過し前記媒体を照射することを特徴とする。 The present invention is a laser light source device for irradiating a medium with a laser beam , which comprises a laser light source, a polarization beam splitter, a light amount monitor photodetector, and a first region which is a central region including an optical axis. A second region formed around the first region and emitting light of a polarization state different from the polarization state of the light emitted from the first region, and the first region and the second region At least one of the second regions has a space division retardation element formed of a birefringent material, and light from the laser light source is incident on the space division retardation element, and the space division retardation is A part of the light emitted from the first area in the element is deflected by a polarization beam splitter and made incident on the light quantity monitoring photodetector, and the other part of the light emitted from the first area, and The light exiting region 2 is Kihenko transmitted through the beam splitter shines irradiation the medium, characterized in Rukoto.
また、本発明は、前記レーザ光源より前記空間分割位相差素子に照射される光束は、前記第１の領域よりも大きな面積であることを特徴とする。
また、本発明は、前記媒体は情報記録層が設けられている光ディスクであり、前記光ディスクにおいて情報の記録または再生を行うための光ヘッド装置において、前記記載のレーザ光源装置と、信号光用検出器と、を有し、前記第１の領域を出射した光の他の一部及び、前記第２の領域を出射する光は、前記偏光ビームスプリッタを透過し、前記光ディスクを照射し、前記光ディスクからの反射光は前記信号光用検出器に入射することを特徴とする。
Further, the present invention is characterized in that a light beam irradiated to the space division retardation element from the laser light source has a larger area than the first area.
Further, according to the present invention, in the optical head device for recording or reproducing information on the optical disc, the medium is an optical disc provided with an information recording layer, the laser light source device described above, and detection for signal light. And the other part of the light emitted from the first area and the light emitted from the second area pass through the polarizing beam splitter to illuminate the optical disc, and the optical disc Light reflected from the light source is incident on the signal light detector.
Claims (12)
レーザ光源と、
偏光ビームスプリッタと、
光量モニター用光検出器と、
光軸を含む中心領域である第１の領域と、前記第１の領域の周辺において形成され、前記第１の領域より出射する光の偏光状態とは異なる偏光状態の光を出射する第２の領域とを有し、前記第１の領域と前記第２の領域のうち少なくとも一方は複屈折性材料により形成される空間分割位相差素子と、を有し、
前記レーザ光源からの光を前記空間分割位相差素子に入射し、前記空間分割位相差素子における前記第１の領域を出射した光の一部は偏光ビームスプリッタにより偏向され前記光量モニター用光検出器に入射させ、
前記第１の領域を出射した光の他の一部及び、前記第２の領域を出射する光は前記偏光ビームスプリッタを透過し前記媒体を照射することを特徴とするレーザ光源装置。 A laser light source device for irradiating a medium with laser light , comprising:
Laser light source,
A polarization beam splitter,
A light detector for light intensity monitor ,
A second region which is formed in a first region which is a central region including an optical axis and in the periphery of the first region and which has a polarization state different from the polarization state of the light emitted from the first region A space division retardation element having a region, at least one of the first region and the second region being formed of a birefringent material,
The light from the laser light source is made incident on the space division phase difference element, and a part of the light emitted from the first area in the space division phase difference element is deflected by a polarization beam splitter and the light amount monitor photodetector Let
The other part of the first region light emitting and light exiting the second region is a laser light source device according to claim Rukoto pointing irradiation the medium passes through the polarization beam splitter.
前記第１の領域に入射する光に対する屈折率異方性と、第２の領域に入射する光に対する屈折率異方性とが異なることを特徴とする請求項１または請求項２に記載のレーザ光源装置。 Each of the first region and the second region includes a birefringent material,
The laser according to claim 1 or 2, wherein the refractive index anisotropy for light incident on the first area and the refractive index anisotropy for light incident on the second area are different. Light source device.
前記第１の領域のみに形成される第１の位相差板と、
前記第１の領域及び前記第２の領域に形成される第２の位相差板と、が重なることを特徴とする請求項１から３いずれかに記載のレーザ光源装置。 The space division phase difference element is
A first retardation plate formed only in the first region;
The laser light source device according to any one of claims 1 to 3, wherein a second retardation plate formed in the first area and the second area is overlapped.
前記複屈折性材料層における前記第１の領域と前記第２の領域との厚さが異なることを特徴とする請求項１から３いずれかに記載のレーザ光源装置。 The first region and the second region in the space division retardation element have a birefringent material layer formed of the same birefringent material,
The laser light source device according to any one of claims 1 to 3, wherein thicknesses of the first region and the second region in the birefringent material layer are different.
前記複屈折性材料層における前記第１の領域と前記第２の領域とは、厚さが同じであって、厚さ方向に揃った光学軸方向が互いに異なることを特徴とする請求項１から３いずれかに記載のレーザ光源装置。 The first region and the second region in the space division retardation element have a birefringent material layer formed of the same birefringent material,
The first region and the second region in the birefringence material layer have the same thickness, and the optical axis directions aligned in the thickness direction are different from each other. 3. The laser light source device according to any one of the above.
前記複屈折性材料層における前記第１の領域と前記第２の領域とは、光学軸が厚さ方向に捩れてなる角度が互いに異なることを特徴とする請求項１から３いずれかに記載のレーザ光源装置。 The first region and the second region in the space division retardation element have a birefringent material layer formed of a birefringent material,
The said 1st area | region and the said 2nd area | region in the said birefringence material layer mutually differ in the angle which an optical axis twists in thickness direction mutually, It is characterized by the above-mentioned. Laser light source device.
前記空間分割位相差素子面内の直線Ａを基準に、前記空間分割位相差素子に入射する直線偏光の光の偏光方向の角度をθｉｎ〔°〕とし、前記第１の領域における前記偏光方向に対する出射する直線偏光の光の偏光方向の角度をθｏｕｔ１〔°〕とし、前記空間分割位相差素子に入射する直線偏光の光の偏光方向を基準に、前記第１の位相差板における前記第１の領域の複屈折性材料層の遅相軸方向の角度をα１〔°〕とし、前記第２の位相差板における前記第１の領域の複屈折性材料層の遅相軸方向の角度をα２〔°〕とし、前記空間分割位相差素子に入射する波長λの光に対して、前記第１の位相差板における前記第１の領域の複屈折性材料層において生じる位相差をＲｅ１（λ）〔°〕とし、前記第２の位相差板における前記第１の領域の複屈折性材料層において生じる位相差をＲｅ２（λ）〔°〕とし、
前記直線Ａを基準に、前記第２の領域における前記偏光方向に対する出射する直線偏光の光の偏光方向の角度をθｏｕｔ２〔°〕とし、前記空間分割位相差素子に入射する直線偏光の光の偏光方向を基準に、前記第１の位相差板における前記第２の領域の複屈折性材料層の遅相軸方向の角度をα３〔°〕とし、前記第２の位相差板における前記第２の領域の複屈折性材料層の遅相軸方向の角度をα４〔°〕とし、前記空間分割位相差素子に入射する波長λの光に対して、前記第１の位相差板における前記第２の領域の複屈折性材料層において生じる位相差をＲｅ３（λ）〔°〕とし、前記第２の位相差板における前記第２の領域の複屈折性材料層において生じる位相差をＲｅ４（λ）〔°〕とした場合において、下記（１）から（６）に示す式
｜θｏｕｔ１−θｉｎ｜＝２×｜α１−α２｜・・・・・・・・・・・（１）
１５０＋３６０×ｍ１≦Ｒｅ１（λ）≦２１０＋３６０×ｍ１・・・・（２）
１５０＋３６０×ｎ１≦Ｒｅ２（λ）≦２１０＋３６０×ｎ１・・・・（３）
｜θｏｕｔ２−θｉｎ｜＝２×｜α３−α４｜・・・・・・・・・・・（４）
１５０＋３６０×ｍ２≦Ｒｅ３（λ）≦２１０＋３６０×ｍ２・・・・（５）
１５０＋３６０×ｎ２≦Ｒｅ４（λ）≦２１０＋３６０×ｎ２・・・・（６）
（ｍ１、ｎ１、ｍ２、ｎ２は、正の整数）を満たしていることを特徴とする請求項１から３のいずれかに記載のレーザ光源装置。 The space division retardation element is formed by overlapping a first retardation plate and a second retardation plate, and
The angle of the polarization direction of the linearly polarized light incident on the space division retardation element with respect to the straight line A in the plane of the space division retardation element is θin [°], and the angle with respect to the polarization direction in the first region is The angle of the polarization direction of the linearly polarized light to be emitted is θout 1 (°), and the first in the first retardation plate is based on the polarization direction of the linearly polarized light incident on the space division retardation element. The angle in the slow axis direction of the birefringent material layer in the region of is α 1 [°], and the angle in the slow axis direction of the birefringent material layer in the first region of the second retardation plate is and alpha 2 [°], for light of wavelength λ incident on the spatial division phase difference element, a phase difference caused in the birefringent material layers of the first region in the first retardation plate Re 1 (Λ) [°], and the first region in the second retardation plate A phase difference caused in the birefringent material layer and Re 2 (lambda) [°],
Based on the straight line A, the angle of the polarization direction of the linearly polarized light emitted with respect to the polarization direction in the second region is θout 2 [°], and the linearly polarized light incident on the space division retardation element The angle in the slow axis direction of the birefringence material layer of the second region in the first retardation plate is α 3 (°) with reference to the polarization direction, and the first retardation of the second retardation plate The angle in the slow axis direction of the birefringent material layer in the region 2 is α 4 (°), and the light of the wavelength λ incident on the space division retardation element is the light in the first retardation plate. The retardation generated in the birefringence material layer of the second region is Re 3 (λ) [°], and the retardation generated in the birefringence material layer of the second region in the second retardation plate is Re in 4 (lambda) when a [°], shown in the following (1) (6) | Θout 1 -θin | = 2 × | α 1 -α 2 | ··········· (1)
150 + 360 × m 1 ≦ Re 1 (λ) ≦ 210 + 360 × m 1 (2)
150 + 360 × n 1 ≦ Re 2 (λ) ≦ 210 + 360 × n 1 (3)
| Θout 2 −θin | = 2 × | α 3 −α 4 |... (4)
150 + 360 × m 2 ≦ Re 3 (λ) ≦ 210 + 360 × m 2 (5)
150 + 360 × n 2 ≦ Re 4 (λ) ≦ 210 + 360 × n 2 (6)
(M 1, n 1, m 2, n 2 is a positive integer) laser light source device according to any one of claims 1 to 3, characterized in that meets.
前記第１の領域及び前記第２の領域において、一方の偏光方向の光は透過し、前記一方の偏光方向の光と垂直な他方の偏光方向の光は回折されることを特徴とする請求項１から９のいずれかに記載のレーザ光源装置。 A diffraction grating is formed on one surface of the space division retardation element,
In the first area and the second area, light of one polarization direction is transmitted, and light of the other polarization direction perpendicular to the light of the one polarization direction is diffracted. The laser light source device according to any one of 1 to 9.
前記光ディスクにおいて情報の記録または再生を行うための光ヘッド装置において、 An optical head device for recording or reproducing information on the optical disc;
請求項１から１１のいずれかに記載のレーザ光源装置と、 The laser light source device according to any one of claims 1 to 11.
信号光用検出器と、を有し、 A detector for signal light;
前記第１の領域を出射した光の他の一部及び、前記第２の領域を出射する光は、前記偏光ビームスプリッタを透過し、前記光ディスクを照射し、前記光ディスクからの反射光は前記信号光用検出器に入射することを特徴とする光ヘッド装置。 The other part of the light emitted from the first area and the light emitted from the second area pass through the polarizing beam splitter to illuminate the optical disc, and the reflected light from the optical disc is the signal An optical head device characterized in that it is incident on a light detector.
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| JP2009234519A JP2010238350A (en) | 2009-03-12 | 2009-10-08 | Optical head device |
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| JP2009060190 | 2009-03-12 | ||
| JP2009234519A JP2010238350A (en) | 2009-03-12 | 2009-10-08 | Optical head device |
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| JP2010238350A JP2010238350A (en) | 2010-10-21 |
| JP2010238350A5 true JP2010238350A5 (en) | 2012-08-23 |
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| JP2015156242A (en) * | 2012-06-05 | 2015-08-27 | 三洋電機株式会社 | optical pickup device |
| JP7445094B2 (en) | 2021-11-09 | 2024-03-06 | カラーリンク・ジャパン 株式会社 | Optical laminates and optical devices |
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