| Presentation | 2014-01-24 Study on Speckle Contrast by Use of a Spectrum Broadened Laser Beam from a Semiconductor Laser with High-Frequency Signal Superposition Hiroshi Murata, Kazuhisa Yamamoto, Yasuyuki Okamura, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Laser displays and laser illuminations have been attracting a lot of interest owing to their excellent characteristics; wide color gamut, high color fidelity, and low-electrical-power consumption compared to conventional systems. These advantages of laser displays/illuminations essentially come from a laser's unique feature as a light source: very high coherence in both temporal and spatial domains. However, this high coherence may cause unwanted interference patterns on images, called "speckle noise." Reduction of speckle noise is a key issue in the further development and utilization of laser displays and illuminations. In this report, experimental results on speckle control by use of high-frequency signal superposition are presented. Speckle contrast of images generated by a red semiconductor laser was measured precisely utilizing the speckle measurement system with a cooled CCD camera and auto-power-level adjustments. By adopting 500MHz signal superposition to the red laser, the speckle contrast values were drastically reduced from 0.9 to 0.2. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Laser display / Optical modulation / Speckle / Speckle contrast |
| Paper # | PN2013-89,OPE2013-203,LQE2013-189,EST2013-138,MWP2013-109 |
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| Conference Information | |
| Committee | PN |
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| Conference Date | 2014/1/16(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Photonic Network (PN) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Study on Speckle Contrast by Use of a Spectrum Broadened Laser Beam from a Semiconductor Laser with High-Frequency Signal Superposition |
| Sub Title (in English) | |
| Keyword(1) | Laser display |
| Keyword(2) | Optical modulation |
| Keyword(3) | Speckle |
| Keyword(4) | Speckle contrast |
| 1st Author's Name | Hiroshi Murata |
| 1st Author's Affiliation | Graduate School of Engineering Science, Osaka University() |
| 2nd Author's Name | Kazuhisa Yamamoto |
| 2nd Author's Affiliation | Photon Pioneers Centre, Osaka University |
| 3rd Author's Name | Yasuyuki Okamura |
| 3rd Author's Affiliation | Graduate School of Engineering Science, Osaka University |
| Date | 2014-01-24 |
| Paper # | PN2013-89,OPE2013-203,LQE2013-189,EST2013-138,MWP2013-109 |
| Volume (vol) | vol.113 |
| Number (no) | 393 |
| Page | pp.pp.- |
| #Pages | 4 |
| Date of Issue | |