Increasing the Refractive Index of a Germanosilicate Planar Waveguide by Irradiation with an Infrared Ultrashort Pulse Laser.
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- KOUTA Hikaru
- Functional Materials Research Laboratories, NEC
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- URINO Yutaka
- Fiber Optic Devices Division, NEC Networks
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- HANADA Tadahiko
- Fiber Optic Devices Division, NEC Networks
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- HIRAO Kazuyuki
- Faculty of Engineering, Kyoto University
Bibliographic Information
- Other Title
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- レーザーオリジナル Increasing the Refractive Index of a Germanosilicate Planar Waveguide by lrradiation with an Infrared U1trashort Pulse Laser
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Abstract
Reported here is the use of the focused beam of an infrared ultrashort pulse laser (150 femtoseconds pulse width, 200 kHz repetition rate, 800 nm wavelength, and 100 μm/s scanning speed) to increase the refractive index of a germanium-doped silica-glass planar waveguide. The increase obtained, Δn, itself increases in proportion to increases in the laser intensity of the surface irradiation, and it saturates to 1.6 ∼ 1.8 × 10-3 at 2.2 TW/cm2, without producing any increase in insertion loss and birefringence. Further, no decay in the refractive index change is observed after annealing at 200 °C for 10 hours. Results show that ultrashort pulse lasers are more suitable than UV lasers as light sources for highly stable adjustment of the optical lengths of waveguide devices.
Journal
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- The Review of Laser Engineering
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The Review of Laser Engineering 30 (5), 251-254, 2002
The Laser Society of Japan
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Details
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- CRID
- 1390001204645552000
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- NII Article ID
- 10008508872
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- NII Book ID
- AN00255326
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- COI
- 1:CAS:528:DC%2BD38XlvVGqsbs%3D
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- ISSN
- 13496603
- 03870200
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- NDL BIB ID
- 6168256
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed