| Project/Area Number |
05452198
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
電子デバイス・機器工学
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
TAKAGI Keiji Kyushu Inst.of Tech.Dept.of Electrical Eng., Professor, 工学部, 教授 (90005281)
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| Co-Investigator(Kenkyū-buntansha) |
SERIKAWA Seiichi Kyushu Inst.of Tech.Dept.of Electrical Eng., Assistat, 工学部, 助手 (60226686)
MIZUNAMI Toru Kyushu Inst.of Tech.Dept.of Electrical Eng., Asst.Prof., 工学部, 助教授 (00174029)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 1994: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1993: ¥4,500,000 (Direct Cost: ¥4,500,000)
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| Keywords | Laser / Fluctuation / Noise / Low-frequency / Stabilization / 1 / f |
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| Research Abstract |
A system for analyzing low frequency light fluctuation is set up with amonochromator (MC50N) and multi-channel detector (Hamamatsu C2326). The multi-channel detector includes a PCD Image Sensor which has 256 sensing elements. The light output of a laser diode is divided into various wavelengths and the light spectral intensities are obtained at various wavelengths. The current noise is also measured. The noises show 1/f spectra. This can explained by the superposition of the Lorentzian spectra. The correlation coefficient between the light and the driving current was calculated from the measured values in single- and multi-mode operations. The optical feedback was carried out to the laser diode and the noise reduction was demonstrated. The mode-hopping noise and mode partition noise would often occur in multi-mode operation on the light output of laser diodes. Employing this analyzing system, more detailed study including the current dependence of the noise will be carried out and the 1/f noise problem should be studied more intensively in the low ferquency range including the other semiconductor devices.
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