| Project/Area Number |
05559007
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
広領域
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
MINAMI Fujio Tokyo Institute of Technology, Dep.of Appl.Phys., Professor Cheif Researcher, 理学部, 教授 (30200083)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Yuichi Ouyou Kouden CO.,, 主任研究員
田中 祐一 応用光電研究室KK, 主任研究員
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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 |
¥8,200,000 (Direct Cost: ¥8,200,000)
Fiscal Year 1994: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1993: ¥7,400,000 (Direct Cost: ¥7,400,000)
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| Keywords | Cr^<4+> : YAG / tunable laser / 2photon resonance / GaAs / AlGaAs / quantum well / 半導体超格子 / InGaAsP |
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| Research Abstract |
In order to design a solid state Cr : YAG laser with 1.3-1.6 mum tuning range, we first constructed a Ti : sapphire laser system. Using an optimized Ti : sapphire laser and two-photon spectroscopy, we investigated ZnSe thin films and quantum wells. As a result, it is found that SHG signals in these materials manifest themselves in two-photon resonance with 1S and 2P excitons. We also showed that 2P exciton state has a fine structure caused by the coupling between the exciton envelope and the total hole spin.
Replacing a laser rod and mirrors, we made a Cr : YAG lase system pumped by Nd : YAG laser. At 8 W cw excitation, a tuning range from 1.38 mum to 1.58 mum was obtained and an average output power of 0.9 W was attained.
Next we confirm the pulse operation of this laser system. When pumped by a 5 W Q-switched Nd : YAG laser operating 3kHz, the laser had an average output power of 150 mW,a pulse duration of 100 ns and a tuning range of 1.38-1.58 mum. Using this laser system, we investigated the resonance SHG effects in GaAs/AlGaAs quantum wells. We observed an enhancement of SHG which occurs when the twice the incident photon energy is resonant with the 1S exciton state.
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