| Project/Area Number |
06452130
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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 |
Applied optics/Quantum optical engineering
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| Research Institution | Shinshu University |
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Principal Investigator |
NOMURA Akio Fac.of Eng., Shinshu Univ., Prof., 工学部, 教授 (00115362)
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| Co-Investigator(Kenkyū-buntansha) |
NAGASAWA Chikao Fac.of Eng., Tokyo Metro.Univ., Prof., 工学部, 教授 (80145664)
SAITO Yasunori Fac.of Eng., Shinshu Univ., Associate Prof., 工学部, 助教授 (40135166)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥7,600,000 (Direct Cost: ¥7,600,000)
Fiscal Year 1995: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1994: ¥7,000,000 (Direct Cost: ¥7,000,000)
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| Keywords | space borne lidar / lidar / laser / remote sensing / atmospheric environment |
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| Research Abstract |
We have made basic studies on all solid state laser transmitting system for a satellite borne lidar for measuring the mesospheric sodium or potassium layr.
As for the laser for measuring sodium atom, Nomura and Saito have studed the generation of 589 nm (Na D_2 line) laser radiation with a LBO nonlinear crystal by sum frequency of 1319 nm and 1064 nm from one Nd ; YAG laser. In order to minimize the interaction between two laser radiations, the 1064 nm 1319 nm radiations propagated in the active medium with orthogonal polarization and composed separate cavities. At first, with a single YAG rod laser system, we confirmed to generate a 589 nm laser radiation. Moreover, we discussed some problems of high output power and high efficiency. Next, in order to improve the 1319 nm output, the 1319 nm cavity was changed to be composed of two YAG rods. Both cavity lengths were optimized so as to make same pulse width. By this laser system, it was found that the maximum sum frequency output of 589 nm was obtained at simultaneous laser radiation of 1064 nm and 1319 nm.
As for the laser for measuring potassium atom, Nagasawa studyed the system composed of Nd : YAG laser pumped Ti : saphirrer laser. That system gave the laser output of 20 mJ/pulse at a wavelength of 770 nm with a repetion rate of 10 Hz and a spectral width of 500 MHz. By composing the lidar system with that laser transmitter, it was verified that the laser system was enough to measure the mesopsheric potasium layr.
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