|Budget Amount *help
¥241,150,000 (Direct Cost: ¥185,500,000、Indirect Cost: ¥55,650,000)
Fiscal Year 2012: ¥36,270,000 (Direct Cost: ¥27,900,000、Indirect Cost: ¥8,370,000)
Fiscal Year 2011: ¥76,050,000 (Direct Cost: ¥58,500,000、Indirect Cost: ¥17,550,000)
Fiscal Year 2010: ¥37,440,000 (Direct Cost: ¥28,800,000、Indirect Cost: ¥8,640,000)
Fiscal Year 2009: ¥39,650,000 (Direct Cost: ¥30,500,000、Indirect Cost: ¥9,150,000)
Fiscal Year 2008: ¥51,740,000 (Direct Cost: ¥39,800,000、Indirect Cost: ¥11,940,000)
We fabricated high-quality quantum-wire lasers, measured their carrier-density-dependent nonlinear optical gain, where we also characterized carrier densities, temperatures, and deviations from the thermal-equilibrium distribution. We clarified suppression effects of gain divergence at the 1D band edge and their mechanism of oscillator redistribution and broadening due to carrier-carrier interactions. We generated ps short pulses by gain switching and spectral filtering in semiconductor lasers, and investigated ultra-fast optical nonlinearities in the gain-switched lasers.