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Solid-state lasers at 2.1 μm having many applications for medical surgery, atmospheric wind lidar, gas detection, material processing and pumping of mid-IR optical parametric oscillators are attracting great interest in the last years. Tm- and Ho-doped sesquioxides (Tm3+:Lu2O3, Tm3+:Sc2O3, Ho: 3+:Lu2O3 and others) having an extraordinary long-wavelength 2-μm luminescence band and a high thermal conductivity...
26 Gbit/s direct modulation of 1.3degm wavelength AlGaInAs/InP distributed feedback lasers with the ridge-waveguide structure (ridge width of 1.0degm) buried by the benzocyclobutene polymer was achieved. The high electrical bandwidth of more than 20 GHz was acquired with this ridge-waveguide structure. Consequently, a clear eye-opening with extinction ratio of 6 dB was confirmed in the measurement...
Yb3+:(YGd2)Sc2(GaAl2)O12 disordered ceramic has been fabricated. 2.9-W average power with an optical-to-optical efficiency of 44% was achieved in a continuous-wave operation. 112-fs pulse duration with 860-mW average power was also achieved in a mode-locked operation.
A diode-pumped Q-switched laser oscillator with a liquid-nitrogen-cooled Yb:YAG ceramics active mirror has been demonstrated. 7.5-mJ pulse energy and 30-W average power were obtained. The maximum optical and slope efficiency were 62% and 71%, respectively.
A distributed reflector (DR) laser consisting of an active DFB section and a passive DBR section was realized by modulating widths of wirelike active regions. A threshold current as low as 1.5 mA, a differential quantum efficiency from the front facet of 21% and a sub-mode suppression ratio (SMSR) over 50 dB were realized for a stripe width of 3.4 /spl mu/m and a DFB section length of 150.
A RT-CW operation of GaInAsP/InP 5-stacked quantum-wire lasers (23 nm wide) fabricated by EB lithography, CH/sub 4//H/sub 2/-RIE and OMVPE regrowth was achieved. No significant changes in performance were observable even after 7100 h under the RT-CW condition.
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