Koji Kamiyama

Generation of blue coherent light from a continuous‐wave semiconductor laser using an organic crystal‐cored fiber

Efficient frequency doubling of a continuous‐wave semiconductor laser was attained by using a nonlinear optical fiber with a single crystal core of an organic 3,5‐dimethyl‐1‐ (4‐nitrophenyl)pyrazole. The second‐harmonic power generated with a 15 mm length of the fiber reached 0.16 mW from the incident 16.6‐mW fundamental laser power at 884 nm. Nonlinear optical properties of the crystal and a fabrication technique of the fiber are also reported.

Precise lens-assembly techniques based on adhesive bonding and hammering for compact 100GbE TOSA

Two precise lens-assembly techniques based on the adhesive bonding and hammering are proposed. These techniques allow us to realize a compact 100GbE TOSA 15.1 × 6.5 × 5.6 mm which is suitable for the QSFP28 form factor. The measured DC output powers are more than +4.0 dBm which fully achieve the target value of+1.0 dBm with the large margin.

Bulk periodically poled MgO:LiNbO/sub 3/ with high optical damage resistance

Summary form only given. We proposed and demonstrated a novel corona discharge method for the fabrication of bulk periodically poled MgO doped LiNbO/sub 3/ (PPMGLN). We successfully fabricated bulk PPMGLN with a period of 4.7 /spl mu/m for wavelength of 473 nm and 7.0 /spl mu/m for wavelength of 532 nm. Using this PPMGLN we have newly developed blue and green solid-state lasers and they have been used for high-speed color photographic printers in Digital Lab System FRONTIER. It is known that MgO doped LiNbO/sub 3/ (MgO-LN) substrate has high resistance to optical damage. However except for corona discharge method, it is generally difficult to fabricate the bulk PPMGLN. We have made clear of the mechanism of domain inversion of Z-cut MgO-LN.