Kenichi Kubodera

Stable LiNdP 4 O 12 miniature laser

A miniature LiNdP(4)O(12) laser with a compact resonator is reported. Stable cw laser operation at 1.047 microm was obtained in a single-longitudinal and single-transverse mode by coaxial pumping with an argon laser (5145 A). Threshold pump power was 7.2 mW, and the maximum output power in the single-mode operation was 4 mW. The conditions for single-mode operation were considered in detail experimentally and theoretically.

Efficient LiNdP 4 O 12 lasers pumped with a laser diode

Efficient wavelength conversions into low-dispersion and low-loss regions of optical fibers are reported. (AIP)

Pure single-mode LiNdP 4 O 12 solid-state laser transmitter for 1.3-μm fiber-optic communications

A pure single-mode high-bit-rate solid-state laser transmitter was fabricated using a GaAlAs laser-pumped LiNdP(4)O(12) laser oscillator, a YIG isolator, and a LiNbO(3) traveling-wave directional-coupler waveguide modulator. Signal peak power of 0.17 mW coupled to an output single-mode fiber was obtained at 1.317-microm wavelength. Half-wavelength voltage was 6.0 V and 3-dB bandwidth was 2.8 GHz.

Epitaxial growth of KNdP4O12 laser waveguides

Abstract The growth of KNdP 4 O 12 and KLaP 4 O 12 single crystals from an H 3 PO 4 solution was accomplished with an evaporation and condensation technique. Using the solution from which KNdP 4 O 12 can crystallize, a KNdP 4 O 12 single-crystal epitaxial waveguide layer was successfully deposited on as-grown KLaP 4 O 12 substrates in the same manner. The layer on the (001) plane exhibited a good epitacial waveguide, and a 28 μm thick KNdP 4 O 12 waveguide laser was obtained.

Laser performance of an epitaxially grown KNdP4O12 waveguide

Abstract A laser operation in a waveguided mode at 1.051 μm is reported in a 28 μm thick and 0.72 mm long KNdP 4 O 12 layer epitaxially grown on a KLaP 4 O 12 substrate. The minimum value of the threshold pump power was 38.3 mW impinged on the crystal, when longitudinally pumped with a chopped 5145 A argon laser at room temperature.

Diode-pumped miniature solid-state laser: design considerations.

The LED-direct pumped laser was considered theoretically as a way to miniaturize solid state lasers. The pumping efficiency of the system was calculated numerically by 3-D ray tracing. For LiNdP(4)O(12), an efficient Nd stoichiometric material, the threshold power density and the pump power density necessary to obtain a 5-mW output power under optimum output coupling conditions were calculated to be 20 W/cm(2) and 60 W/cm(2), respectively, assuming a crystal size of 50 microm x 50 microm x 5 mm.

New cavity configurations of Nd:MgO:LiNBO3 self-frequency-doubled lasers

Abstract Two types of self-frequency-doubled Nd:MgO:LiNbO3 laser are demonstrated. Their oscillation polarization directions were controlled for second harmonic generation with new cavity configurations which are smaller than the conventional cavity configuration containing a Brewster window. The first laser uses an etalon effect to select the oscillation polarization direction. It emits 0.27 mW of green light (0.546 μm) from a single side of the cavity in quasi CW mode when the crystal absorbs 33 mW of pump light (0.813 μm) from a laser diode. The second laser has a monolithic cavity and the polarization selection is achieved with angle-walk-off caused by birefringence. It emits about 0.2 mW of green light in quasi CW mode when about 100 mW of pump light is incident. In addition to these experiments, the effectiveness of these polarization selection methods is numerically confirmed.