Wavelength conversion device

A wavelength conversion device that converts a wavelength by second harmonic-wave generation and generates a laser beam, comprising:

• a substrate having a plurality of electrodes;
• a semiconductor laser device electrically connected to the plurality of electrodes;
• and
• a nonlinear optical element having an optical waveguide for guiding a laser beam emitted from the semiconductor laser device and for converting a wavelength of the laser beam,
• wherein the semiconductor laser device, the optical waveguide of the nonlinear optical element, and the plurality of electrodes are on approximately one line on the substrate.

A wavelength conversion device that converts a wavelength by second harmonic-wave generation and generates a laser beam, comprising:

• a substrate having a plurality of electrodes;
• a semiconductor laser device mounted on the substrate and including three regions of a gain region, a phase control region, and a wavelength control region;
• and
• a nonlinear optical element mounted on the substrate and for converting a wavelength of a laser beam emitted from the semiconductor laser device,
• wherein the plurality of electrodes include a first electrode group formed corresponding to the three regions and a second electrode group for carrying out wire-bonding with an external power source,
• the three regions of the semiconductor laser device are connected electrically to the respective electrodes in the first electrode group, and the first electrode group further is connected to the respective electrodes in the second electrode group via wires, and
• a wire among the wires, which is connected between the phase control region and the wavelength control region of the semiconductor laser device, has a portion functioning as a resistor.