Light source device, optical pickup, and recording device

摘要

A light source device configured as a master oscillator power amplifier includes a mode locked laser unit having an external resonator and a semiconductor optical amplifier that amplifies and modulates laser light emitted from the mode locked laser unit. The width in a lateral direction of a waveguide on an incident side of the semiconductor optical amplifier is set so that a horizontal lateral mode of the waveguide on the incident side of the semiconductor optical amplifier becomes multiple modes, and a magnification conversion unit that converts a magnification of incident light from the mode locked laser unit to the semiconductor optical amplifier is disposed so that a basic mode is selectively excited in optical coupling on the incident side of the semiconductor optical amplifier.

主权项

1. A light source device configured as a master oscillator power amplifier comprising:
a mode locked laser unit having an external resonator and emitting a laser light; and a semiconductor optical amplifier that amplifies and modulates laser light emitted from the mode locked laser unit, the semiconductor optical amplifier including a waveguide having a width in a lateral direction on an incident side of the semiconductor optical amplifier, the width being set so that a horizontal lateral mode of the waveguide on the incident side of the semiconductor optical amplifier becomes multiple modes; and a magnification conversion unit that is configured to magnify convert incident light from the mode locked laser unit to the semiconductor optical amplifier and is disposed so that a basic mode of the multiple modes is selectively excited when the magnification conversion unit is optically coupled to the incident side of the semiconductor optical amplifier.