| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a technique related to optimization of the waveguide cross-sectional shape for improving the net gain in a laser element.SOLUTION: A laser element has a waveguide including a resonance structure for resonating electromagnetic wave. The waveguide includes a gain medium 103, a first negative permittivity medium 104 of a negative permittivity real part in contact with the gain medium, a second negative permittivity medium 102 of a negative permittivity real part in contact with the gain medium, and a side face structure 105 on a positive permittivity real part in contact with the side face of the gain medium, and held by the first and second negative permittivity media. The waveguide includes a section where the width w between the side faces of the gain media 103 is equal to or less than two times of the thickness h of the side face structure 105 held by the first and second negative permittivity media.</p> |
