An objective of the present invention is to provide a surface emitting laser capable of selectively generating a laser oscillation in the fundamental mode and thereby emitting a single-wavelength laser light. In a surface emitting laser including an active layer and a two-dimensional photonic crystal provided on one side of the active layer, a reflector 45 or 46 is provided at least at a portion of the circumference of the two-dimensional photonic crystal. The reflector has a reflectance distribution in which the reflectance has a maximum value at a position where the amplitude envelope of the fundamental mode of an internal resonance light created within the two-dimensional photonic crystal. This design strengthens the fundamental mode while suppressing the second mode, thus enabling the laser oscillation in the fundamental mode to be selectively obtained, so that a single-wavelength laser light can be emitted.

It is possible to provide a surface emitting laser capable of selectively obtaining laser oscillation based on a basic mode, which enables emission of a laser light of single wavelength. A surface emitting laser including an active layer and a 2-dimensional photonic crystal provided at one side of the active layer has a reflection unit (45 or 46) arranged at least at a part of surrounding of the 2-dimensional photonic crystal. The reflection unit (45 or 46) has a reflection ratio distribution having a maximum value at a position where the envelope of the amplitude of the basic mode of the inner resonance light formed in the 2-dimensional photonic crystal has a maximum value. Thus, it is possible to strengthen the basic mode and suppress the secondary mode. Accordingly, it is possible to selectively obtain laser oscillation by the basic mode and emit a laser light of single wavelength.

An objective of the present invention is to provide a surface emitting laser capable of selectively generating a laser oscillation in the fundamental mode and thereby emitting a single-wavelength laser light. In a surface emitting laser including an active layer and a two-dimensional photonic crystal provided on one side of the active layer, a reflector 45 or 46 is provided at least at a portion of the circumference of the two-dimensional photonic crystal. The reflector has a reflectance distribution in which the reflectance has a maximum value at a position where the amplitude envelope of the fundamental mode of an internal resonance light created within the two-dimensional photonic crystal. This design strengthens the fundamental mode while suppressing the second mode, thus enabling the laser oscillation in the fundamental mode to be selectively obtained, so that a single-wavelength laser light can be emitted.