Semiconductor laser element and method of manufacturing same

A method of manufacturing a semiconductor laser element, the method comprising:

• designing a laser section configured to cause light to perform laser oscillation and an amplification section configured to amplify the light;
• forming the laser section and the amplification section based on the designing of the laser section and the amplification section;
• forming a first anti-reflection coating on an end face of the laser section opposite to the amplification section with respect to the laser section;
• forming a second anti-reflection coating on an end face of the amplification section opposite to the laser section with respect to the amplification section,
• wherein the laser section and the amplification section include an active region, and
• wherein the designing is performed such that a power input to the active region in the amplification section is larger than a power input to the active region in the laser section.