Method of manufacturing light emitting device

A method of manufacturing a light emitting device, the method comprising:

• providing a light source comprising one or more semiconductor laser elements configured to emit light, the one or more semiconductor laser elements comprising a first semiconductor laser element;
• locating an optical member above the light source, the optical member comprising one or more lens parts, each corresponding to a respective one of the one or more semiconductor laser elements, the one or more lens parts comprising a first lens part corresponding to the first semiconductor laser element;
• locating a condensing lens above the optical member;
• locating a photodetector above the optical member;
• causing at least the first semiconductor laser element to emit light;
• detecting, using the photodetector, light that has been emitted from the first semiconductor laser element and that has passed through the first lens part and the condensing lens;
• determining a reference detection position of the light detected by the photodetector;
• locating a first light-shielding member between the optical member and the condensing lens;
• shielding, by the first light-shielding member, a portion of light that has passed through the first lens part;
• detecting, using the photodetector, a remaining portion of light that has passed through the first lens part, the light-shielding member, and the condensing lens;
• and
• determining a post-shielding detection position of the remaining portion of light detected by the photodetector;
• based on the reference detection position and the post-shielding detection position, adjusting a distance between the light source and the optical member such that, when the remaining portion of light is detected by the photodetector to obtain a third detection position, the third detection position approaches or coincides with the reference detection position;
• and
• securing the optical member and the light source to each other.