A fuel nozzle having a flow pathway including a smooth, sharp, or mitered bend prior to a nozzle tip is provided. In a spectral transmittance curve for an incident angle of 0\xb0, an average transmittance in a 450-600 nm range is 80% or more, a transmittance in a 700-1200 nm range is 2. The two laser power values respectively correspond to the two write channel signals.