The effective pumping factor for various Laser Diodes (LDs) is defined to explain the absorption characteristic of wavelength-stable LDs (WS-LDs). This factor is used to determine wavelength locking points and residual pump power. We evaluated the wavelength locking ability and residual pump power in quantity using two groups of comparable LDs and a narrow linewidth fiber laser. Prior to running LDs in a fully wavelength-locked state, the maximum residual pump power is observed at low pump power levels. This information can be useful in engineering applications for establishing appropriate cooling standards for CPS heat load. Additionally, it is valuable for WS-LD manufacturers to provide a universal evaluation factor for assessing different LDs and guiding wavelength locking quantity enhancement.
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