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.
In a recent experimental study, we investigated a homemade distributed side-coupled cladding-pumped (DSCCP) fiber using a master oscillator power amplifier (MOPA) configuration and tandem-pumping technique. During the experiment, we observed an abnormal behavior of the residual pump power from the counter port of the pump core. This abnormal behavior exhibited a threshold-like characteristic, with both the residual power and corresponding power ratio to injected pump starting to increase exponentially above a specific value. Specifically, when the pump power injected into the system ranged from 7.2 kW to 11.77 kW, the corresponding residual power ratio increased from 4.05% to 11.01%. Simultaneously, the signal optical-to-optical conversion efficiency decreased from 84.11% to 75.33%. This sudden appearance of the phenomenon significantly limits the ability to further scale the power of the system. However, the underlying mechanism causing this abnormal behavior remains unclear and requires further investigation.
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