In this work we report a -24dB LP11 mode suppression in a 7+1 to 1 Backward Pump-Signal Combiner. The mode content is measured using the S2 -Measurement technique. The high signal beam quality is attributed to a low overlap splice loss between the Tapered Fiber Bundle and the output fiber. The combiner output fiber is large mode area with a LP01 mode effective area of 584 um2.
We report 6 kW pump limited power handling in a 7+1 to 1 Pump-Signal Combiner. The high pump transmission efficiency of 98% and optimal thermal management of the combiner package enables a low thermal slope of 0.0037 C/W measured up to 6 kW of pump power. The low thermal slope allows for a potential 9 kW pump power handling capacity of the 7+1 to 1 combiner.
In this work we demonstrate, a high brightness, high transmission Pump Signal Combiner (PSC) operating at 2.1 kW for 10 minutes mounted on a metal plate without running cooling water (Passively Cooled). The 6+1 to 1 PSC tested in this work has six 247 μm cladding diameter 0.22NA pump pigtails, a 10/125um signal pigtail and a 20/400um double clad output fiber. The combiners achieve a high pump transmission efficiency of 98%. During the passively cooled highpower test conducted at a power of 2.1 kW the maximum temperature recorded on the surface of the package was at a temperature of 38.5°C for 10min of power aging.
In this work we demonstrate a high transmission pump combiner that can operate uncooled at a maximum power of 400W for a continuous duration of 100hrs. The 7x1 pump combiner has seven 105/125 μm diameter 0.22 NA input pump fibers and a 247 μm diameter and 0.22 NA glass clad output fiber. The combiner has a high, 99%, pump transmission efficiency. These devices withstand without failure, a series of environmental stress tests, namely Thermal Cycling (-40 to 85ºC) and Damp Humidity (85ºC/85RH). These tests are conducted to uncover any latent defects in the device structure. The combiner’s also survive an elevated temperature of 75ºC at a power of 365W for duration of 5hrs, without any noticeable change in pump transmission.
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