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We demonstrate a sparse 3-channel Laser Phased Array (40 dBm/ch) locked to an ultra low-power (-55 dBm/ch) remote Beacon. We measured a combination efficiency ≥ 17% and 12 µs to peak power. In a nominal closed packed array the combining efficiency is about 62%. This demonstration is a key step in realizing directed energy for space applications.

We demonstrate a Yb-doped fiber amplifier (YDFA) designed for large aperture bidirectional laser phased arrays locked to a remote coherent Beacon. The amplifier is CW, single-mode (λ = 1064 nm), gain of 30 dB, high slope efficiency of 86 ± 2.2% extremely large dynamic range > 100 dB and broad temperature range with low residual phase noise of ≤ 30 mrad when the array is phase locked to the Beacon.