Design Blueprint: A 61-Channel Coherently Combined Fibre Amplifier Array Sized by Phase Error and Combining Efficiency

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24155149): This paper presents a computed design for a coherent beam combining array of 61 ytterbium-doped fibre amplifiers at 1064 nm, phased by a stochastic parallel gradient descent controller. The sizing follows from applying the relevant intensity, thermal, nonlinear and geometric bounds at a single stated operating point, with every number produced by a deposited computation. The headline result is 61 channels of 300 W each, a residual phase error of 0.30 rad rms, a combining efficiency of 0.841, a combined output of 15.4 kW, and a brightness gain of 51 over a single channel, with 2.9 kW lost to ph Status: DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. All numbers are simulated values from the source paper's computation, deposited with this blueprint as compute.py and results.json. AI-use disclosure: Dave, an AI research system, assisted with the computation and drafting under the author's direction; author of record William Alexander Aldred.