Dr. Young K. Bae Profile

Dr. Young K. Bae

Chief Scientist at YK Bae Corp

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Proceedings Article | 26 August 2009 Paper

Propellantless precision formation flying with photonic laser thrusters for large space telescopes

Young Bae

Proceedings Volume 7436, 74360F (2009) https://doi.org/10.1117/12.824485

KEYWORDS: Mirrors, Satellites, Space operations, Control systems, Ranging, Space telescopes, Interferometry, Laser resonators, Crystals, Laser development

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One economically and technologically feasible bedrock structure for constructing large (diameter > 10 m) space telescopes is a segmented or sparse aperture system with subcomponents in precision formation flight. For UV/Visible/IR systems, initial targeting and targeting new objects to establish initial fringes requires the positioning precision to nm - μm accuracy, thus the control system should be capable of the required precision positioning and attitude controls without producing contaminations from thruster exhaust plumes. A nanometer accuracy contaminationfree formation architecture, Photon Tether Formation Flight (PTFF), based on Photonic Laser Thrusters (PLTs) and tethers has been proposed to exploit a force equilibrium formed by PLT thrust and tether tension for forming precision persistent 3-D formation structures ideal for the large UV/Visible/IR space telescopes. The range of the PLT force can theoretically extend over several kms. Under previous NASA sponsorship, we have successfully demonstrated a proofof- concept PLT. In addition, the demonstrations of required laser components, optics and tracking technologies developed under military laser applications now support that implementation of PLTs for large space telescopes is one step closer to reality.

Proceedings Article | 15 May 2008 Paper

First demonstration of photonic laser thruster (PLT)

Young Bae

Proceedings Volume 7005, 700510 (2008) https://doi.org/10.1117/12.782595

KEYWORDS: Mirrors, Optical resonators, Space operations, Reflectivity, Absorption, Laser applications, Crystals, Laser propulsion, Rockets, Laser resonators

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Photonic Laser Thruster (PLT) is an innovative photon thruster that amplifies photon thrust by orders of magnitude by exploiting an active resonant optical cavity formed between two mirrors on paired spacecraft. PLT is predicted to be able to provide the thrust to power ratio (T/P) approaching that of conventional thrusters, such as laser ablation thrusters and electrical thrusters. Yet, PLT has the highest I_sp of 3x10⁷ sec, which is orders of magnitude larger than that of other conventional thrusters. We have demonstrated the photon thrust amplification in PLT for the first time. The T/P obtained with an OC mirror with R= 0.99967±0.00002 was 20±1 μN/W, and the maximum photon thrust obtained was 35 μN, resulting in an apparent photon thrust amplification factor of 2,990±150. Scaling-up of PLT is promising, and PLT is predicted to enable wide ranges of space endeavors. Low thrust (T<N) PLTs may enable nanometer precision spacecraft formation for forming ultralarge space telescopes and radars, and provide economically viable solution to Fractionated Spacecraft Architecture, the System F-6. Medium thrust (N<T<kN) PLTs may enable precision propellantless orbit changing and docking. High thrust (T>kN) PLTs may enable propelling spacecraft at speeds orders of magnitude greater than that by conventional thrusters.

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