Surface-figuring of potassium dihydrogen phosphate crystals for the development of random continuous polarization wave plates

Nathaniel D. Urban; John A. Marozas; Kyle R. P. Kafka; David Weiner; Amy L. Rigatti; Kenneth L. Marshall; Ray Huff; Brittany N. Hoffman; Alexander Maltsev; Dylan B. Rykert; Ji-Mi Jang; Stavros G. Demos

doi:10.1117/12.3032776

18 December 2024 Surface-figuring of potassium dihydrogen phosphate crystals for the development of random continuous polarization wave plates

Nathaniel D. Urban, John A. Marozas, Kyle R. P. Kafka, David Weiner, Amy L. Rigatti, Kenneth L. Marshall, Ray Huff, Brittany N. Hoffman, Alexander Maltsev, Dylan B. Rykert, Ji-Mi Jang, Stavros G. Demos

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Proceedings Volume PC13190, Laser-Induced Damage in Optical Materials 2024; PC131900H (2024) https://doi.org/10.1117/12.3032776
Event: SPIE Laser Damage, 2024, San Ramon, CA, United States

Abstract

Polarization smoothing is an important method used to improve beam uniformity and on-target energy coupling during inertial confinement fusion experiments. First-generation polarization smoothing optics deployed in the ultraviolet section of the 60-beam OMEGA Laser System are based on potassium dihydrogen phosphate (KDP) wedges, which produce two diverging, orthogonally polarized beams. An upgrade to a random continuous polarizer (RCP) wave plate is desired that calls for an arbitrary distribution of polarization states. Imprinting a freeform depth profile into a birefringent crystal such as KDP is a promising approach for fabrication of a large-aperture RCP. Modern optical fabrication technologies are capable of imprinting these designs; however, the challenging material properties of KDP require new innovations in process and slurry chemistry. This presentation will discuss recent advances in our efforts to fabricate a KDP-RCP.

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Nathaniel D. Urban, John A. Marozas, Kyle R. P. Kafka, David Weiner, Amy L. Rigatti, Kenneth L. Marshall, Ray Huff, Brittany N. Hoffman, Alexander Maltsev, Dylan B. Rykert, Ji-Mi Jang, and Stavros G. Demos "Surface-figuring of potassium dihydrogen phosphate crystals for the development of random continuous polarization wave plates", Proc. SPIE PC13190, Laser-Induced Damage in Optical Materials 2024, PC131900H (18 December 2024); https://doi.org/10.1117/12.3032776

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KEYWORDS

Polarization

Crystals

Phosphates

Potassium

Picosecond phenomena

Wave plates

Fabrication

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