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21 August 2020 Continuous-wave laser operation based on triplet management of guest-host matrix
Buddhika S. B. Karunathilaka, Umamahesh Balijapalli, Chathuranganie A. M. Senevirathne, Yu Esaki, Toshinori Matsushima, Atula S. D. Sandanayaka, Chihaya Adachi
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Proceedings Volume 11473, Organic and Hybrid Light Emitting Materials and Devices XXIV; 114730A (2020) https://doi.org/10.1117/12.2568328
Event: SPIE Organic Photonics + Electronics, 2020, Online Only
Abstract
Triplet exciton accumulation and singlet-triplet annihilation (STA) are major issues, which makes continuous-wave (CW) operation difficult, in organic lasers. We synthesized an organic laser dye, 2,6-dicyano-1,1-diphenyl-λ5σ4-phosphinine (DCNP), having a small singlet-triplet energy gap. In DCNP-doped 4-4΄-bis[(N-carbazole)styryl] biphenyl (BSBCz) films, the triplets formed on DCNP are easily transferred to BSBCz, resulting in the suppressed STA and triplet accumulation. With this system, we demonstrated true-CW laser operation, with a low threshold and high photostability. Laser emission was further characterized by plane-polarized light output, far-field beam interference, exciton decay lifetime, and visible beam observed on an illuminance paper.
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Buddhika S. B. Karunathilaka, Umamahesh Balijapalli, Chathuranganie A. M. Senevirathne, Yu Esaki, Toshinori Matsushima, Atula S. D. Sandanayaka, and Chihaya Adachi "Continuous-wave laser operation based on triplet management of guest-host matrix", Proc. SPIE 11473, Organic and Hybrid Light Emitting Materials and Devices XXIV, 114730A (21 August 2020); https://doi.org/10.1117/12.2568328
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KEYWORDS
Continuous wave operation
Dye lasers
Excitons
Thin film devices
Crystals
Laser damage threshold
Laser systems engineering
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