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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
Published on: July 12, 2017
A Telluromolybdate Mid-Infrared Nonlinear Optical Crystal with Wide Transparency and Strong Second-Harmonic
Hanyue Zhou1, Wenli Zhao1, Huijian Zhao1
1State Key Laboratory of Crystal Materials, Tianjin Key Laboratory of Functional Crystal Materials, Institute of Functional Crystal, Tianjin University of Technology, Tianjin300384, China.
Abstract:
Nonlinear optical (NLO) crystals are fundamental to the development of all-solid-state laser technology, as they enable the extension of frequency ranges for coherent light generation. Herein, we report a novel mid-infrared (MIR) NLO telluromolybdate crystal, Cd13Mo4Te18O61 (CMTO), synthesized via a flux-assisted spontaneous crystallization process. CMTO adopts the Imm2 (No. 44) space group and features a variety of asymmetric building blocks. Notably, CMTO achieved a well-balanced combination of properties, including a large band gap of 3.04 eV, a wide transparency range of 0.29-6.0 μm and a strong second harmonic generation (SHG) response about 3 times as strong as that of KDP. Additionally, it possesses a suitable birefringence value of 0.135 at 1064 nm. First-principles calculations further elucidate that the optical activities of CMTO are predominantly influenced by Te-O and Mo-O polyhedral motifs. Collectively, these findings identify CMTO as a promising candidate for MIR NLO crystals.
