[24p-D215-1~7] CS.2 Code-sharing Session of 3.5 & 3.14

△ [24p-D215-5] 234 nm deep ultraviolet second harmonic generation from SrB₄O₇ microcavity

〇(D)Tomoaki Nambu¹, Yasunori Tanaka¹, Yusuke Mori¹, Masashi Yoshimura², Syuhei Ichikawa¹, Yasufumi Fujiwara¹, Ryota Ishii³, Yoichi Kawakami³, Masahiro Uemukai¹, Tomoyuki Tanikawa¹, Ryuji Katayama¹ (1.Osaka Univ., 2.ILE, Osaka Univ., 3.Kyoto Univ.)

Keywords:SHG, microcavity, SBO

We have proposed an ultracompact microcavity wavelength conversion device. Its unique design exploits the simple principle that the wavelength conversion efficiency is proportional to the square of the electric field amplitude of enhanced pump light in the microcavity, and expands the range of suitable device materials to include crystals that do not exhibit birefringence or ferroelectricity. Here, as a first step toward practical applications of all-solid-state ultracompact deep-ultraviolet coherent light sources, we adopted a low-birefringence paraelectric SrB₄O₇ crystal with great potential for wavelength conversion and high transparency down to 130 nm as our device material, and demonstrated 234 nm deep-ultraviolet coherent light generation, whose wavelength band is expected to be used for on-demand disinfection tools that can irradiate the human body. Our demonstration represents a milestone in solid-state optics and opens routes to practical applications of all-solid-state ultracompact deep-ultraviolet coherent light sources covering the vacuum ultraviolet region.