Second harmonic generation in GaN transverse quasi-phase-matched waveguide pumped with femtosecond laser
| Autor: | Naoki Yokoyama, Yoshiki Morioka, Tomotaka Murata, Hiroto Honda, Kazunori Serita, Hironaru Murakami, Masayoshi Tonouchi, Shigeki Tokita, Shuhei Ichikawa, Yasufumi Fujiwara, Toshiki Hikosaka, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Applied Physics Express. 15:112002 |
| ISSN: | 1882-0786 1882-0778 |
| Popis: | A wavelength conversion device with an input grating coupler that enables easy alignment was fabricated using a vertically polarity inverted GaN layer. The device was excited with a femtosecond laser, and a second harmonic wave with a peak wavelength of 438.4 nm was obtained. A normalized wavelength conversion efficiency of 4.7 × 10−4% W−1 and a spectral bandwidth of the second harmonic wave of 2.9 nm were comparable to the theoretical estimations taking into account serious walk-off and waveguide losses. High efficiency of 33%–34% W−1 can be expected under continuous-wave excitation. |
| Databáze: | OpenAIRE |
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