Periodically poled lithium niobate ridge waveguides with high conversion efficiency for 2f‐to‐3f self‐referencing interferometer

• Published in: Electronics letters 2013-01, Vol.49 (2), p.145-146
• Main Authors: Hitachi, K., Ishizawa, A., Nishikawa, T., Asobe, M., Sogawa, T.
• Format: Article
• Language: English
• Subjects: carrier‐envelope‐offset‐locked frequency comb; Exact sciences and technology; frequency; frequency 250 MHz; Frequency conversion; harmonic generation, including high-order harmonic generation; Fundamental areas of phenomenology (including applications); high conversion efficiency; Laser optical systems: design and operation; LiNbO3; lithium compounds; low pulse energy; Modulation, tuning, and mode locking; Nonlinear optics; optical harmonic generation; Optics; periodically poled ridge waveguides; Physics; pitch size; ridge waveguides; second‐harmonic light; self‐referencing interferometer; supercontinuum light; third‐harmonic light
• ISSN: 1350-911X; 0013-5194; 1350-911X
• DOI: 10.1049/el.2012.3630

The generation of second‐ and third‐harmonic light with single‐ and dual‐pitch periodically poled lithium niobate ridge waveguides for achieving a carrier‐envelope‐offset‐locked frequency comb with low pulse energy is investigated. The wavelengths of both the second‐ and third‐harmonic light converted by short‐ and long‐wavelength components of supercontinuum spectra are precisely adjusted by selecting appropriate pitch size and controlling the temperature of the devices. The output powers of the second‐ and third‐harmonic light are 9.1 and 4.8 µW, respectively, when using a 2/3‐octave‐wide supercontinuum light generated by a 1.2 nJ laser pulse at a repetition rate of 250 MHz.