基于铌酸锂光波导的宽带超快脉冲表征(特邀)

Broadband Ultrashort Pulse Characterization Based on Lithium Niobate Waveguides(Invited)

基于铌酸锂光波导平台的横向-频域分辨光学开关方法已被证明具有精确、原位、全参量表征光子芯片中飞秒光脉冲的能力。因此,进一步验证了该种方法在超快脉冲表征技术的宽带工作特性。得益于横向光学二倍频的可宽带工作优势,该技术可以在非常宽的光谱范围(150 nm)内适用。实验结果表明,该种技术对不同波长光脉冲的原位测量均表现出了优异的灵敏度和信噪比。进一步地,该种方法成功测量了经光子晶体光纤展宽后的未知脉冲,显示出其在表征复杂光脉冲的应用潜力。

The transverse frequency-resolved optical gating(T-FROG)method based on a thin-film lithium niobate waveguide platform was previously proved to enable the accurate,in situ,and full-parameter characterization of waveguided femtosecond pulses inside integrated circuits.Herein,we confirm that the T-FROG method can operate over broadband spectra(e.g.,150 nm),which are benefited by the broadband operation characteristic features of transverse second-harmonic generation.Experimental results indicate that this method exhibits high sensitivity and signal-to-noise ratio for measuring pulses of various wavelengths.Furthermore,the proposed approach is applied to measure unknown pulses generated from a photonic crystal fiber,and the result indicates its potential for characterizing complex pulses.