arXiv 2405.030532024-05-05physics.optics

使用相位控制光学频率梳的光学相控阵

Optical phased array using phase-controlled optical frequency comb

Takashi Kato, Kaoru Minoshima

AI总结：

本文提出一种利用相位控制光学频率梳的新型光学相控阵，通过控制梳齿的两个射频频率之比实现超短脉冲宽带波前控制，并实验验证了宽带光学点扫描与环境波动抑制。

摘要：

我们开发了一种使用光学频率梳的光学相控阵，并演示了其原理验证。近年来，光学相控阵作为一项无需任何机械装置即可控制光波前的技术得到了积极发展，类似于相控阵雷达。传统的光学相控阵已通过光学集成电路实现，但难以在简单控制下实现宽带工作。这是因为每个波长都需要对大量相位调制器进行控制和校准，而且波导的色散使得超短脉冲的全带宽相位控制变得困难。相比之下，我们开发了一种新型光学相控阵，利用光频梳的高可控性和采用自由空间光学元件的光学阵列天线，通过对光频梳进行相位控制来实现锁模激光器产生的超短脉冲的波前控制。该方法只需控制光频梳的两个射频频率之比，即可在抑制环境波动的同时实现宽带光学相控阵。实验通过形成光学点图案并控制光频梳频率来抑制环境波动，演示了在光学频率下的宽带光学点扫描。这项创新的光学技术能够直接通过光学频率控制波前，即通过纵模控制横模。

英文摘要：

We developed an optical phased array using an optical frequency comb and demonstrated its proof-of-principle. Optical phased arrays have been actively developed in recent years as a technology that can control the wavefront of light without any mechanical devices like phased array radar. Conventional optical phased arrays have been implemented using optical integrated circuits, but it has been difficult to achieve broadband operation with simple control. This is because control and calibration of a large number of phase modulators are required for each wavelength, and the dispersion of the waveguide makes whole bandwidth phase control of ultrashort pulses difficult. In contrast, we have developed a novel optical phased array that realizes wavefront control of ultrashort pulses generated by mode-locked laser by phase control of the comb, using high controllability of the comb and an optical array antenna with free-space optics. This is achieved by simply controlling the ratio of the two radio frequencies of the comb to realize a broadband optical phased array while suppressing environmental fluctuations. Experiments demonstrated broadband optical dot scanning at an optical frequency by forming an optical dot pattern and suppressing the environmental fluctuation by controlling the comb frequency. This innovative optical technology enables direct control of wavefronts by optical frequencies, i.e. controlling transverse modes by longitudinal modes.

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