20 GHz光纤集成飞秒脉冲和超连续谱产生与谐振电光频率梳

IF 5.4 1区 物理与天体物理 Q1 OPTICS APL Photonics Pub Date : 2023-11-20 DOI:10.1063/5.0165681
Pooja Sekhar, Connor Fredrick, David R. Carlson, Zachary L. Newman, Scott A. Diddams
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引用次数: 1

摘要

模式间隔为10-20 GHz的频率梳对于天文光谱仪校准、高速双梳光谱学和低噪声微波产生等日益重要的应用至关重要。虽然电光调制器和微谐振器可以提供这种重复频率的窄带梳状源,但仍然存在一个重大挑战,即如何产生具有足够峰值功率的脉冲,以启动自参考所需的跨越数百太赫兹(THz)的非线性超连续谱。在这里,我们提供了一个简单的,强大的,通用的解决方案来解决这个问题,使用现成的保偏放大器和非线性光纤组件。这种光纤集成的方法用于非线性时间压缩和超连续谱的产生,用1550 nm的谐振电光频率梳进行了演示。我们展示了如何在20 GHz的重复频率下轻松实现短于60秒的脉冲。同样的技术可以应用于10 GHz的皮秒脉冲,以证明时间压缩了9倍,并实现50 fs脉冲,峰值功率为5.5 kW。这些压缩脉冲通过多段色散定制的异常色散高度非线性光纤或钽波导传播后,可以产生超过600 nm的平坦超连续谱。同样的10ghz源可以很容易地在色散工程氮化硅波导中实现自参考的八度跨越频谱。这种简单的全光纤非线性频谱加宽方法填补了将任何窄带10-20 GHz频率梳转换为宽带频谱的关键空白,用于受益于高脉冲速率和需要访问单个梳模式的广泛应用。
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20 GHz fiber-integrated femtosecond pulse and supercontinuum generation with a resonant electro-optic frequency comb
Frequency combs with mode spacing of 10–20 GHz are critical for increasingly important applications such as astronomical spectrograph calibration, high-speed dual-comb spectroscopy, and low-noise microwave generation. While electro-optic modulators and microresonators can provide narrowband comb sources at this repetition rate, a significant remaining challenge is a means to produce pulses with sufficient peak power to initiate nonlinear supercontinuum generation spanning hundreds of terahertz (THz) as required for self-referencing. Here, we provide a simple, robust, and universal solution to this problem using off-the-shelf polarization-maintaining amplification and nonlinear fiber components. This fiber-integrated approach for nonlinear temporal compression and supercontinuum generation is demonstrated with a resonant electro-optic frequency comb at 1550 nm. We show how to readily achieve pulses shorter than 60 fs at a repetition rate of 20 GHz. The same technique can be applied to picosecond pulses at 10 GHz to demonstrate temporal compression by 9× and achieve 50 fs pulses with a peak power of 5.5 kW. These compressed pulses enable flat supercontinuum generation spanning more than 600 nm after propagation through multi-segment dispersion-tailored anomalous-dispersion highly nonlinear fibers or tantala waveguides. The same 10 GHz source can readily achieve an octave-spanning spectrum for self-referencing in dispersion-engineered silicon nitride waveguides. This simple all-fiber approach to nonlinear spectral broadening fills a critical gap for transforming any narrowband 10–20 GHz frequency comb into a broadband spectrum for a wide range of applications that benefit from the high pulse rate and require access to the individual comb modes.
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来源期刊
APL Photonics
APL Photonics Physics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
10.30
自引率
3.60%
发文量
107
审稿时长
19 weeks
期刊介绍: APL Photonics is the new dedicated home for open access multidisciplinary research from and for the photonics community. The journal publishes fundamental and applied results that significantly advance the knowledge in photonics across physics, chemistry, biology and materials science.
期刊最新文献
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