Report
Femtosecond Pulse Generation via an Integrated Electro-Optic Time Lens
| العنوان: | Femtosecond Pulse Generation via an Integrated Electro-Optic Time Lens |
|---|---|
| المؤلفون: | Yu, Mengjie, Reimer, Christian, Barton, David, Kharel, Prashanta, Cheng, Rebecca, He, Lingyan, Shao, Linbo, Zhu, Di, Hu, Yaowen, Grant, Hannah R., Johansson, Leif, Okawachi, Yoshitomo, Gaeta, Alexander L., Zhang, Mian, Lončar, Marko |
| سنة النشر: | 2021 |
| المجموعة: | Physics (Other) |
| مصطلحات موضوعية: | Physics - Optics, Physics - Applied Physics |
| الوصف: | Integrated femtosecond pulse and frequency comb sources are critical components for a wide range of applications. The leading approaches for on-chip pulse generation rely on mode locking inside microresonator with either third-order nonlinearity or with semiconductor gain. These approaches, however, are limited in noise performance, wavelength tunability and repetition rates. Alternatively, sub-picosecond pulses can be synthesized without mode-locking, by modulating a continuous-wave (CW) single-frequency laser using a cascade of electro-optic (EO) modulators. This method is particularly attractive due to its simplicity, robustness, and frequency-agility but has been realized only on a tabletop using multiple discrete EO modulators and requiring optical amplifiers (to overcome large insertion losses), microwave amplifiers, and phase shifters. Here we demonstrate a chip-scale femtosecond pulse source implemented on an integrated lithium niobate (LN) photonic platform18, using cascaded low-loss electro-optic amplitude and phase modulators and chirped Bragg grating, forming a time-lens system. The device is driven by a CW distributed feedback (DFB) chip laser and controlled by a single CW microwave source without the need for any stabilization or locking. We measure femtosecond pulse trains (520 fs duration) with a 30-GHz repetition rate, flat-top optical spectra with a 10-dB optical bandwidth of 12.6 nm, individual comb-line powers above 0.1 milliwatt, and pulse energies of 0.54 picojoule. Our results represent a tunable, robust and low-cost integrated pulsed light source with CW-to-pulse conversion efficiencies an order of magnitude higher than achieved with previous integrated sources. Our pulse generator can find applications from ultrafast optical measurement to networks of distributed quantum computers. |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2112.09204 |
| رقم الانضمام: | edsarx.2112.09204 |
| قاعدة البيانات: | arXiv |
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