John A. Paulson School of Engineering and Applied Sciences Harvard University
The Lončar group is committed to cultivating racial and gender diversity in photonics and the broader scientific community. If you are a student from an underrepresented background and our research appeals to you, consider applying to Harvard and joining our group! :)
We have developed a high-performance, on-chip femtosecond pulse source using a tool that seems straight out of science fiction: a time lens.
The device is highly tunable, integrated onto a 2cm by 4mm chip and, because of lithium niobate’s electro-optical properties, requires significantly reduced power than table-top products. The research is published in Nature.
Laser Focus World interviewed professor Lončar on how our lab developed on-chip electro-optic frequency combs.
“Long story short: electro-optical combs are making a comeback because they’re more efficient than other combs and can generate an appreciable amount of power,” says Lončar. “And they’re very easy to operate.”
Following the announcement of a research alliance between the AWS Center for Quantum Networking and Harvard University, a joint team of Harvard and AWS scientists published a research paper today in Science Magazine discussing production of quantum memories that can operate at higher temperatures – enabling reduced cost and increased reliability for this fundamental component of quantum communication networks.
In this work, we show the light that propagate along a frequency synthetic dimension through EO modulation, can be reflected by a frequency domain mirror, which leads to interference and trapped state in frequency domain!
We create a frequency domain crystal using EO modulation on a thin-film lithium niobate (TFLN) resonator (see our previous work on forming high-dimensional frequency crystals in a single TFLN resonator: https://doi.org/10.1364/OPTICA.395114). The frequency domain mirror is then formed by mode-...
By implementing the general critical coupling for coupled-resonators, that we developed in our previous work, to the EO comb generation, we demonstrate an EO comb with 30% conversion efficiency and 132nm comb span.
The performance of our EO comb generator features a 100-times higher...