A breakthrough in laser technology has been achieved by miniaturizing ultrafast mode-lock lasers onto nanophotonic chips, using thin-film lithium niobate. This advancement paves the way for compact, efficient lasers with wide applications in imaging, sensing, and portable technology.
The new advance will enable pocket-sized devices that can perform detailed Lasers are essential tools for observing, detecting, and measuring things in the natural world that we can’t see with the naked eye. However, the ability to perform these tasks is often restricted by the need to use expensive and large instruments.
Innovations in Ultrafast Laser Technology
In a newly published cover-story paper in the journal Science, researcher Qiushi Guo demonstrates a novel approach for creating high-performance ultrafast lasers on nanophotonic chips. His work centers on miniaturizing mode-lock lasers — a unique laser that emits a train of ultrashort, coherent light pulses in femtosecond intervals, which is an astonishing quadrillionth of a second.
Chip scale, ultrafast mode-locked laser based on nanophotonic lithium niobate. Credit: Alireza Marandi
Unlocking Nature’s Fastest Timescales
Ultrafast mode-locked lasers are indispensable to unlocking the secrets of the fastest timescales in nature, such as the making or breaking of molecular bonds during chemical reactions, or light propagation in a turbulent medium. The high speed, pulse-peak intensity, and broad-spectrum coverage of mode-locked lasers have also enabled numerous photonics technologies, including optical atomic clocks, biological imaging, and computers that use light to calculate and process data.
Unfortunately, state-of-the-art mode-locked lasers are currently expensive, power-demanding tabletop systems that are limited to laboratory use.
Towards Smaller, Efficient Photonics
“Our goal is to revolutionize the field of ultrafast photonics by transforming large lab-based systems into chip-sized ones that can be mass-produced and field deployed,” said Guo, a faculty member with the CUNY Advance Science Research Center’s Photonics Initiative and a physics professor at the CUNY Graduate Center.
“Not only do we want to make things smaller, but we also want to ensure that these ultrafast chip-sized lasers deliver satisfactory performances. For example, we need enough pulse-peak intensity, preferably over 1 Watt, to create meaningful chip-scale systems.”
The Challenge of Miniaturization
Realizing an effective mode-locked laser on a chip is not a straightforward process, however. Guo’s research leverages an emerging material platform known as thin-film lithium niobate (TFLN). This material enables very efficient shaping and precise control of laser pulses by applying an external radio frequency electrical signal.
In their experiments, Guo’s team uniquely combined the high laser gain of III-V
For more on this breakthrough:
- Ultrafast Laser Technology Miniaturized on Tiny Photonic Chips
Reference: “Ultrafast mode-locked laser in nanophotonic lithium niobate” by Qiushi Guo, Benjamin K. Gutierrez, Ryoto Sekine, Robert M. Gray, James A. Williams, Luis Ledezma, Luis Costa, Arkadev Roy, Selina Zhou, Mingchen Liu and Alireza Marandi, 9 November 2023, Science.DOI: 10.1126/science.adj5438
Source: SciTechDaily