{"id":445912,"date":"2020-07-24T09:52:50","date_gmt":"2020-07-24T13:52:50","guid":{"rendered":"http:\/\/www.rochester.edu\/newscenter\/?p=445912"},"modified":"2020-07-24T17:03:53","modified_gmt":"2020-07-24T21:03:53","slug":"rochester-versatile-ultrafast-laser-pulse-445912","status":"publish","type":"post","link":"https:\/\/www.rochester.edu\/newscenter\/rochester-versatile-ultrafast-laser-pulse-445912\/","title":{"rendered":"Project creates more powerful, versatile ultrafast laser pulse"},"content":{"rendered":"

<\/p>\n

Institute of Optics research sets record for shortest laser pulse for newly developed technology, work that has important applications in engineering and biomedicine.<\/div>\n


\nUniversity of Rochester<\/a> researchers are setting a new standard when it comes to producing ultrafast laser pulses over a broader range of wavelengths than traditional laser sources.<\/p>\n

In work published in Physical Review Letters<\/a><\/em>, William Renninger<\/a>, an assistant professor of optics, along with members of his lab, describe a new device, called the \u201cstretched-pulse soliton Kerr resonator,\u201d that enhances the performance of ultrafast laser pulses. The work has important implications for a range of engineering and biomedical applications, including spectroscopy, frequency synthesis, distance ranging, pulse generation, and others.<\/p>\n

The device creates an ultrafast laser pulse\u2014on the order of femtoseconds, or one quadrillionth of a second\u2014that\u2019s freed from the physical limits endemic to sources of laser light\u2014what laser scientists call laser gain\u2014and the limits of the sources\u2019 wavelengths. <\/p>\n

\u201cSimply put, this is the shortest pulse ever from a gain-free fiber source,\u201d Renninger says.<\/p>\n

\"illustration
In the stretched-pulse soliton Kerr resonator developed by the lab of William Renninger, a single frequency laser enters a fiber ring cavity, generating a broad bandwidth comb of frequencies at the output that supports ultrashort femtosecond pulses. Inside the fiber cavity the pulses stretch and compress in time, reaching a minimum duration twice in the cavity near the center of each of the two fiber sections. The stretching and compressing temporal evolution is a salient characteristic of femtosecond stretched-pulse soliton Kerr resonators. (University of Rochester \/ Illustration by Michael Osadciw\/)<\/figcaption><\/figure>\n

Renninger and his team of graduate research and postdoctoral associates improved upon Kerr resonators, an exciting new alternative for generating femtosecond laser pulses that have been the subject of considerable research. <\/p>\n

The lab overcame a challenge to pulse duration in other versions of Kerr resonators by discovering a new soliton\u2014a short burst or localized envelope of a wave\u2014that maintains its shape while propagating at a constant velocity. The solitons generated in Renninger\u2019s device differ from the solitons in other Kerr resonators, specifically in the shape and behavior of the stretching pulses they create. <\/p>\n

\u201cIt is stable in the sense it keeps repeating the same thing over and over, getting longer, then shorter, longer then shorter,\u201d Renninger says. <\/p>\n

The pulses \u201cfeature a broad spectral bandwidth and a compressed pulse duration of 210 femtoseconds, which is the shortest pulse duration observed to date from fiber Kerr resonators,\u201d the researchers state in the paper.<\/p>\n

Lead author Xue Dong is a graduate research associate in the Renninger lab. In addition to Renninger, other coauthors are Qian Yang and Christopher Spiess, also graduate research associates in the lab, and Victor Bucklew, a former postdoctoral associate in the lab.<\/p>\n

The study was funded by in part by the University\u2019s Technology Development Fund, a University Research Award, and by the National Institutes of Health.<\/p>\n

Making ultrafast lasers more accessible<\/h2>\n

Renninger, an expert in creating sources for femtosecond lasers, received his BS and PhD degrees in applied physics from Cornell University. Before joining the Institute of Optics, he was a postdoctoral associate and an associate research scientist in the Department of Applied Physics at Yale University.<\/p>\n

He recently received a National Science Foundation CAREER award<\/a>, which includes funding to create open source access to information for designing and creating advanced lasers sources generating femtosecond pulses.<\/p>\n

\u201cThere are now commercial products, but they\u2019re very expensive. They are prohibitive for many research groups with limited budgets for equipment,\u201d Renninger says.<\/p>\n

Much of the cost is for expertise, not components, so his group will use part of the CAREER funding to provide consulting for research groups at smaller universities in how to design and build femtosecond lasers for basic research.<\/p>\n

\u201cThe ultimate goal is to have a design guide published on our website for everybody,\u201d Renninger says.
\n<\/p>\n

Read more<\/strong><\/h3>\n
\n
\"imageRochester scientists receive NSF CAREER awards<\/strong><\/a>
\nUniversity of Rochester researchers were recognized by the National Science Foundation with Faculty Early Career Development (CAREER) awards.<\/span><\/div>\n
\"image
\nAn eye for seeing big problems, and solving them<\/strong><\/a>
\nUniversity of Rochester ophthalmologist Krystel Huxlin explores how ultrafast lasers can further improve surgery to correct vision.<\/span><\/div>\n
\"photo
\nRochester breakthrough in laser science earns Nobel Prize<\/strong><\/a>
\nA University of Rochester graduate and a former faculty member shared the 2018 Nobel Prize in Physics today for work they undertook at the University\u2019s Laboratory for Laser Energetics.<\/span><\/div>\n<\/div>\n

 
\n<\/p>\n","protected":false},"excerpt":{"rendered":"

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