Nav: Home

Pushing periodic disorder induced phase-matching into deep-ultraviolet spectral region

March 23, 2020

Nonlinear optical frequency conversion is an important technique to extend the wavelength of lasers which has been widely used in modern technology. The efficiency of frequency conversion depends on the phase relationship among the interacting light waves. High conversion efficiency requires the satisfaction of phase matching. However, due to the dispersion property of nonlinear optical crystals, the phase mismatching always occurs, thus, phase matching condition should be specially designed. There are two widely used techniques for phase-matching: birefringence phase matching (BPM) and quasi-phase matching (QPM). Normally, BPM employs the natural birefringence properties of nonlinear optical crystals, and QPM is mainly focused on the periodically inversion of the ferroelectric domains. However, most of nonlinear optical crystals hold neither sufficient birefringence nor controllable ferroelectric domains. Therefore, it is in urgent demand to develop new route to meet phase-matching in arbitrary nonlinear crystals and in broad wavelength ranges.

In a new paper published in Light Science & Application, scientists from the State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, China, proposed a concept based on the basic principles of nonlinear frequency transformation, additional periodic phase (APP) from the disorder alignment, which can intercept the energy transmission channel of nonlinear light to fundamental light and compensate for mismatched phase. The APP concept means that after the light propagating at the coherence length Lc, the generated phase difference Δφ_PD was compensated by the additional phase difference Δφ_APP with Δφ_APP+Δφ_PD=2mπ (m is the integer). Based on the APP concept, a periodic ordered/disordered structure is introduced into crystal quartz by femtosecond laser writing technology to achieve an effective output from ultraviolet to deep-ultraviolet at the wavelength of 177.3nm. More interestingly, the APP phase matching may get rid of the limitations of birefringent and ferroelectric materials on nonlinear frequency conversion and should be applicable to all non-centrosymmetric nonlinear crystals for achieving effective output at any wavelength in the transmission range of the materials.

"To the best of our knowledge, the phase-matched deep-ultraviolet 177.3 nm generation was firstly achieved via quartz crystal with a high efficiency of 1.07‰." they added.

"This APP strategy may provide a versatile route for arbitrary nonlinear crystal in broadband wavelength. More importantly, this order/disorder alignment adds a variable physical parameter into optical system, thus leading to next-generation revolution in nonlinear or linear modulation and classical or quantum photonics." the scientists forecast.

Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences

Related Efficiency Articles:

New 5G switch provides 50 times more energy efficiency than currently exists
As 5G hits the market, new US Army-funded research has developed a radio-frequency switch that is more than 50 times more energy efficient than what is used today.
On the trail of organic solar cells' efficiency
Scientists at TU Dresden and Hasselt University in Belgium investigated the physical causes that limit the efficiency of novel solar cells based on organic molecular materials.
Wearable health tech gets efficiency upgrade
North Carolina State University engineers have demonstrated a flexible device that harvests the heat energy from the human body to monitor health.
Photoelectrochemical water-splitting efficiency hits 4.5%
Solar-to-fuel conversion offers a promising technology to solve energy problems, yet device performance could be limited by undesired sunlight absorption.
Green hydrogen: Research to enhance efficiency
Laboratory experiments and a parabolic flight campaign have enabled an international team of researchers from the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) to gain new insights into water electrolysis, in which hydrogen is obtained from water by applying electric energy.
New efficiency world record for organic solar modules
Researchers from Nuremberg and Erlangen has set a new record for the power conversion efficiency of organic photovoltaic modules.
A new method for quantifying crystal semiconductor efficiency
Japanese scientists have found a new way to successfully detect the efficiency of crystal semiconductors.
Improving efficiency, brightness of perovskite LEDs
Advances in organic phosphorescent materials are opening new opportunities for organic light-emitting diodes for combined electronics and light applications, including solar cells, photodiodes, optical fibers and lasers.
'Deforming' solar cells could be clue to improved efficiency
Solar cells and light sensing technologies could be made more efficient by taking advantage of an unusual property due to deformations and defects in their structures.
Pioneering 3D printed device sets new record for efficiency
A new 3-D printed thermoelectric device, which converts heat into electric power with an efficiency factor over 50% higher than the previous best for printed materials -- and is cheap to produce in bulk -- has been manufactured by researchers at Swansea University's SPECIFIC Innovation and Knowledge Centre.
More Efficiency News and Efficiency Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Listen Again: Meditations on Loneliness
Original broadcast date: April 24, 2020. We're a social species now living in isolation. But loneliness was a problem well before this era of social distancing. This hour, TED speakers explore how we can live and make peace with loneliness. Guests on the show include author and illustrator Jonny Sun, psychologist Susan Pinker, architect Grace Kim, and writer Suleika Jaouad.
Now Playing: Science for the People

#565 The Great Wide Indoors
We're all spending a bit more time indoors this summer than we probably figured. But did you ever stop to think about why the places we live and work as designed the way they are? And how they could be designed better? We're talking with Emily Anthes about her new book "The Great Indoors: The Surprising Science of how Buildings Shape our Behavior, Health and Happiness".
Now Playing: Radiolab

The Third. A TED Talk.
Jad gives a TED talk about his life as a journalist and how Radiolab has evolved over the years. Here's how TED described it:How do you end a story? Host of Radiolab Jad Abumrad tells how his search for an answer led him home to the mountains of Tennessee, where he met an unexpected teacher: Dolly Parton.Jad Nicholas Abumrad is a Lebanese-American radio host, composer and producer. He is the founder of the syndicated public radio program Radiolab, which is broadcast on over 600 radio stations nationwide and is downloaded more than 120 million times a year as a podcast. He also created More Perfect, a podcast that tells the stories behind the Supreme Court's most famous decisions. And most recently, Dolly Parton's America, a nine-episode podcast exploring the life and times of the iconic country music star. Abumrad has received three Peabody Awards and was named a MacArthur Fellow in 2011.