• Medicine
  • Spirituality
  • Astronomy
  • Sociology
  • Technology
  • History
  • Open Access
  • News

Researchers Use Infrared Light Technology To Transmit Power Up To 100 Feet Wirelessly

To provide a risk-free alternative to corded charging for mobile devices and power the Internet of Things (IoT) devices spread throughout an area, researchers at Sejong University in South Korea have developed a new laser charging system that can transmit power using infrared light technology for up to 30 meters (98.4 feet).

This is far enough away for the system to make 400 mW of power, which is enough to charge sensors but insufficient to charge mobile devices. Wireless power transfer over long distances is possible, but keeping the electricity safe at distances on the order of meters has been challenging.

The researchers devised a distributed laser charging method to get around this problem. This entails physically isolating the laser's transmitter and receiver to form a laser cavity, which is then used to transport power via light.

When an obstacle is in the way of the power source, the system will switch to a failsafe mode that will still send energy without the risk of damage.

Distributed Laser Charging

Although many approaches have been explored for wirelessly transferring electricity over great distances, securely sending sufficient power has proven challenging thus far.

Because of this, the scientists devised an innovative technique they termed "distributed laser charging." This method provides safe, high-power lighting with less light loss.

Distributed laser charging functions similarly to conventional lasers. However, unlike conventional lasers, the optical transmitter and receiver are not merged into a single device to form the laser cavity.

When a transmitter and receiver are in the line of sight, a laser cavity is formed between them. This paves the way for the system to provide energy from light sources.

When something gets in the way of the line of sight between the transmitter and receiver, the system automatically goes into a power-safe mode to keep sending power without the risk.

The optical power source utilized to create the new system had a 1550 nm central wavelength and was based on an erbium-doped fiber amplifier. This wavelength is far beyond the danger zone for human eyes and skin at the applied strength.

One of the researchers stated that distributed laser charging permits self-alignment without tracking procedures as long as the transmitter and receiver are in a direct line of sight.

At the same time, most other systems need the receiving device to be in a particular charging cradle or stationary. If anything or someone interrupts its line of sight, it automatically changes to a safe, low-power delivery mode.

Laboratory Test

To test the system, scientists separated a transmitter and a receiver by 30 meters (98 ft). The optical amplifier fiber was doped with erbium to create the transmitter.

While a retroreflector, a photovoltaic cell to convert the optical signal to electrical power, and a light-emitting diode (LED) to indicate, power delivery made up the reception unit. This small receiver, about 10 millimeters by 10 millimeters, could be easily put into gadgets and sensors.

The optical power of 400 mW with a channel linewidth of 1 nm was demonstrated across a distance of 30 meters using a single-channel wireless optical power transfer system in an experimental setup. The solar panel transformed this into 85 mW of electricity.

The study's authors also demonstrated that the system immediately switched to a safe power transfer mode when a human hand blocked the device's line of sight. Light output from the transmitter was so weak in this setting that it posed no threat to human eyes.


After successfully demonstrating the technology, the researchers are now focusing on making it more useful in real-world settings. For instance, a solar cell's ability to convert light into electricity might be improved.

One of their goals is to figure out how to utilize the mechanism to charge several receivers simultaneously.

Recent Articles

  • Stone Age Humans Conducted Surgical Amputation, A New Study Finds Evidence

    Stone Age Humans Conducted Surgical Amputation, A New Study Finds Evidence

    Scientific investigation in Borneo has unearthed the world's first documented instance that stone age humans conducted surgical amputation. This discovery represents a significant achievement in the annals of human prehistory.

  • 180 Tips - Best Website For Football Prediction And Tips

    180 Tips - Best Website For Football Prediction And Tips

    How can you beat the best odds at the most well-known online bookmakers when betting on soccer matches? Today's 180 Tips forecasts from Betwinner360 include a record of winning methods. 180 tips provides in-depth research of more than 50 different football leagues, betting tactics organized by market, and expert predictions for each match.

  • Virgo And Sagittarius Compatibility - Great Conversations

    Virgo And Sagittarius Compatibility - Great Conversations

    Virgo and Sagittarius's compatibility is such that they are attracted to one another right away. They base their first interactions on how well they get along in conversation, which comes naturally to them both. These changeable signs will enjoy every minute of talking to each other to death! They engage in frenzied arguments, lengthy philosophical discussions, and fast banter.

  • Pisces And Aquarius Compatibility - Creative Brilliance

    Pisces And Aquarius Compatibility - Creative Brilliance

    Pisces and Aquarius compatibility is such that these two are masters of manifestation while working together. When Aquarians let go of their rigid views, they become natural alchemists who are capable of creating with their creative brilliance. Because of their more flexible and understanding nature, Pisces may assist them in becoming less stuck and releasing their boundless creative potential.

  • Pisces And Scorpio Compatibility - Best Match For Love

    Pisces And Scorpio Compatibility - Best Match For Love

    Pisces and Scorpio compatibility is that they have an innate knowledge of one another, even though they are frequently mysterious to others. These two are irresistibly attracted to each other because they feel like they understand each other but don't say it out loud. They seem to have a psychic connection because they can easily tune into one another's brains.

  • A Massive 7.6 Earthquake Rocks Papua New Guinea

    A Massive 7.6 Earthquake Rocks Papua New Guinea

    On Sunday, a massive 7.6 earthquake rocks Papua New Guinea, causing landslides, cracking roads, and damaging houses. It is currently unknown how extensive the damage is; however, there is debris scattered over the highways and fissures popping up in the roads. According to the United States Geological Survey, the epicenter of the earthquake was located at a depth of 90 kilometers, or around 56 miles, and was close to the town of Kainantu, which has a population of approximately 8,500 people.

  • Most Frequent Angel Numbers You Keep Seeing Is Luck Or Unlucky

    Most Frequent Angel Numbers You Keep Seeing Is Luck Or Unlucky

    The most frequent angel numbers you keep seeing are distinct from other forms of esoterica in that they have no connection to the date that you were born. In numerology, every number has a meaning. Nevertheless, certain number sequences are more prevalent than others. Because all of us have come across them, three-digit angel numbers are widespread.

  • Pisces And Leo Compatibility Is Quite Strong

    Pisces And Leo Compatibility Is Quite Strong

    Leo will inevitably rule Pisces in some aspect of life, Pisces and Leo compatibility whether it is in terms of work, friendship, or love. However, as Leos are kind and loving rulers who have no malice in their hearts, and since the fish don't mind being ruled if it's done with warmth and love, this isn't always a terrible thing.

  • Angel Number 6666 Meaning - A Sign That Your Heart Is Full Of Love

    Angel Number 6666 Meaning - A Sign That Your Heart Is Full Of Love

    If you keep seeing the same number in your life, it's not a coincidence. The angels use Angel Number 6666 meaning to send you an important message. If you can clearly interpret the message of angel number 6666, it will serve you well. This number appears in your life directly from the divine realm.