Brewing coffee with a laser. Free Technical Library News

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Brewing coffee with a laser

27.09.2022

German scientists came up with a laser for making coffee. The device not only prepares a drink 300 times faster, but also reveals its taste and aroma properties better.

One of the popular ways of brewing coffee - cold-brew - involves cold extraction of the drink. Ground coffee beans are poured with water and left to infuse. It takes about 24 hours to brew a cold drink, but modern equipment reduces the time to 12 hours. There is a way to speed up the process.

The method is based on laser synthesis and processing of colloids (LSPC). It is usually used to create solutions of suspended nanoparticles. The researchers took a neodymium-doped yttrium aluminum garnet (Nd:YAG) laser tuned to 532 nanometers and created 125 picojoule pulses that lasted just 10 picoseconds. After that, the laser passed through the coffee solution. They passed it through a solution of ground coffee mixed with water about 80 times per second for three minutes, never raising the temperature by more than a few degrees.

Laser coffee was compared to a cold-brew drink that was brewed for 24 hours and a hot cup of coffee brewed using a drip filter. The acidity in the laser coffee was almost identical to the level of the drink brewed for 24 hours, and significantly less than in hot coffee. The most fragrant coffee - traditional cold brew, and prepared with a laser - in second place.

In addition, no foreign substances were found in laser coffee.

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