Supercontinuum Lasers as Versatile Tool in the Photobiomodulation Field

Photobiomodulation (PBM) is a therapeutic technique that uses specific wavelengths of light to modulate biological processes in cells and tissues. This technique is often used to promote healing, reduce inflammation, alleviate pain, and stimulate various cellular functions. In the following text, we are going to explore this technique and the advantages of using the FYLA Supercontinuum Laser as a light source for PBM. 

The Role of Wavelengths in Photobiomodulation: Understanding Cellular Mechanisms and Biological Effects

Photobiomodulation involves the absorption of light by chromophores (light-sensitive molecules) within cells. These chromophores are usually components of the cell’s mitochondria, such as cytochrome c oxidase, which is a key enzyme in the electron transport chain. When these chromophores absorb light, they become activated, leading to an increase in mitochondrial activity. This results in enhanced production of adenosine triphosphate (ATP), the primary energy currency of the cell. 

PBM can also lead to a controlled increase in reactive oxygen species (ROS). While high levels of ROS can be damaging, controlled levels can act as signaling molecules that promote cell repair and regeneration. 

The combination of an increase in ATP and ROS can activate various signaling pathways and transcription factors, leading to changes in gene expression. This can result in the production of proteins that are involved in cellular repair, growth, and anti-inflammatory responses. 

Wavelengths play a critical role in photobiomodulation (PBM) because the biological effects of PBM are highly dependent on the specific wavelengths of light used. Different chromophores absorb light at specific wavelengths. For instance, cytochrome c oxidase absorbs light most efficiently in the red (600-700 nm) and near-infrared (700-1100 nm) regions. 

Comparative Analysis of Wavelength Effects on Escherichia coli Growth Using a Supercontinuum Pulsed Laser

A good example of the differences between wavelength effects is the publication “Report on the observation of photobiomodulation in Escherichia coli with a supercontinuum pulsed laser”. In this publication, the authors make a comparative analysis of the effects produced by irradiating Escherichia coli samples with four different wavelengths (570, 622, 633, and 733 nm) using the FYLA Supercontinuum laser as a light source. These wavelengths were chosen to explore their specific effects on E. coli growth. 

The development of the experiment is quite simple, five categories of samples of Escherichia coli were prepared. Four of them were irradiated with one of the wavelengths previously mentioned and the last one remains as a control sample. The growth of E. coli was monitored by measuring the optical density (OD) at 600 nm every hour for five hours. This allowed the researchers to construct growth curves and compare the effects of different wavelengths on bacterial proliferation. The results are shown in the image below:

As you can see, the effects of irradiation are clear compared to the control sample and reach the maximum effect at 570nm but to get to this result the investigator must try different wavelengths, and this is a complicated process if you do not have the correct tool. 

The Supercontinuum Laser: A Versatile and Cost-Effective Light Source for Multi-Wavelength Photobiomodulation Experiment

In an experiment where there are a relatively large number of different wavelengths, a light source for each of them could be not only expensive but also impractical in terms of space and maintenance. In these cases, the Supercontinuum Laser could be the best answer. 

The Supercontinuum Laser provides a wide range of wavelengths, allowing for the selection of optimal wavelengths for specific experimental needs. This flexibility is beneficial for targeting specific absorption peaks of chromophores like cytochromes in biological samples. This characteristic eliminates the need to have one light source for every wavelength and increases the adaptability of the setup to other types of samples that require different wavelengths without the need to change the laser. 

The possibility of choosing the bandwidth is the other big advantage of the Supercontinuum Laser. With this feature, the investigators can excite more than one wavelength at the same time allowing them to examine the combined effects they have in the sample. 

Finally, all of this wouldn’t be possible without the high brightness of this laser. The availability of light intensity across the spectrum is an important characteristic in many applications. In this case, it allowed the investigators to choose different wavelengths knowing they would have enough power to cause an effect in the sample. 

This combination of characteristics makes the Supercontinuum Laser a great alternative light source for photobiomodulation allowing researchers to work with different types of samples and wavelengths without the need to change to different lasers, making the Supercontinuum Laser a great cost-effective option for their setup.