Photonics is like using tiny, invisible wizards called photons to do lots of exciting things. These photons are like little packets of energy that can move really fast and work together to create light, like a big swarm of fireflies. And just like how each firefly can make different colors of light, photons can also create many different kinds of light that we can't even see with our eyes!
Now, a spectra is like the magic spell that helps us see what colors of light these photons are making. It's like a rainbow that shows us all the different colors in the light that we can't see. And there are special tools called spectrometers that can help us measure these spectra and figure out what kinds of photons are creating the light we see.
So when we talk about photonics spectra, we're really just talking about using photons to make light that we can measure and study with special tools. It's a bit like being a wizard yourself, using magic to make beautiful colors and patterns that can help us learn more about the world around us!