Fatih Bulut There seems to be a lot of fluorescence in your photograph. Try experimenting with different laser wavelengths, such as 785 nm or 1064 nm, to see if you can reduce fluorescence interference.

This compound Lithium iron phosphate (LiFePO4) can be challenging due to its low Raman scattering cross-section and possible fluorescence interference. Try increasing the integration time, optimizing laser focus, and exploring different excitation wavelengths (e.g., 633 nm) to suppress fluorescence.

Here are a few more resources.

Raman facility | NIST

Handbook of Raman Spectroscopy: From... by Lewis, Ian R. (amazon.com)

I hope you find this useful. Warm regards

Congratulations Fatih Bulut. It always takes work to build a working setup.

It mentioned that laser 532 nm with 40 mW power is sufficient to obtain Raman spectra in most cases.

A quick look into Lithium iron phosphate (LiFePO4) Raman spectra shows that the spectra are somewhat featureless for as-synthesized (not annealed or treated).

You may try two things: