Please suggest me a chemical liquid that has very good optical absorbance for the laser of wavelength 1000 nm.

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Roberto Caputo

Hello,

you could use very large metal nanoparticles (gold nanorods) or cholesteric liquid crystals in Grand jean configuration having an optical bandgap in the region of your interest.

I hope it helps

Michail N. Taran

Water has a broad intense absorption band near 1000 nm. The second evertone of the O-H vibration.

Aleksandr A. Tarasov

Black ink

Nithin Shekar

Thank you all for your suggestions