Lasers are used in laser printers, optical disk drives, DNA sequencing instruments, fiber-optic, barcode scanners, photolithography, and free-space optical communication, laser surgery, cutting and welding materials.
Laser with the properties in the near-infrared region can be as cancer photothermal therapy.
Laser with the wavelength in order of 980-nm can act efficiently to convert 980-nm laser energy into heat and selectively destroy the target mitochondria.
I guess in quite many ways, e.g. through Raman scattering/ imaging http://www.columbia.edu/cu/chemistry/groups/min/pdf/46-annualreview.pdf
More information can be found in some newer papers in this domain (lasers in biomedical spectroscopy):
1. K Isensee, N Kröger-Lui, W Petrich, "Biomedical applications of mid-infrared quantum cascade lasers ─ a review", The Analyst, vol. 143, issue 24, pp. 5888-5911, Dec. 2018, DOI: 10.1039/C8AN01306C.
2. A. Schwaighofer, M Brandstetter, B Lendl, "Quantum cascade lasers (QCLs) in biomedical spectroscopy", Chem Soc Rev, 46(19):5903-5924, Oct 2017, DOI: 10.1039/c7cs00403f.
3. IL Jernelv, K Strøm, DR Hjelme, A Aksnes, "Infrared Spectroscopy with a Fiber-Coupled Quantum Cascade Laser for Attenuated Total Reflection Measurements Towards Biomedical Applications", Sensors (Basel), 19(23):5130, Nov. 2019, DOI: 10.3390/s19235130.
I can recommend a good review and recent publication on various methods of laser spectroscopy of stem cells and DNA.
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