Continuous-wave diamond laser with a tunable wavelength in orange–red wavelength band

Orange–red lasers (∼590–625 nm) are of tremendous interest in biomedicine, astronomy, spectroscopy, and laser scanning. So far, the implementation of tunable is still based on the mode-selecting elements in the laser, but it is difficult to achieve a wide range of tuning due to the limited ability to select the optical elements. Here, we report a continuously tunable diamond Raman laser with output from 592–624 nm based on an all-fiber tunable ytterbium-doped laser. A maximum output power of 4.5W is obtained at 40W of pump power with a maximum slope efficiency of 17%. Also, we found the anti-Stokes spectrum in the output spectrum. To the best of our knowledge, this is the first discovery in a continuous-wave diamond Raman laser. The work demonstrated that continuously tunable multispectral outputs can be achieved with the same technique.