Fig. 1. Polarized emission spectra of Tm∶YLF crystal with Tm atomic fraction of 3% and polarized absorption spectra of Ho∶YVO₄ crystal with Ho atomic fraction of 0.6%

Fig. 2. Experimental setup of Tm∶YLF laser intra-cavity pumped Ho∶YVO₄ laser

Fig. 3. Output power of c-cut Tm∶YLF laser with output spectrum at maximum laser power shown in inset

Fig. 4. Experimental results. (a) Output powers of the intra-cavity pumped Ho∶YVO₄ laser and laser wavelengths measured at different pump powers; (b) output spectra measured at laser threshold power and highest output power

Fig. 5. Measured beam quality of intra-cavity pumped Ho∶YVO₄ laser at maximum output power with 2D and 3D far-field spot profiles shown in inset