Fig. 8

Spectra of the OPDW at 898 and 904 nm. (a)–(c) show the change of spectral intensity ratio between the two laser wavelengths by adjusting the working temperature of LD. (a) λ_p = 794.95 nm at 24 °C, (b) λ_p = 796.85 nm at 32.6 °C, (c) λ_p = 798.20 nm at 38 °C.