In order to stabilize the wavelength a nd compress the spectral bandwidth of high power semiconductor lasers,the extern al cavity semiconductor lasers are usually constructed by using a reflective vol ume Bragg grating (VBG) as the reflecting mirror.VBG is a periodically modulated refractive index structure made in one direction of a special photosensitive gl ass by using laser holography technology.A novel photo-thermo-refractive (PTR) glass was designed and prepared by the traditional melt-quenching method.Glass transition temperature and the softening temperature of the PTR glass were dete rmined.A high transmittance up to 91% was achieved above the wavelength of 400nm.NaF nanocrystals were successfully precipitated from the PTR glass by the hol ographic exposure under UV radiation and two-step thermal treatment process.A r eflective VBG at 975.80nm was recorded in the PTR glass and was used for the wa velength locking of a high power semiconductor laser diode (LD).The output wavel ength could be precisely locked at 975.80nm using a reflective VBG with the dif fraction efficiency of 13.97%.The output line-width was effectively compressed below 0.4nm.Only 0.06nm red shift was realized for different input currents (2A→10A) with the same water cooling temperature.The maximum output power is 9. 7W for the single tube LD with a power of 10.2W.