High-power narrow-linewidth nanosecond Ti:sapphire laser with volume Bragg grating

We report the development of a high-power, nanosecond gain-switched Ti:sapphire laser with a narrow spectral linewidth, achieved by a simple plano-plano cavity design and a volume Bragg grating (VBG) as the cavity end mirror. Pumped by a frequency-doubled Nd:YLF laser, the laser produced a maximum average power of 8.8 W at 775 nm, with a spectral linewidth of approximately 0.1 nm, a pulse width of 30 ns for the repetition rate of 10 kHz. In addition, sub-pulse generation was suppressed by extending the cavity length. This work highlights the performance improvements achieved by spectral control and sub-pulse suppression, providing a reliable platform for applications in spectroscopy, microscopy, and ultraviolet generation.