| Summary: | A high-transmittance ultra-thin titanium dioxide (TiO2) film saturable absorber (SA) fabricated by Langmuir-Blodgett (LB) technology is reported and used for the first time to obtain passively Q-switched pulses from a solid-state laser. The optical loss of pure TiO<sub>2</sub> LB film at a wavelength of 1 μm is only 6.5%, and the nonlinear modulation depth, saturation intensity, and non-saturable loss of the entire TiO<sub>2</sub> SA device are 4.3%, 0.125 MW/cm<sup>2</sup>, and 9.8%, respectively. Intrinsic high stability and heat resistance of TiO<sub>2</sub> nanomaterials contribute to a laser output with average power (2.35 W) and a corresponding laser pulse width and repetition rate of 173 ns and 2.008 MHz, respectively. The laser output with the pulse energy of 1.17 μJ and peak power of 6.76 W indicates the excellent potential of TiO<sub>2</sub> nanomaterials for applications in solid-state pulsed lasers.
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