将石墨烯作为宽带可饱和吸收体分别应用在1.06 μm Nd∶YAG固体激光器、2μm Tm∶YAP固体激光器以及1.55 μm掺铒全光纤激光中.石墨烯采用化学汽相沉积法制备, 以乙炔作为碳源, 25 μm厚的铜箔作为生长基体和催化剂, H2为载气, Ar为辅助气体, 在常压、1 000 ℃高温条件下进行生长.1.06 μm Nd∶YAG固体激光器实验中, 采用直线型侧面泵浦腔型结构, 当输出功率为10 W时, 得到了重复频率为360 kHz, 脉冲宽度240 ns的最短脉冲输出, 其单脉冲能量为27 μJ, 峰值功率为115.7 W; 2 μm Tm∶YAP固体激光器实验中, 使用中心波长在795 nm附近的半导体激光器作为泵浦源, 采用10%透过率的输出镜获得了脉宽为1.4 μs的最窄调Q脉冲; 环形腔1.55 μm掺铒全光纤激光器实验中, 利用1.25 m长的高掺铒光纤作为增益光纤, 当泵浦功率为100 mW时, 输出功率为10 mW, 获得了脉冲宽度314 ps的稳定被动连续锁模脉冲, 脉冲重复频率为20 MHz并验证了同次制备的石墨烯的宽带可饱和吸收特性.

Graphene was used for broadband saturable absorber and simultaneously applied in 1.06 μm Nd∶YAG laser, 2 μm Tm∶YAP laser and 1.55 μm Erbium-doped fiber laser. Taking advantage of the Atmospheric-pressure chemical vapor deposition method, acetylene and 25 μm thickness copper foil were applied as the carbon source and the catalyst respectively. Keeping them growing at the atmosphere of 1 000 ℃ and ordinary atmospheric pressure. In the experiment of 1.06 μm Nd∶YAG solid state laser, the repetition frequency is 360 kHz when the output power is 10 W. The shortest pulse duration is 240 ns and the single pulse energy is about 27 μJ, corresponding peak power is 115.7 W. In the experiment of 2 μm Tm∶YAP solid state laser, a LD centered at 795 nm wavelength is employed for pump source. The pulse light is output via an end mirror with 10% transmittance, which generate the shortest Q-switching pulse with 1.4 μs pulse width. In the experiment of 1.55 μm erbium-doped ring cavity all fiber laser, a 1.25 m Erbium(Er3+) doped fiber is used for gain medium. The average mode-locking laser output power is 10 mW when pump power reach 100 mW. The output pulse duration and repetition frequency are about 314 ps and 20 MHz respectively. Therefore, the broadband saturable absorption of graphene was demonstrated, and stable short pulse laser was obtained in a series of experiments.