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利用X型四境腔中第二稳区振荡光斑大小随臂长变化关系,设计了一种快速半导体可饱和吸收镜启动的高功率皮秒模掺钛蓝宝石激光器。通过改变臂长改变SESAM表面光斑大小,进而改变SESAM表面功率密度实现锁模,采用恒温循环通水紫铜作为SESAM热沉,有效消除了高功率运转下热噪声导致的锁模不稳定。在10W泵浦功率下,利用腔内自相位调制和群速度色散相互制约机制,获得了稳定类孤子锁模脉冲,输出典型的脉冲宽度为20ps,中心波长为813nm,对应的重复频率为100MHz。在输出镜透过率为10%和20%时,输出最大功率分别为1.80W和1.95W。结果表明:这种设计对应SESAM表面较大光斑,在同样的锁模功率密度下,支持更高的腔内功率密度,适合高功率高光束质量锁模运转,最终获得近2W的稳定锁模皮秒脉冲输出。
A high power picosecond-mode Ti: sapphire laser activated by a fast semiconducting saturable absorber was designed by using the relationship between the oscillation spot size and the arm length of the second stable region in the X-shaped four-cavity. By changing the arm length and changing the surface spot size of SESAM surface, the power density of SESAM surface can be changed to realize the mode locking. The constant temperature circulating water copper is used as the SESAM heat sink, which effectively eliminates the unstable mode locking caused by thermal noise under high power operation. Under 10W pump power, a stable soliton-like mode-locked pulse was obtained by using the inter-cavity self-phase modulation and the group velocity dispersion constraint. The typical output pulse width was 20ps, the center wavelength was 813nm and the corresponding repetition frequency was 100MHz. In the output mirror transmittance of 10% and 20%, the maximum output power of 1.80W and 1.95W respectively. The results show that this design corresponds to a large spot on the surface of SESAM and supports a higher intracavity power density under the same mode-locked power density, which is suitable for high-power and high-beam quality mode locking operation. Finally, a stable mode-locked skin Second pulse output.