1.3 Laser Gain Medium
In 2016, JIN L et al. used LD end-pump Tm:YAG and RTP Q-switch to make laser output with single pulse energy of 7.5 mJ and pulse width of 58 ns at repetition rate of 1 kHz.
In 2016, Zhang Zilong et al. for the first time used 880 nm end-pumped Nd:YLF laser crystal, RTP Q-switch and V-cavity structure design to miniaturize the laser. At repetition rate of 1 kHz, 1047 nm laser output with single pulse energy of 9.5 mJ and pulse width of 9.5 ns was obtained.
In 2019, Gao Qian et al. for the first time used LD partial end pumping mixed cavity Yb:YAG slab and BBO Q-switch to make 1030 nm laser output with single pulse energy of 14.6 mJ and pulse width of 30 ns at repetition rate of 2 kHz.
In 2020, WEN Y et al. used LD double-end pump Tm:YAP, RTP Q-switch and Bragg grating as cavity mirror for resonator to obtain narrow linewidth laser output. A laser output of 1937.87 nm with single pulse energy of 2.2 mJ and pulse width of 20.64 ns was obtained at repetition rate of 10 kHz.
In summary, E-O Q-switched laser achieves high repetition rate laser output. The output repetition rate of KD*P (www.wisoptic.com) Q-switch is usually lower than 1 kHz. Reducing the size of LN crystal can weaken its piezoelectric ringing effect and increase repetition rate. The application of RTP, BBO and LGS has increased the repetition rate to 100 kHz. Optical ceramic materials can produce large secondary photoelectric effect, and their potential development as E-O Q-switch should not be ignored. The occurrence of E-O deflection Q-switch (E-O deflector) increases the repetition rate to megahertz. The repetition rate of laser is not only related to the E-O Q-switched device, but also to the gain medium. Nd:YVO4 and Nd:GdVO4 with short upper level lifetime can obtain high repetition rate laser output. The excellent heat conduction performance of Nd:GdVO4 crystal makes it more suitable for operation under high refrequency E-O Q switching at high pump power. Nd:GdVO4 is a gain medium with great development prospect and application potential.
Post time: Oct-23-2022