Abstract
We report a cavity-dumped 1123 nm laser with narrow pulse width and high peak power by an MgO: LN crystal electro-optic (EO) modulator. Based on the structural optimization design of a folded biconcave cavity using the 808 nm pulsed laser diode (LD) side-pumped ceramic Nd: YAG rod, output pulses with maximum pulse energy and peak power up to 39.6 mJ and 9.73 MW were obtained, corresponding to 100 Hz repetition rate and 4.07 ns pulse width. The instabilities of pulse width and pulse energy were $\pm$1.55% and $\pm$2.06%, respectively. At the highest repetition rate of 1 kHz, the pulse energy, pulse width, and peak power were 11.3 mJ, 5.05 ns, and 2.24 MW, respectively. The instabilities of pulse width and pulse energy were $\pm$2.65% and $\pm$3.47%, respectively.
Highlights
In recent years, pulsed Nd: YAG lasers with high energy, narrow pulse width, high peak power and good stability have been widely used in laser radar, precision machining, optical communications, ranging, medicine, nonlinear optical frequency conversion, and so on[1,2,3,4,5]
The changes of the single-pulse energy and the pulse width of the EO cavity-dumped 1123 nm laser with the pump current and pump voltage are shown in Figure 3 at different pulse repetition rates
It is demonstrated that the reduction of the pulse repetition rate leads to an increase of the one way laser gain under the same pump current, so that the single-pulse energy of the cavity-dumped lasers increases
Summary
In recent years, pulsed Nd: YAG lasers with high energy, narrow pulse width, high peak power and good stability have been widely used in laser radar, precision machining, optical communications, ranging, medicine, nonlinear optical frequency conversion, and so on[1,2,3,4,5]. In 2016, Li et al obtained a passively Q-switched 1123 nm laser with a repetition rate of 116 kHz, pulse width of 8 ns, and singlepulse energy of 69 μJ by using 808 nm laser diode (LD) end-pumped ceramic Nd: YAG and Cr4+: YAG saturable absorber[18]. In 2017, Sung et al obtained a self-mode-locked Nd:YAG laser at 1123 nm with a repetition rate of 4.5 GHz, pulse width of 50.8 ps, and single-pulse energy of 0.53 nJ by using 808 nm LD end-pumped Nd: YAG crystal[20]. Output pulses with repetition rates varying from 100 Hz to 1 kHz, pulse width shorter than 5 ns and peak power from 2 MW to 10 MW were obtained by utilizing 808 nm pulsed LD side-pumped ceramic Nd: YAG rod and electro-optical (EO) cavity dumping
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