## 3 Experiments and Indicator Testing
From a power distribution perspective, the current required to drive the microchip laser accounts for approximately 1.5 W. Additionally, the temperature control system operates at around 1-1.5 W power consumption when working at temperatures between 20-30 \({}^{\circ}\)C.  
The stability of the laser output was assessed using a laser power probe, as depicted in Figure 12. The single-pulse energy measured approximately 16.8 uJ, and the laser power stability, quantified by the QMS value, exhibited a 0.3% variation over 5 min. Although this study did not conduct extended tests on the laser's operational lifetime, calculations considering continuous operation time and pulse frequency suggest that the laser can maintain stability for up to 150,000 working pulses. The output power fluctuation remains below 0.5%, satisfying the requirements for testing in conjunction with the TOF mass spectrometer. Subsequent tests on the laser's operational lifetime will be conducted during actual operations in the future. This meticulous evaluation provides confidence in the laser's stability and performance under varying operational conditions. Figure 11: Laser output waveform plot. Figure 12: Power stability testing under single pulse output conditions. As shown in Figure 13, we verified the stability of the initial pulse. Within 30 s of starting power supply, the laser output power fluctuated slightly. This was due to the reaction time of the temperature control system. After 30 s, the laser power stabilized at 16.8 \(\upmu\)J, and the initial fluctuation amplitude was less than 2%. We utilized a CCD detector to test the output spot of the microchip laser, revealing an effective diameter of approximately 15 \(\upmu\)m and the beam quality was M\({}^{2}\) = 1.4, as shown in Figure 14. This paper employs the Thorlabs C230220P visual optical system. In future research, we will design optical pathways that are better suited for the internal structure of microchip lasers, aiming to minimize distortion and improve beam quality. Subsequently, the microchip laser was tested in conjunction with the designed optical focusing system, as shown in Figure 15. According to the approach adopted in this paper, with a designed focal length of 30 mm, white light was observed on the surface of the sample where it was excited, confirming the generation of plasma on the solid surface. In practical use, the optimal laser focus point can be determined by assessing the brightness of white light. Moreover, the half-wave plate could be adjusted to obtain laser outputs at different powers. To further confirm that the designed microchip laser can excite samples to generate plasma, we used a frequency of 500 Hz to excite the sample for 5 s, generating 2500 laser pulses with an energy of 16.8 \(\upmu\)J each. The post-excited aluminum foil sample was then observed under a microscope, as shown in Figure 16. It can be seen that there are noticeable impact craters on the foil, with a diameter of approximately 15 \(\upmu\)m, matching the size of the microchip laser's focal spot. Figure 14: The image depicting the laser spot output tested with a CCD detector. Figure 13: Initial laser pulse energy stability test.