## 3 Experiments and Indicator Testing  
The laser and its associated electronics were assembled into a compact physical unit, as depicted in Figure 9. Following assembly, the laser weighs merely 46 g, occupying dimensions of 48 \(\times\) 22 \(\times\) 22 mm\({}^{3}\), while the driving control electronics section weighs 60 g, with dimensions measuring 62 \(\times\) 42 \(\times\) 22 mm\({}^{3}\). Power supply and control can be conveniently established by connecting through a miniature aviation connector. The paper experimented and tested the relevant parameters of the laser. It should be noted that the currently assembled laser is a prototype for functional verification. In actual space science experiments, targeted adjustments may be necessary based on specific usage environments, and the parameters may vary accordingly. Figure 8: Structure diagram of temperature control system. Figure 9: Photograph of microchip laser. Figure 10 illustrates the output waveform of the developed microchip laser driver electronics. Sending commands from the upper computer to the control system, set the parameters of the output current to a frequency of 500 Hz, a pulse duration of 150 us, and an amplitude of 5 A. Post-processing by the MCU results in the generation of a reference signal, and the current waveform is observed to be stable with rise and fall times less than 10 us, displaying no significant overshoot or undershoot. At this juncture, convenient adjustments to the pump source's current frequency, for increasing or decreasing the microchip laser's repetition rate, can be executed through commands dispatched from the upper computer. Furthermore, parameters such as amplitude and pulse duration of the output current, along with the system's operating temperature, can be easily modified as required. Assessing the temperature control system's performance entailed configuring various temperature gradients. The experiment is conducted at room temperature, approximately 23 \({}^{\circ}\)C. Following a 5-s delay, an infrared thermometer was employed to gauge the temperature of the laser's operating panel. The results, detailed in Table 2, demonstrate that the working environment promptly responds to temperature control signals, ensuring a consistently stable operating temperature. This validation underscores the reliability and effectiveness of the temperature control system in maintaining the desired thermal conditions during the operation of the microchip laser. Collaborating with the laser, we fine-tuned the optimal working conditions. Setting the operating temperature at 25 \({}^{\circ}\)C and the operating current at 5 A, the tested laser output is illustrated in Figure 11. At this juncture, the laser pulse duration measured 410 ps, and each input electrical pulse precisely corresponded to an actual output laser pulse without any stray pulses. This observation affirms that the temperature and current settings were \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Set Temperature (\({}^{\circ}\)C)** & **Actual Measured Temperature (\({}^{\circ}\)C)** & **Deviation Value (\({}^{\circ}\)C)** & **Overall Power Consumption (W)** \\ \hline
15 & 15.1 & +0.1 & 3.3 \\
18 & 18.2 & +0.2 & 3.1 \\
21 & 20.9 & \(-\)0.1 & 2.8 \\
24 & 24.0 & 0 & 2.7 \\
27 & 27.1 & +0.1 & 2.9 \\
30 & 29.8 & \(-\)0.2 & 3.0 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Operation test of the temperature control system. Figure 10: Experimentally measured current waveform plot. appropriate, ensuring the laser crystal operated under suitable conditions. The overall power consumption of the system at this point was less than 3 W. It is important to note that the overall power consumption of the system is dependent on the operating environment of the microchip laser.