普遍方法：

\resizebox{\textwidth}{!}{
\begin{tabular}{llccccccc}
    ...
\end{tabular}
}

# or
\setlength{\tabcolsep}{!}{
\begin{tabular}{llccccccc}
    ...
\end{tabular}
}

# or
\scalebox{0.6}{
\begin{tabular}{llccccccc}
    ...
\end{tabular}
}

若没有效果

则考虑调整字体大小

\small

\tiny

\footnotesize

参考链接：Font sizes, families, and styles - Overleaf, Online LaTeX Editor

设置表格长度

\setlength\tabcolsep{2pt}

参考链接： horizontal alignment - table too wide and doesn't fit within textwidth - TeX - LaTeX Stack Exchange
tabular - LaTeX table too wide. How to make it fit? - Stack Overflow

## 顶部导入所需包
\usepackage{array}
\setlength\extrarowheight{2pt}

\begin{document}

\begin{table}[htbp]
        \centering
        \small 
        \setlength\tabcolsep{2pt}
        \begin{tabular}{|c|c|c|c|c|c|c|c|c|}
        ..........   
        ..........
        ..........
        \end{tabular}
        \caption{Laser specifications}
        \label{tab:Laser_Specs}
    \end{table}