Radiation characteristics of a Free-Electron Laser (FEL) such as pulse length, time structure, intensity, bandwidth, wavelength, power, frequency, etc., which were measured on a diagnostics table, are thoroughly discussed. In this respect, pulse length measurements of an Infrared FEL (IR-FEL) beam are evaluated through an intensity autocorrelator, designed and installed as a diagnostics tool at the “Helmholtz-Zentrum Dresden-Rossendorf (HZDR)-Radiation Source ELBE” of Germany. In addition, the autocorrelator was designed as a unique, cost-effective, and in-house setup. It operates within the wavelength range of 3–35microns, using Cadmium-Telluride (CdTe) crystals in the Second Harmonic Generation (SHG) medium. The intensity autocorrelation curves were obtained for the FEL beam with the wavelength of 26.2microns, indicating an FWHM pulse duration ranging between 3.29–8.03 ps with different optical cavity detuning values. Furthermore, the pulse duration of Ti:sapphire laser beam is measured between 1–3 ps through the designed autocorrelator at the ELBE light source. On the other hand, the setup may pave the way for pulse length measurements of the Turkish infrared FEL-oscillator facility (TARLA) as well, which is currently under the hardware installation phase. Finally, it is elaborated in section 3 that the unique autocorrelator design fully meets all requirements for pulse length measurements of an infrared FEL source.

彻底讨论了在诊断表上测量的自由电子激光器 (FEL) 的辐射特性，例如脉冲长度、时间结构、强度、带宽、波长、功率、频率等。在这方面，红外 FEL (IR-FEL) 光束的脉冲长度测量通过强度自相关器进行评估，该自相关器作为诊断工具设计并安装在德国的“Helmholtz-Zentrum Dresden-Rossendorf (HZDR)-Radiation Source ELBE” . 此外，自相关器被设计为独特的、具有成本效益的内部设置。它在 3–35 微米的波长范围内工作，在二次谐波 (SHG) 介质中使用碲化镉 (CdTe) 晶体。获得了波长为 26.2 微米的 FEL 光束的强度自相关曲线，表明具有不同光学腔失谐值的 FWHM 脉冲持续时间在 3.29-8.03 ps 之间。此外，通过 ELBE 光源处设计的自相关器在 1-3 ps 之间测量 Ti：蓝宝石激光束的脉冲持续时间。另一方面，该设置也可能为土耳其红外 FEL 振荡器设施 (TARLA) 的脉冲长度测量铺平道路，该设施目前正处于硬件安装阶段。最后，在第 3 节中详细说明了独特的自相关器设计完全满足红外 FEL 源脉冲长度测量的所有要求。该设置也可能为土耳其红外 FEL 振荡器设施 (TARLA) 的脉冲长度测量铺平道路，该设施目前正处于硬件安装阶段。最后，在第 3 节中详细说明了独特的自相关器设计完全满足红外 FEL 源脉冲长度测量的所有要求。该设置也可能为土耳其红外 FEL 振荡器设施 (TARLA) 的脉冲长度测量铺平道路，该设施目前正处于硬件安装阶段。最后，在第 3 节中详细说明了独特的自相关器设计完全满足红外 FEL 源脉冲长度测量的所有要求。