研究目的
Investigating the use of quantum dots CdSe embedded in polymer film as a saturable absorber for passively Q-switched erbium-doped fiber lasers.
研究成果
The study successfully demonstrated a passively Q-switched EDFL operating at 1559.35 nm using a CdSe-PMMA based SA. The Q-switching operation was achieved with a pulse repetition rate from 33.2 to 68.45 kHz and pulse width from 10.04 to 4.30 μs, with a maximum pulse energy of 11.83 nJ. The results confirmed that CdSe-PMMA has good optical properties for SA applications in cost-effective Q-switched EDF lasers.
研究不足
The Q-switched pulses became unstable or disappeared at pump powers above 118 mW, attributed to over-saturation of the CdSe SA. The pulse width could be further reduced by shortening the laser cavity lifetime or improving the modulation depth of the CdSe PMMA based SA.
1：Experimental Design and Method Selection:
The study employed a passively Q-switched erbium-doped fiber laser (EDFL) setup using quantum dots (QD) CdSe as a saturable absorber (SA). The CdSe powder was synthesized and embedded into a poly(methyl methacrylate) (PMMA) film via emulsion polymerization process.
2：Sample Selection and Data Sources:
The CdSe powder was characterized using transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) to verify its nanoparticle size, composition, and crystal structure.
3：List of Experimental Equipment and Materials:
The experimental setup included a
4：4 m long Erbium-doped fiber (EDF) as the gain medium, pumped by a 980 nm laser diode via a 980/1550 nm wavelength division multiplexer (WDM). The CdSe PMMA SA device was inserted into the ring laser cavity. Experimental Procedures and Operational Workflow:
The Q-switched operation was achieved by varying the pump power within 30–118 mW. The output spectrum and pulse characteristics were measured using an optical spectrum analyzer (OSA) and a 500 MHz oscilloscope (OSC), respectively.
5：Data Analysis Methods:
The pulse repetition rate and pulse width were analyzed as functions of the incident pump power, and the average output power and pulse energy were calculated.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
