1064-nm DFB laser diode modules applicable to seeder for pulse-on-demand fiber laser systems

• Published in: Optical fiber technology Vol. 20; no. 6; pp. 714 - 724
• Main Authors: Yokoyama, Yoshitaka, Takada, Kan, Kageyama, Takeo, Tanaka, Shin, Kondo, Hayato, Kanbe, Satoshi, Maeda, Yasunari, Mochida, Reio, Nishi, Kenichi, Yamamoto, Tsuyoshi, Takemasa, Keizo, Sugawara, Mitsuru, Arakawa, Yasuhiko
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01-12-2014
• Subjects: Fiber laser; Gain-switching; Pulse-on-demand; Semiconductor DFB laser; Gain-switching; Fiber laser; Semiconductor DFB laser; Pulse-on-demand
• ISSN: 1068-5200; 1095-9912
• DOI: 10.1016/j.yofte.2014.08.004

Semiconductor DFB (Distributed feedback) laser diodes with an operating wavelength of 1064nm, which is suitable for pulse-on-demand fiber laser, have been developed. The stable performance of CW and nanosecond/picosecond pulsed operation is reviewed. By applying gain-switching operation with a simple direct modulation technique, 50-ps pulse generation with a stable spectral single-mode property was obtained. For the efficient amplification of the obtained 50-ps pulse, a monolithic semiconductor optical amplifier (SOA) was integrated into the DFB lasers. An improved peak power of 300mW at 50-ps pulse was observed with limited optical noise injection when the synchronous modulation technique of the DFB and the SOA was employed. Short cavity lasers showed a high-frequency response compared to the original DFB lasers and achieved a short pulse width of 13ps by standard gain-switched operation.