Ultra-broadband WS2-based saturable absorbers for erbium-doped fiber lasers

Countdown
0 days

Template for Manuscripts

Important Dates

Conference:

Aug. 18-20, 2018

Full Paper Due: Jul. 20, 2018

Abstract Due: Jul. 20, 2018

Audience Registration Due:
Aug. 18, 2018

Presentations of The Int'l Symposium on Photonics and Optoelectronics (SOPO 2016)

● Ultra-broadband WS2-based saturable absorbers for erbium-doped fiber lasers
Author(s)
Wenjun Liu
Affiliation(s)
Beijing University of Posts and Telecommunications
KEYWORDS
WS2-based saturable absorbers, erbium-doped fiber lasers
ABSTRACT
Saturable absorbers (SAs) can be used to generate ultrashort pulses in fiber lasers with self-starting operation and environmentally stable [1]. Compared to other SAs, the tapered fiber SAs have higher damage threshold, longer interaction length, and wider spectral width [2]. In this paper, the fiber-taper WS2-based SAs have been used in erbium-doped fiber (EDF) lasers as illustrated in Fig. 1. The SAs have been fabricated by depositing the WS2 on the tapered fiber with the pulsed laser deposition method. The length of the fiber-taper is 3 mm, and the waist is 12 μm. The saturable intensity is at of 34 MW/cm2, the modulation depth is 25.48%, and the non-saturable loss is 61% in Fig. 2. By rotating HWPs and QWPs in Fig. 1, the EDF laser can be mode-locking at 1540 nm. The fundamental cavity repetition rate is 135 MHz, the electrical signal to noise ratio (SNR) is 93 dB, and the timing jitter is 280 fs in Fig.3. The pulse duration is 67 fs, and the 3 dB spectral width is 114 nm, which is the widest spectrum for the same type fiber lasers. By using comparison experiment, we summarize the corresponding parameters for the different mode-locking scheme in Table 1. Those results demonstrate that the fiber-taper WS2-based SAs are promising devices for the ultra-broadband pulse generation.