Photonics Research, Volume. 7, Issue 7, 798(2019)
Acousto-optic tunable ultrafast laser with vector-mode-coupling-induced polarization conversion
Fig. 1. Laser polarization conversions of core vector modes. Laser mode over-coupling process is induced by the AOI between the core vector mode
Fig. 2. Experimental setup of the tunable ultrafast fiber laser whose mode-locking property and tunability are achieved by an SWCNT-SA and AOI, respectively.
Fig. 3. (a) Photograph of the etched SMF with a diameter of 30 μm. (b) Absorptivity of the fiber-ferule SA with different pump peak intensities and the corresponding nonlinear fitting curve; the inset is the photograph of the SWCNT-SA. The SWCNT film is shown within the red circle.
Fig. 4. Characterization of the tunable band-pass spectral property: (a) conversion of the transmission spectrum from band-injection to band-pass, corresponding to different relative polarization states of PCs 1 and 2; (b) transmission spectra of the AIFG with different driving signal frequencies; (c) corresponding peak wavelengths with different acoustic wave frequencies; (d) AOI wavelength-switch response time.
Fig. 5. Characterization of the soliton operation: (a) output spectra with and without the acoustic wave driving; inset is an enlargement of the local spectrum near the center wavelength; (b) pulse train in time domain; (c) radio-frequency spectrum of the fundamental frequency component; (d) autocorrelation trace and its sech2 fitting curve.
Fig. 6. Laser tuning test. (a) Transmission spectra of the AIFG and the output laser with the same driving frequency of 1.049 MHz, where the green shaded area represents the wavelength range within the 3 dB bandwidth of the transmission spectrum. (b) Spectral evolution with increment of the driving frequency from 1.039 to 1.069 MHz. (c) Spectral evolution with a smaller driving frequency interval of 1 kHz, where the two dashed lines are aligned with the corresponding color-coded laser spectra.
Fig. 7. (a) Autocorrelation trace (dashed line) and the
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Yujia Li, Ligang Huang, Haonan Han, Lei Gao, Yulong Cao, Yuan Gong, Wending Zhang, Feng Gao, Iroegbu Paul Ikechukwu, Tao Zhu. Acousto-optic tunable ultrafast laser with vector-mode-coupling-induced polarization conversion[J]. Photonics Research, 2019, 7(7): 798
Category: Ultrafast Optics
Received: Mar. 6, 2019
Accepted: May. 13, 2019
Published Online: Jun. 21, 2019
The Author Email: Ligang Huang (lghuang@cqu.edu.cn)