WSe2 as a saturable absorber for multi-gigahertz Q-switched mode-locked waveguide lasers [Invited]

Ziqi Li; Rang Li; Chi Pang; Yuxia Zhang; Haohai Yu; Feng Chen

doi:10.3788/COL201917.020013

Journals >Chinese Optics Letters >Volume 17 >Issue 2 >Page 020013 > Article

Chinese Optics Letters
Vol. 17, Issue 2, 020013 (2019)

WSe₂ as a saturable absorber for multi-gigahertz Q-switched mode-locked waveguide lasers [Invited]

Ziqi Li¹, Rang Li¹, Chi Pang¹, Yuxia Zhang², Haohai Yu², and Feng Chen^1、*

Author Affiliations

¹School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

²State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, China

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DOI: 10.3788/COL201917.020013 Cite this Article Set citation alerts

Ziqi Li, Rang Li, Chi Pang, Yuxia Zhang, Haohai Yu, Feng Chen. WSe₂ as a saturable absorber for multi-gigahertz Q-switched mode-locked waveguide lasers [Invited][J]. Chinese Optics Letters, 2019, 17(2): 020013 Copy Citation Text

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Fig. 1. a, The AFM image of the WSe2 sample. b, The height profile image. c, The Raman spectrum under the excitation of 532 nm, and the inset is the optical image of the WSe2 sample. d, The linear absorption spectra of WSe2 and the substrate.

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Fig. 2. High-resolution X-ray photoelectron spectroscopy (HR-XPS) of CVD-grown WSe2 sample. a, The HR-XPS spectrum of W 4f. b, The HR-XPS spectrum of Se 3d.

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Fig. 3. Schematic diagram of the experimental setup of Q-switched mode-locked waveguide laser modulated by the WSe2 SA.

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Fig. 4. Average output power as a function of the input power. The inset shows the emission spectrum of the waveguide laser modulated by WSe2.

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Fig. 5. a, The Q-switched envelope containing mode-locked pulses on 40 ns timescale. b, The Q-switched envelopes on a larger time scale of 1 μs. c, The recorded mode-locked pulse trains on the picosecond timescale.

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Fig. 6. a, Recorded single mode-locked pulse train. b, The measured RF spectrum.

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	Parameters
2D Materials	Fabrication Method	Gain Media	Wavelength (nm)	Pulse Width (ps)	Frequency (GHz)	SNR (dB)	Ref.
Graphene	LPE	Tm:YAG	1943.5	$\sim 70$	7.8	–	[32]
Graphene	CVD	Ho:YAG	2091	$\sim 100$	5.9	–	[34]
Graphene	LPE	Yb:BG	1039	1.06	1.5	$\sim 50$	[33]
Graphene	CVD	Yb:Er-doped glass	1535	$\sim 70$	6.8	$\sim 30$	[40]
Graphene	CVD	$Nd : {YVO}_{4}$	1064	52	6.5	55	[35]
${MoS}_{2}$	CVD	$Nd : {YVO}_{4}$	1064	43	6.5	51	[35]
${Bi}_{2} {Se}_{3}$	CVD	$Nd : {YVO}_{4}$	1064	26	6.5	59	[35]
${WSe}_{2}$	CVD	$Nd : {YVO}_{4}$	1064	47	6.526	54	This work