Date of download: 6/1/2016 Copyright © 2016 SPIE. All rights reserved. (a) The schematic diagram and (b) the photograph of the graphene saturable absorber (SA). Figure Legend: From: Monolayer graphene saturable absorber with sandwich structure for ultrafast solid- state laser Opt. Eng. 2015;55(8): doi: /1.OE

Date of download: 6/1/2016 Copyright © 2016 SPIE. All rights reserved. (a) Optical microscope image of the transferred graphene film located between cover glass plates. (b) The transmittance spectrum of graphene-SA. Figure Legend: From: Monolayer graphene saturable absorber with sandwich structure for ultrafast solid- state laser Opt. Eng. 2015;55(8): doi: /1.OE

Date of download: 6/1/2016 Copyright © 2016 SPIE. All rights reserved. Raman spectrum of graphene-SA. Figure Legend: From: Monolayer graphene saturable absorber with sandwich structure for ultrafast solid- state laser Opt. Eng. 2015;55(8): doi: /1.OE

Date of download: 6/1/2016 Copyright © 2016 SPIE. All rights reserved. Configuration of the graphene mode-locked laser. LD: laser diode; M1: a plane dichroic mirror; M2: the output coupler (R2=200 mm); the cavity mirrors M3 (R3=800 mm), M4 (R4=100 mm), and M5 (flat mirror); graphene-SA: graphene saturable absorber. Figure Legend: From: Monolayer graphene saturable absorber with sandwich structure for ultrafast solid- state laser Opt. Eng. 2015;55(8): doi: /1.OE

Date of download: 6/1/2016 Copyright © 2016 SPIE. All rights reserved. (a) Average output power as a function of absorbed pump power in continuous wave (CW) and mode-locking regimes. Inset: the two-dimensional and three-dimensional images of far-field intensity distribution of the output beam for the CW mode-locked situation at maximum output power in single-pulse regime. (b) Mode-locked pulse trains recorded in 20 μs and 10 ns/division (div) time scales. (c) Autocorrelation trace of the 883-fs pulse. (d) The corresponding spectrum of the CW mode-locked laser centered at 1042 nm. Figure Legend: From: Monolayer graphene saturable absorber with sandwich structure for ultrafast solid- state laser Opt. Eng. 2015;55(8): doi: /1.OE