Fig. 1. Designed structure of the SESAM.

Fig. 2. Experimental setup for characterization of the SESAM. Test laser, 1064 nm mode-locked fiber laser with a pulse energy of 5 μJ; $\lambda /2$, half-wave plate; $\lambda /4$, quarter-wave plate; PBS, polarization beam splitter; lens, with a 30 mm focal length.

Fig. 3. Nonlinear reflectivity measurements for the SESAM under test. The reflectivity is fitted with Eq. (1).

Fig. 4. Experimental setup of the mode-locked laser based on SESAM. Integrated SESAM including a 1064 nm collimator, a lens with a 15 mm focal length, and a SESAM mounted on a copper heat sink; Yb:fiber, Yb-doped fiber with an absorption coefficient of 5 dB/m at 975 nm; WDM, wavelength division multiplexer; FBG, fiber grating with a center wavelength of 1064 nm; diode laser, with a center wavelength at 975 nm.

Fig. 5. Image of the integrated SESAM.

Fig. 6. Pulse sequences from the SESAM mode-locked laser.

Fig. 7. (a) Measured pulse spectrum of the pulse train from the laser oscillator. (b) Intensity autocorrelation trace of the pulse train. (c) Measurement of output power as a function of pump power.

Table 1. Derived SESAM Parameters