Figure 2
From: 152 fs nanotube-mode-locked thulium-doped all-fiber laser
Laser setup.
EDFA: erbium-doped fiber amplifier. WDM: wavelength division multiplexer. TDF: thulium-doped fiber. ISO: isolator. NDF: normal dispersion fiber. OC: optical coupler. PC: polarization controller. CNT-SA: carbon nanotube saturable absorber. Inset: photograph of an integrated CNT-SA.
