Robust simultaneous multiwavelength bulk laser based on Yb:LaMgB 5 O 10 crystal: from continuous wave to ultrashort pulses

We present a robust simultaneous multiwavelength bulk laser based on Yb:LaMgB 5 O 10 (Yb:LMB) crystal, including its continuous-wave (CW) and ultrafast pulsed regimes. CW dual wavelengths at 1077 nm and 1091 nm with an average output power of 2.67 W were achieved with a 1% output coupling (OC). A maximum output power of 4.42 W with triple wavelengths of 1056, 1077, and 1091 nm was generated with 3% OC. In the case of 25% OC, the Yb:LMB laser can operate with four wavelengths (1025.1, 1031.4, 1033.2, and 1053.3 nm), producing an average output power of up to 4.44 W. Furthermore, 568 fs pulses with an average power of 470 mW were obtained at 1057.4, 1079.2, and 1092.4 nm from a synchronous tri-wavelength mode-locked Yb:LMB laser. These pulses are the shortest ever reported from a synchronous tri-wavelength mode-locked bulk laser. The detected frequency beating pulses had a primary interval of 0.11 ps and a full width at half maximum of 77 fs. Results indicated that equal spectral separation between each wavelength is not an essential factor for establishing a synchronous tri-wavelength mode-locking operation.