SESAM Mode-Locked Yb:Ca3Gd2(BO3)4 Femtosecond Laser

Abstract

We report on the first passively mode-locked femtosecond-laser operation of a disordered Yb:Ca3Gd2(BO3)4 crystal using a SEmiconductor Saturable Absorber Mirror (SESAM). Pumping with a single-transverse mode fiber-coupled laser diode at 976 nm, nearly Fourier-transform-limited pulses as short as 96 fs are generated at 1045 nm with an average output power of 205 mW and a pulse repetition rate of ~67.3 MHz. In the continuous-wave regime, high slope efficiency up to 59.2% and low laser thresholds down to 25 mW are obtained. Continuous wavelength tuning between 1006–1074 nm (a tuning range of 68 nm) is demonstrated. Yb:Ca3Gd2(BO3)4 crystals are promising for the development of ultrafast lasers at ~1 μm.

Enhanced broadband NIR emission in glass–ceramic fibers containing Nd3+/Yb3+ co‐doped YCa4O(BO3)3 disordered nanocrystal

“…As discussed above, Nd 3+ ‐doped YCOB has a quite wide NIR emission band near 900 nm. Previous publications have indicated Yb 3+ ion doped disordered crystals have broadband spectra and excellent laser properties near NIR band 33,34 . For overcoming the bandwidth limitation of singly Nd 3+ or Yb 3+ ‐doped material, Yb 3+ is introduced to increase the gain bandwidth.…”

Exploration of the Crystal Growth and Crystal-Field Effect of Yb3+ in Orthorhombic GdScO3 and LaLuO3 Crystals

“…The disordered garnet crystal Yb:Ca 3 Li 0.275 Nb 1.775 Ga 2.95 O 12 (Yb:CLNGG) yielded a 55 fs mode-locked pulsed laser on account of a broad full width at half-maximum (FWHM) of the emission spectrum (20 nm) . For the Yb:M 3 RE 2 (BO 3 ) 4 (M = Ca, Sr, and Ba, RE = Gd, Y, Lu, and La) borate, varieties of Yb 3+ -doped sites effectively broadened the related emission spectra (with the FWHM of 66 nm), yielding a mode-locked laser with the pulse width reduced to 38 fs. − …”