Dual-wavelength synchronously mode-locked Nd:CNGG laser

Abstract

We have experimentally demonstrated a dual-wavelength synchronously mode-locked Nd:CNGG laser based on the semiconductor saturable absorber mirror technique. Mode locking was achieved simultaneously on two gain bands of the crystal that have a central wavelength separation of 2.4 nm. The fundamental mode-locked pulse train has a repetition rate of 88 MHz and pulse duration of 5 ps, with an average output power of approximately 90 mW. Autocorrelation measurements show that each of the synchronously mode-locked pulses consists of a train of quasi-periodic beat pulses with a 660 fs pulse width and a 0.63 THz repetition rate.

Dual-wavelength asynchronous and synchronous mode-locking operation by a Nd:CLTGG disordered crystal

“…8), by assuming sech 2 fit. Moreover, slight modulation was observed along the autocorrelation trace, which could be attributed to the optical beating between the pulses synchronously mode-locked at different wavelengths as discussed in [2,6]. The comparison between mode-locking performance in Nd:CLTGG and the known garnet crystals under diode-pumping is listed in Table 1.…”

“…Nd 3+ -doped disordered garnet crystals are believed to be the promising materials for their good mechanical and optical properties, as well as inhomogeneous broadening of absorption and emission bands. So far, several groups demonstrated the spectroscopic properties and laser performance of various disordered garnet crystals, such as Nd:CNGG [1,2], Nd:LGGG [3], Nd:CLNGG [4], Nd:CaSGG [5], Nd:CTGG [6], and Nd:GAGG [7]. By using most of these crystals, the mode-locked laser actions have been achieved with picosecond and femtosecond pulse duration [2-4, 6, 7], which are significantly shorter than that obtained with the ordered garnet crystal such as Nd:GGG [8] and Nd:YAG [9].…”

Diode-pumped passively mode-locked Nd:GYSGG laser

“…We attribute the deviation from the ideal time-bandwidth product of 0.315 to the fact that some dispersive effect is presence of in the cavity, if the cavity dispersion was compensated, the pulse duration can be suppressed further. Comparing with the performance of the different disordered crystals, such as Nd:CNGG [25], Nd:GAGG [21], Nd:CLNGG [18], and Nd:CTGG [24], the Nd:GYSGG crystal generates the highest average power, and the pulse width is shortest without dispersive compensation technique.…”

Tunable triple-wavelength mode-locked ytterbium fiber laser with birefringence filter

“…In particular, synchronous dual-wavelength femtosecond lasers have been widely researched with Ti:sapphire crystal as gain [3], and long wavelength gap and sub-fs timing jitter were further realized by using two laser gain media [4,5]. In addition,a dual-wavelength operation from a synchronously mode-locked Nd:CNGG laser has also been obtained, in which the separation between the two gain bands is 2.4 nm [6]. However, for synchronous triple-wavelength modelocked ultrafast laser, it is few reported because of the challenge technology and complex configuration [7].…”