High-power diode-directly-pumped tenth-order harmonic mode-locked TEM00 Nd:YVO4 laser with 1 GHz repetition rate

High-power, 0.83-GHz-repetition-rate tenth-order harmonic mode-locked GdVO4/Nd:GdVO4 laser under diode direct pumping

“…The pulse-state performance of the laser was always accompanied by CW background. As there were no other nonlinear elements but the GdVO 4 /Nd:GdVO 4 crystal which has large positive third-order nonlinearity, the pulses could only be induced by the Kerr self-focusing effects of the laser crystal combined with a soft gain aperture due to the finite transversal size of the active region [17], while the wavepackets with ten equally spaced pulses per round trip was attributed to the colliding of the counter-propagating pulses in the crystal [16]. The plane end mirror was then slightly moved to change the cavity length until the amplitudes of the ten pulses in the wavepackets were approximately equal, where the total cavity optical length was about ten times of the distance L1 between the output coupler M1 and the nearest end of the laser crystal.…”

“…To reduce the thermal effects in the laser crystal, a growntogether composite GdVO 4 /Nd:GdVO 4 crystal (Beijing Ke-Gang Electro-Optics) was used as the laser gain medium and an 880 nm fiber-coupled laser diode (LD, DILAS) was used as the pump source for direct pumping [16]. With the composite crystal, the undoped GdVO 4 section serves as a heat sink for the pumping surface.…”

“…In [14], the HML pulses were due to the group-velocity mismatch between the fundamental and second-harmonic waves as well as cascaded second-order nonlinearity in the nonlinear crystal, while in [12,13], the generation of the HML pulses were caused by the colliding pulse mode locking (CPM) mechanism-that is, the Nth-order HML is obtained by placing a saturable absorber at the position of 1/N cavity length [15]. Recently, using the large third-order nonlinearity of the laser crystal, Li et al reported a tenth-order HML Nd:YVO 4 laser with a high output power of 10 W at 1 GHz-repetition-rate based on the Kerr self-focusing effects in the gain medium and the CPM mechanism [16].…”

7 W laser diode end-pumped Nd:YVO4 passively mode-locking laser with a semiconductor saturable absorber mirror

“…Among all the above, Nd:YVO 4 is specially suit for pico second laser due to its lager emission crossing and short life time [7][8][9][10]. According to the absorp tion spectrum of Nd:YVO 4 , 808 and 880 nm was the main two line for LD pumping source [11,12] and most research have chosen 808 nm for its larger absorption cross section.…”

Timing-jitter reduced high-repetition-rate Q-switched Nd:YVO4/Cr4+:YAG micro laser with low pump power

“…Nd:YVO 4 gain media are well used in modern laser systems [18,19] due to its strong absorbance to the pump beam, and high emission coefficient [2][3][4][20][21][22][23]. For wider applications the Nd:YVO 4 based lasers can be frequency converted to visible, UV, or mid infrared sources via nonlinear optical effect [24][25][26].…”