High-power femtosecond pulse generation in a passively mode-locked Nd:SrLaAlO₄ laser

Abstract

A high optical quality Nd:SrLaAlO4 (Nd:SLA) crystal was grown using the Czochralski method and showed broad fluorescence spectrum with a full width at half maximum value of 34 nm, which is beneficial for generating femtosecond laser pulses. A stable diode-pumped passively mode-locked femtosecond Nd:SLA laser with 458 fs pulse duration was achieved for the first time at a central wavelength of 1077.9 nm. The average output power of the continuous-wave mode-locked laser was 520 mW and the repetition rate was 78.5 MHz.

Watt-Level Continuous-Wave Mode-Locked Nd:YVO4 Laser With ReSe2 Saturable Absorber

“…Note that the pulse duration of 2.29 ns is wider than common CWML ultrashort pulses. CWML pulse widths are usually limited to wider scales because of a narrow gain linewidth of Nd 3+ doped crystal [6]. In addition, although the diffusion-bonded crystal, YVO4/Nd:YVO4, can usefully reduce the thermal effects, the mode-locked pulse width is usually broader than that obtained with the conventional crystal [49].…”

“…It needs to mention that the obtained mode-locked pulses were measured by a 500 MHz bandwidth of oscilloscope which is adequate to get nanoseconds pulse width [35,54]. When further to reveal the instantaneous details of continuous-wave mode-locked pulses, it is required to employ autocorrelator instead of oscilloscope [6,33]. As shown in Fig.…”

“…The nonlinear saturable absorption of Cr 4+ :YAG can be effective only working around 900-1200 nm. Alternatively, semiconductor saturable-absorber mirrors (SESAMs) were exploited to generate passively mode-locked ultrashort pulses [6][7][8][9]. The complicated preparation of SESAMs involves expensive metal organic chemical vapor deposition (MOCVD) technique with extra high cost.…”

Tunable and Passively Mode-Locking Nd0.01:Gd0.89La0.1NbO4 Picosecond Laser

“…obtained 3.8 ps pulse duration at a repetition rate of 112 MHz in a Nd:GdYVO 4 crystal. Previously, theoretical and experimental results have demonstrated that Nd 3+ -doped disordered crystals possess broad emission spectra and are suitable for generating ultrashort lasers [ 11 , 12 , 13 ].…”

Tunable laser operations in a Nd-doped SrLaAlO4 crystal

“…14,15 A lot of research has been done to demonstrate the spectral characteristics. For example, a 458 fs stable mode-locked Nd:SLA laser was rst realized by S. D. Liu et al 16 with an output power of 0.52 W. Unfortunately, there is no research on this Nd:SLA tunable laser. Therefore, it is signicant to study the tunable properties of the Nd:SLA crystal and to further reveal a potential application in the eld of atom and molecular spectroscopy.…”