Abstract
Circular, buried depressed-cladding waveguides were inscribed by direct fs-laser beam writing in diffusion-bonded Nd:YAG/Cr4+:YAG composite media. Passive Q-switch operation was achieved using the pump at 807 nm with a fiber-coupled diode laser. Laser pulses at 1.06 μm with energy of 15.7 μJ and 3.9-ns duration (corresponding to a peak power of 4.0 kW) were obtained from a waveguide of 150-μm diameter that was realized in a 10.3-mm long, 1.0-at.% Nd:YAG/Cr4+:YAG composite medium. The length of Nd:YAG crystal was 7.0 mm and initial transmission of Cr4+:YAG saturable absorber crystal was 0.70. The average output power reached 1.13 W.
Highlights
A large variety of photonic systems can be built in many configurations, being designed to include various compact or miniature laser sources, such as waveguide lasers [1,2]
We have reported passive Q-switching with Cr4+:YAG saturable absorber (SA) of a circular buried depressed-cladding waveguide that was inscribed in Nd:YAG ceramics; the pump was done with a fiber-coupled diode laser, but still the SA crystal was positioned nearby the waveguide [17]
The laser pulse energy and duration was 19.7 μJ and 2.8 ns, corresponding to a laser peak power of 7 kW. These results show that Cr4+:YAG SA is a good choice for obtaining laser pulses at 1.06 μm with both high energy and high peak power, whereas integration as well as the pump with a fiber-coupled diode laser could further increase the interest for such miniature devices
Summary
A large variety of photonic systems can be built in many configurations, being designed to include various compact or miniature laser sources, such as waveguide lasers [1,2]. A single-layer graphene was used to obtain mode-locking in an elliptical buried depressed-cladding waveguide that was inscribed in Nd:YAG; the laser delivered pulses with tp = 16 ps and repetition rate up to fp = 11.3 GHz (average power Pave = 12 mW) [27]. We have reported passive Q-switching with Cr4+:YAG SA of a circular buried depressed-cladding waveguide that was inscribed in Nd:YAG ceramics; the pump was done with a fiber-coupled diode laser, but still the SA crystal was positioned nearby the waveguide [17]. The average output power was Pave = 1.13 W This seems to be the first demonstration of a circular, buried depressed-cladding waveguide that was inscribed by fs-laser beam in a Nd:YAG/Cr4+:YAG composite medium and that was pumped with fiber-coupled diode laser to deliver watt-level average power at 1.06 μm in passive Q-switch regime
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