Institut de Microelectronique d’Electromagnetisme et de Photonique-Laboratoire d’Hyperfrequences et de Caracterisation, Grenoble-Institut National Polytechnique, 3 parvis Louis Neel, 38000 Grenoble, France.
A passively Q-switched dual-wavelength solid-state laser is presented. The two wavelengths are emitted by two different crystals in order to avoid gain competition, and the synchronization between the pulses is obtained by external triggering of the saturable absorber. Sum frequency mixing is demonstrated, proving the interest of this source for terahertz generation in the 0.3-0.4 THz range through difference frequency generation.
[Show abstract][Hide abstract] ABSTRACT: Using multilayered graphene as the saturable absorber (SA), Nd:LYSO crystal as the laser material, we demonstrated a laser-diode (LD) pumped, dual-wavelength passively Q-switched solid-state laser. The maximum average output power is 1.8 W, the largest pulse energy and highest peak power is 11.3 μJ, 118 W, respectively. As we have known, they are the best results for passively Q-switched operation of graphene. The pulse laser is strong enough to realize extra-cavity frequency conversions. With a KTP crystal as the sum-frequency generator, the dual wavelengths are proved to be well time overlapped, which manifests the synchronous modulation to the dual-wavelength with multi-layered graphene.
[Show abstract][Hide abstract] ABSTRACT: A two-frequency picosecond laser based on α-cut Nd:YVO4–YVO4 composite vanadate crystals is experimentally studied for the s-polarised radiation at the 4F3/2 – 4I11/2 transition with frequency tuning using Fabry–Perot etalons of different thickness. The difference between the radiation wavelengths was tuned within the range of 1.2–4.4 nm. In the mode-locking regime, the two-frequency radiation power was 280 mW at an absorbed pump power of 12 W.
[Show abstract][Hide abstract] ABSTRACT: We describe a compact dual-wavelength (1.047 and 1.053 μm) diode end-pumped Q -switched Nd:YLF laser source which has a number of applications in demand. In order to achieve its dual-wavelength operation it is suggested for the first time to use essentially nonmonotonous dependences of the threshold pump powers at these wavelengths on the cavity length in the region of the cavity semiconfocal configuration under a radius of the pump beam smaller than the radius of the zero Gaussian mode. Here we demonstrate one of the most interesting applications for this laser: difference frequency generation in a GaSe crystal at a frequency of 1.64 THz. A superconducting hot-electron bolometer is used to detect the THz power generated and to measure its pulse characteristics.
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