Abstract
An actively Q-switched all-solid-state YVO4 Raman laser, which used a 885-nm side-pumped Nd:YAG laser as the fundamental wavelength and delivered yellow output, is demonstrated. An in-band pump scheme is adopted to mitigate the thermal effects in the laser crystal and a Z-shaped laser cavity is used to compensate thermal lensing further. By intracavity frequency doubling of the Stokes wave with KTP crystal, 13.7-W yellow output at a wavelength of 588 nm, with a pulse repletion frequency of 10 kHz, was obtained under a diode pump power of 233 W. Additionally, single-pulse energy was 1.37 mJ with the pulse-width of 12.5 ns, corresponding to a peak power of 110 kW.
Highlights
Yellow-orange lasers in the spectral range of 560–600 nm have been used in various applications, including laser guide star systems, laser therapy, and laser Doppler velocimetry [1]–[3]
Most laser frequencies in this region can be generated by several approaches, such as laser diode (LD)pumped Pr3+/Tb3+-doped lasers [4], sum-frequency mixing of two Nd3+-doped laser lines [5]–[7], optical parametric oscillators [8]–[10], dye lasers [11], and fiber or all-solid-state Raman lasers [12]–[23].Compared with other techniques, the beam cleanup effect of stimulated Raman scattering (SRS) helps Raman lasers realize good beam quality and hole-burning-free SRS gain can narrow the spectral linewidth [24]–[26]
The yellow output (SRS) threshold is 82 W and a maximum average output power of 10.1 W is obtained under a launched pump power of 190 W, with a corresponding optical efficiency of 5.3%
Summary
Yellow-orange lasers in the spectral range of 560–600 nm have been used in various applications, including laser guide star systems, laser therapy, and laser Doppler velocimetry [1]–[3]. Most laser frequencies in this region can be generated by several approaches, such as laser diode (LD)pumped Pr3+/Tb3+-doped lasers [4], sum-frequency mixing of two Nd3+-doped laser lines [5]–[7], optical parametric oscillators [8]–[10], dye lasers [11], and fiber or all-solid-state Raman lasers [12]–[23].Compared with other techniques, the beam cleanup effect of stimulated Raman scattering (SRS) helps Raman lasers realize good beam quality and hole-burning-free SRS gain can narrow the spectral linewidth [24]–[26]. Compared with other methods, all-solid-state Raman lasers are the appropriate method to obtain yellow coherent light with good beam quality, large single-pulse energy, narrow linewidth etc
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