High power and high beam quality continuous wave Tm:YLF laser by the dual-end-pumped is presented in this letter. The highest output power reaches 21.3 W when the totally input pump power is 54.6 W. The optical conversion efficiency is 39.0% and the slope efficiency is 47.3%. With an F-P etalon in the cavity, the output center wavelength is tuned to 1908 nm with about 0.5 nm FWHM. With the optimal cavity, the beam quality factor M 2 can be ∼ 1.1. As we know, our work is the first time to investigate the Tm:YLF laser output spectrum with an F-P etalon in the cavity, and acquire near-diffraction limited laser output. Output power, W 25 20 15 10 5 0 60 50 40 30 20 10 0 Incident pumped power, W
A diode-end-pumped acousto-optically Q-switched Nd:YVO4 914 nm laser with 2.4 W output power is reported for the first time. With intracavity frequency doubling using a 10-mm-long LBO, a maximum 457 nm blue output power of 526 mW is achieved at a repetition rate of 20 kHz. The conversion efficiency from the corresponding Q-switched fundamental output to blue output is 42%. The peak power of the Q-switched blue pulse is up to 175 W with 150 ns pulse duration. The fluctuation of the blue output power is less than 2.0% at the maximum output power. Incident pump power, W
We demonstrated a 1.91 μm pumped, injection-seeded Q-switched Ho:YAG laser operating at room temperature. By inserting two Fabry-Perot etalons into the laser cavity, single-frequency Tm, Ho:YAG seed lasing was achieved at a wavelength of 2090.9 nm, with a typical output power of 60 mW. Single-frequency, nearly transform-limited Q-switched operation of the Ho:YAG laser was achieved by injection seeding. The output energy of the single-frequency Q-switched pulse is 7.6 mJ, with a pulse width of 132 ns and a repetition rate of 100 Hz. We measured the pulse spectrum, half-width of which was 3.5 MHz, by a heterodyne technique.
Abstract:We present experimental investigation on quasi-threelevel operation of Nd:GdVO4 laser under 879 nm laser diode pumping into the emitting level. By using a 5-mm-long, 0.2-at.% bulk crystal, the maximal 3.65 W continuous wave 912 nm laser is obtained under 16.5 W pump power. The slope efficiency is 35.9% and the optical conversion efficiency is 22.1% with respect to the absorbed pump power. The beam quality factor is about 1.83 for 3.0 W output power at 912 nm. The good results demonstrate that the 879 nm direct pumping can also be used in the quasi-three-level systems.
Lasing characteristics of a CW Tm:LuAG with a set of double cavity is presented in this letter. As the air gap etalon keeping at 342 µm, the highest output power reaches 107.8 mW when the totally input pump power is 1.95 W. The output center wavelength is 2027.0 nm. A single longitude mode output power of 17.1 mW is obtained when incident pump power is 855.1 mW. With the changing of DC voltage on the Piezoelectric Transducer (PZT) holding the output coupler, the reflection of the effective mirror changes correspondingly. The oscillating wavelength shifts from 2022 nm to 2031 nm. To our knowledge, this work is the first time to investigate the double cavity design in Tm:LuAG to achieve single longitude mode and tuning oscillation wavelength output laser. Output power, a.u.
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