High-power wavelength-tunable and power-ratio-controllable dual-wavelength operation at 1319  nm and 1338  nm in a Q-switched Nd:YAG laser

Abstract

We report the first demonstration on three types of 1.3 μm spectral region in a Q -switched Nd:YAG laser. In order to dissipate the heat deposition effectively to obtain good beam quality, the Nd:YAG rod crystal with 1° cut-angle on end faces is side-pumped by the quasi-continuous-wave pulsed laser diode. A Suprasil etalon is well designed as the intracavity mode-selector to obtain wavelength-tunable single line or power-ratio-controllable dual line operation at 1319 nm and 1338 nm. With the pump pulse width of 200 μs and pump power of 410 W, the acousto-optic Q -switched laser delivered a pulse width of 117 ns at 400 Hz repetition rate, and the M 2 factor was measured to be about 1.87. 1319 nm together with 1338 nm single-wavelength laser achieved an average output power of 47.6 W and 39.9 W with a linewidth of 0.48 nm and 0.32 nm, and a tunable range of 111.2 pm and 108.6 pm, respectively. Among dual-wavelength oscillation, both lines can be tuned at almost equal intensity level with 45.7 W total output power, which is input into an LBO crystal to generate red light of 11.4 W for 659 nm, 6.7 W for 664 nm, and 7.5 W for 669 nm. The 1.3 μm wavelength-selectable operation realized by using the same laser configuration may enhance the application in the fields of tunable lasers and THz frequency generation.

Partially end-pumped 1319 nm Nd:YAG slab laser

“…1319 nm waveband sets in the windows of air transparency and low-loss of quartz fiber. Laser in the 1319 nm spectral region is widely used in sodium beacon, optical communication and laser medical fields, and also an attractive alternative as pump source for generating a 4.3 μm output 1 . The neodymium ion (Nd 3+ )-doped laser crystal Nd:YAG is commonly adopted as the most promising gain media to achieve 1319 nm laser generation.…”

“…The neodymium ion (Nd 3+ )-doped laser crystal Nd:YAG is commonly adopted as the most promising gain media to achieve 1319 nm laser generation. Typically, a diode-side-pumped 1319 nm continuous wave laser with Nd:YAG rod 2 was reported in 2007, obtaining an output power up to 131 W. Also, powerratio-controllable dual-wavelength of 1319 nm/1338 nm output were realized by side-pumped Nd:YAG, further generating tunable wavelength laser by the frequency conversion technology 1 . However, it is still challenging to produce higher power single-wavelength 1319 nm laser output due to the mode competition and thermal effect of gain media.…”

Power ratio measurement of dual wavelength dye laser with picometer-level wavelength difference

“…When the wavelength difference is basically equal to or greater than 20 nm, beam filtering is generally used to measure the power separately. [6] In 2022, Qi Bian et al reported a Q-switched Nd:YAG laser to obtain power-ratiocontrollable dual line operation at1319 nm and 1338 nm. The power ratio of dual wavelength laser with wavelength difference of 19 nm was measured by beam filtering.…”

Hybrid Resonator 1319 nm Nd:YAG InnoSlab Laser

“…High-power diode pump solid-state lasers operating at 1319 nm have plenty of applications in the fields of sodium beacons, optical communication, and laser medical treatment, owing to the minimum dispersion for silica optical fiber and good absorption of water molecules [1,2]. Generally, the Nd:YAG laser pumped by 808 nm laser diode (LD) is an efficient alternative to achieving 1319 nm laser output due to the transitions between stark sub-levels corresponding to 4 F 3/2 → 4 I 13/2 energy levels of Nd 3+ ions [3].…”