A single-frequency Ho:YAG laser with bow-tie architecture injected by different polarized seeders

Abstract

The performance of a single-frequency Ho:YAG laser with bow-tie cavity injected by different polarized seed lasers is studied both theoretically and experimentally. With vertically polarized (s-polarized) seeding, a 9.7 mJ single-frequency laser with a pulse width of 183 ns at the repetition rate of 252 Hz is obtained. With horizontally polarized (p-polarized) seeding, an 8.8 mJ single-frequency laser with a pulse width of 220 ns at the repetition rate of 252 Hz is obtained. The laser operating in p-polarized seeding mode performs better than the one operating in s-polarized seeding because of the stable relative center frequency of the pulses (0.9 MHz in 1 h).

A 3-kHz Er:YAG single-frequency laser with a ‘triple-reflection’ configuration on a piezoelectric actuator*

“…An isolator is set to protect the NPRO to prevent the feedback leaked from the amplifier. By rotating the half-wave plate, before passing through the polarizing beam splitter (PBS), the seed laser is divided into two parts: the one part (500 mW) is p-polarized, injected into the slave cavity for seed with p-polarization has much sharper resonance signal which has a benefit for injection seeding, [16] the other part (200 mW) is used as the reference for heterodyne beating with single frequency pulses. M9, M10 are 45 • flat mirrors for folding the seed laser into the salve resonator.…”

Narrow‐linewidth injection‐locked Ho:YAG laser by using thulium‐doped fiber laser as pumping source

“…20 Next, they reported a Ho:YAG injection-locked Q-switching laser delivering a pulse energy of 9.7 mJ, corresponding to a 183 ns pulse duration at 252 Hz. 21 To meet the requirements of a lidar system for 2.09 μm single-frequency pulsed laser sources with high energy, an effective method of oscillator-amplifier system 22 is generally adopted. In 2017, Wang et al presented an oscillator-amplifier structure comprised of a Ho:YAG injection-locked pulsed master oscillator and a single-pass amplifier.…”

“…A maximum single‐frequency pulsed energy of 15.15 mJ for 109 ns pulse width at 200 Hz was realized 20 . Next, they reported a Ho:YAG injection‐locked Q‐switching laser delivering a pulse energy of 9.7 mJ, corresponding to a 183 ns pulse duration at 252 Hz 21 . To meet the requirements of a lidar system for 2.09 μm single‐frequency pulsed laser sources with high energy, an effective method of oscillator‐amplifier system 22 is generally adopted.…”

High-energy, alignment-insensitive, injection-seeded Q-switched Ho:yttrium aluminum garnet single-frequency laser

“…In the same year, Na et al [ 10 ] used the same seed laser to achieve an injection-seeded Ho:YAG laser and increased the repetition rate to 1 kHz. Subsequently, Na et al [ 11 ] investigated the effect of the polarization state of the Ho:YAG NPRO seed laser on the output characteristics of the injection-seeded Ho:YAG laser. From the above results, it can be seen that among injection-seeded lasers, NPRO and linear cavities with Fabry–Pérot etalons are the most common seed lasers.…”