Tunable, passively Q-switched single-longitudinal-mode Nd:YVO4 laser using a chirped volume Bragg grating

Widely Wavelength-Tunable High Power Single-Longitudinal-Mode Fiber Laser in Mid-Infrared Waveband

“…Thus, other suppression mechanisms for longitudinal modes must exist. Due to the interference effect occurring between the longitudinal modes caused by the three-mirror cavity [21] and losses caused by the mirrors, lenses, coupling efficiency and the surrounding environment, longitudinal modes in the cavity will compete with each other and finally only those longitudinal modes which conform to the least common multiple of the frequency intervals for all individual FP cavities would survive. After this screening mechanism, some surviving longitudinal modes which are far away from the central longitudinal mode will suffer more losses and less gain due to the narrowband filter effect of the grating and finally are completely suppressed.…”

Actively Q-switched tunable single-longitudinal-mode 2 µm Tm:YAP laser using a transversally chirped volume Bragg grating

“…On this graph, it appears that the laser operating with the VBG as an output coupler is likely to be slightly multimode. Note that in [17], Seger et al observed that their VBG should not have enabled SLM operation of their Nd:YVO 4 laser. They resolved this point assuming that the spectral reduction was linked to unpredicted beneficial Fabry-Perot effect.…”

“…In [6], the wavelength was tuned from 1965 to 2000nm with a rotating volume Bragg grating used as folding mirror in the cavity. Seger et al exhibited single longitudinal mode operation in a passively Q-switched, Nd:YVO 4 microlaser tuned between 1063 and 1065 nm with a transversally chirped volume Bragg grating (TC-VBG) [17]. Table 1 sums up the characteristics of the lasers developed in the aforementioned works.…”

Tunable Narrowband Tm:YAP Laser using a Transversally Chirped Volume Bragg Grating

“…In this context we also need a narrow band spectrum to control the spectral output of the optical parametric oscillator, which is based on Vernier spectral filtering in doubly-resonant cavities. Seger and his team exhibited single longitudinal mode operation in a microlaser tuned with transversally chirped volume Bragg grating (TC-VBG) near 1 µm [3]. We show how this concept can be applied to a different laser emitting at 2 µm.…”