Diode-pumped cw tunable two-frequency YAG:Nd 3+ laser with coupled resonators

The influence of dispersion in resonator elements on the characteristics of two-frequency generation of a diode-pumped Nd:YAG laser

“…He-Ne gas lasers operating at λ = 0.63 μm are usually used for these purposes. Two-frequency generation with a beat frequency of tens and hundreds of megahertz can also be achieved in compact diode-pumped solid-state lasers [2].…”

“…The scheme of the laser was described in detail [2]. A composite resonator containing two additional Fabry-Perot interferometers was used in order to isolate initially a single longitudinal mode.…”

“…He-Ne gas lasers operating at λ = 0.63 μm are usually used for these purposes. Two-frequency generation with a beat frequency of tens and hundreds of megahertz can also be achieved in compact diode-pumped solid-state lasers [2].The two-frequency mode is usually produced by isolating a single longitudinal mode and splitting it into orthogonally polarized components using a phase anisotropy resonator. A magnetic field imposed on the active medium is used for this in He-Ne lasers.…”

Frequency Difference Thermally and Electrically Tunable Dual-Frequency Nd:YAG/LiTaO3 Microchip Laser

“…The He-Ne dual-frequency laser based on the birefringent effect has a frequency difference lock-in of about 40 MHz [19]. As far as we know, there is no report on the frequency of the lock-in phenomenon in solid-state dual-frequency lasers, while a quite low beat frequency can be achieved [20]. Considering the c-cut condition of the LTO crystal, the light oscillates parallel to the optical axis in the resonant In the experiment, we observed that as the frequency of the two orthogonally polarized beams got quite close, one of them was extinguished, resulting in a single polarization output.…”

Advances of Research on Dual-Frequency Solid-State Lasers for Synthetic-Wave Absolute-Distance Interferometry

“…Many experts and scholars worldwide have investigated the oscillating principles and key technologies of dual-frequency solid-state lasers with tunable and large frequency difference since 2000 [ 14 , 15 , 16 , 17 , 18 , 19 ], and they have successfully developed a series of new dual-frequency solid-state lasers, such as the birefringent dual-frequency solid-state laser [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ], the biaxial dual-frequency solid-state laser [ 31 , 32 ], the two-cavity dual-frequency Nd:YAG laser (TCDFL) [ 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ], and so on. Especially in the recent years, our research group has made important progresses in the research and development of the TCDFL and its quadrature-demodulated Pound–Drever–Hall (QD-PDH) frequency-stabilizing technology [ 41 , 42 ], and the QD-PDH frequency-stabilizing method has been applied to the frequency-difference stabilization of the TCDFL with a frequency difference of 24 GHz at 1064 nm [ 43 , 44 ].…”