Broadband tunable single-frequency Nd:YVO₄/LBO green laser with high output power

Abstract

We present a diode-pumped broadband tunable single-frequency and frequency-doubling Nd:YVO4/LBO laser with high output power of 10.5 W in all tuning ranges around 532 nm. An etalon placed inside the resonator and the laser gain medium in a wedge shape are used for the coarse- and fine-tuning elements, respectively. By independently scanning the temperatures of the two tuning elements, broadband tunable ranges of 12 and 24 GHz have been achieved, respectively, for the fundamental and the second-harmonic waves.

240-GHz continuously frequency-tuneable Nd:YVO_4/LBO laser with two intra-cavity locked etalons

“…Therefore, the entire smooth scanning range achieved for the second harmonic radiation is 240-GHz wide and consists of 17 spectrally stitched individual continuous tuning ranges with the average width of ~14.5 GHz. It is pertinent to note that the term "generation frequency tuning" used in numerous publications on single-frequency Nd:YVO 4 lasers [9][10][11][12][13][14][15][16] does not always imply smooth adjustment of the laser's output frequency. This term may refer, for instance, to the possibility of setting any (or a specific) wavelength within the specified spectral range.…”

“…Continuous generation frequency tuning in Nd:YVO 4 /NC lasers over ranges exceeding the FSR of the laser cavity was earlier reported in various publications where the following continuous frequency tuning ranges of the second-harmonic radiation (532 nm) at the specified output power were demonstrated: 6.4 GHz @ 18 W [8], 8.2 GHz @ 12 W [8], 17 GHz @ 200 mW [9], 17.2 GHz @ 480 mW [10], 24 GHz @ 10.5 W [11], 60 GHz @ 1.5W [12]. Continuous (without mode hopping) tuning of the fundamental harmonic frequency in Nd:YVO 4 lasers was previously achieved in the ranges 2.9 GHz [13], and 107 GHz @ 103 mW [2].…”

A tunable single-frequency green laser based on a wedged Nd:YVO4 crystal and a KTP crystal

“…For precise interferometry applications, a precise wavelength control of the single frequency laser is needed, so tuning of the laser wavelength is also a desirable feature. The well-known tunable single frequency 532 nm laser is achieved with a unidirectional ring laser [1,2] or by inserting an etalon [3,4] in a standing-wave cavity. A unidirectional ring laser requires many components in the resonator, and an etalon is also needed for linewidth compression and wavelength tuning.…”

High-power CW single-frequency Nd:YVO4/LBO laser quasi-continuously tuneable over a wide frequency range

“…Among possible actuator types, which may provide relatively high continuously controllable excursion of the resonator length, one could mention electro-optical elements [5] and those relying on thermal expansion [3,6]. However, these methods are normally used to tune the laser output frequency within the FSR of the laser cavity [7], and usually they *d.radnatarov@gmail.com; phone 7 383 363-4265; fax 7 383 363-4265; http://www.nsu.ru/srd/lls/english/index.htm don't cover tuning ranges over 1 GHz.…”

“…In many laser systems, the maximal etalon modulation amplitude cannot exceed the FSR of the laser cavity. Nevertheless, in lasers with highly efficient intra-cavity frequency doubling, the effect of self-suppression of neighbouring modes [14] relaxes this requirement, and the etalon modulation amplitude may be wider than the laser cavity FSR [6,15]. This work presents for the first time a laser system based on a diode-pumped solid-state Nd:YVO 4 ring laser with intracavity frequency doubling in a non-linear LBO crystal with active etalon synchronisation.…”