Single-longitudinal mode Nd:YVO4/YVO4/KTP green solid state laser

Abstract

We present the concept and practical realization of a single frequency, tuneable diode pumped Nd:YVO4/YVO4/KTP microchip laser operating at 532 nm. Theoretical analysis of the single mode operation of such a laser configuration is presented. The single frequency operation has been obtained in a birefringent filter, where an YVO4 beam displacer acts as an ideal polarizer. Experimental results are in good agreement with theoretical analysis. We have obtained stable single frequency operation, tuneable over 0.6 nm in the spectral range around 1064 nm. The laser operated with output power up to 110 mW at 53 nm. The total optical efficiency (808 nm to 532 nm) was 14%.

Development and optimization of single-mode green solid state microchip laser

“…Besides those temperatures the laser generated two frequencies spaced about 1.2nm. The spectral range between them was comparable with the birefringent filter period calculated for the 5.1 mm long KTP crystal 20 The maximum output power in the single frequency regime was at the level of 115 mW@532 nm at 13% optical to optical efficiency. Fig.…”

“…The main drawback of this configuration is the need of Brewster plate precise aligning. That inconvenience was eliminated by replacing the Brewster plate with YVO 4 beam displacers 20,21 . The laser using that birefringent filter can be made as monolithic and needs only three crystal to create the laser resonator in comparison to four crystals required to build the green laser with bidirectional traveling-waves 16 .…”

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.…”

“…This term may refer, for instance, to the possibility of setting any (or a specific) wavelength within the specified spectral range. Generally, this does not preclude mode hopping in the process of frequency tuning [12,[14][15][16] and furthermore does not guarantee automatic continuous or quasi-continuous scanning of the generation frequency over the entire specified spectral range.…”

Single frequency monolithic green DPSS laser

“…Single mode operation can also be obtained in a laser configuration with a birefringent filter, where the filter is formed by Brewster plate and KTP crystal 10,11,12 . Author of the paper presented modified birefringent filter 13 . The Brewster plate was replaced with beam displacer.…”