We report here on ultra-compact diode-pumped single frequency, TEMoo mode Nd:YVO4 lasers at 1064 nm and 1340 nm. The lasers incorporate coupled cavity design operating in single longitudinal mode with a line-width of less than 20 kHz and frequency drift of 50 MHz over 10 minutes. These lasers produce more than 500 mW output at 1064 nm and more than 200 mW output at 1340 nm wavelength and are pumped by a 1.2 W laser diode. In addition, the lasers also feature excellent output stability with a output power variation of less than 1% over 8 hours and less than 0.2% amplitude noise in the 10 Hz to 50 MHz frequency range. The dimensions of the laser head are 3 X 3 X 12 cm and the universal 100 to 240 VAC input power control unit has been dimensions of 5 X 14 X cm. The total power consumption of the laser system is only 12 W. Therefore these ultra-compact, single frequency lasers will have a great potential for analytical instrumentation, Raman spectroscopy, biomedical diagnostics, optical communication as well as space exploration.
We report here on a new compact frequency-doubled Nd:YVO4 laser emitting up to 165 mW of single frequency, TEM00 mode, 532 nm green laser output. This compact, high efficiency, single frequency laser incorporating a novel coupled cavity technology appears promising for use in holographics and the printing industry. This coupled cavity technology provides for a frequency-doubled laser capable of operating in single longitudinal mode while eliminating many intracavity optical components, such as polarizers, waveplates or etalons. The few intracavity elements include a KTP nonlinear optical crystal employed for intracavity frequency doubling. The reduced component count results in a dramatic reduction in optical losses in the laser cavity and increased efficiency. This laser device produces 165 mW of green laser output power from a 1 W pumping laser diode, illustrating that both power and efficiency are improved using this technology. The reduced components also allow for a more compact laser, with the laser head measuring 3 X 3 X 12 cm, and the power control unit measuring 5 X 13 X 15 cm. This laser also features excellent output stability with power variation less than 1% over 4 hours, and less than 0.5% amplitude noise in the 10 Hz to 560 MHz bandwidth range.
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