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(Color online) Experimental setup of the dual wavelength microlaser: PLD, pump laser diode; GRIN, gradient index lens; LC, Nd:GdVO4 laser crystal with HR coating at working wavelengths on the pump side; M, output mirror; BS, beam splitter; PD, germanium photodiode; F, variable neutral density filter; and CCD, CCD camera.
(Color online) Measured evolution of the power at each wavelength as a function of the tilt angle of the output mirror for a 4 mm long cavity.
Measured spectrum of the laser output for a tilted position of the ouput mirror.
(Color online) Observed spectrum after the non linear crystal showing SHG and SFG lines. The original laser spectrum is plotted for comparison with a halved wavelength horizontal axis.
(Color online) Measured dependence of the power ratio on the mirror tilt angle for a 4 mm long cavity. The two curves were recorded with different coupling settings between the pump laser diode and the crystal.
(Color online) Measured dependence of the power ratio on the mirror tilt angle for different cavity lengths.
Transverse mode profiles of the laser are presented in the first line for 3 increasing values of the tilt angle α. Below are the corresponding spectrum images as seen at the output of the monochromator showing single or dual wavelength emission.
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