Thermal compensation in GaPO4 beam resonators: experimental evidence for length extensional mode

Temperature effects in gallium orthophosphate (GaPO
₄
) vibrating beams are reported. In addition to the well-known, thickness-shear AT-cut, temperature-compensated cuts exist in GaPO
₄
for length extensional modes. Experimental evidence of a temperature-compensated cut in GaPO
₄
rectangular beam resonator vibrating in length extension is given