We have fabricated a second-harmonic-generation device with a new walk-off-compensating structure of β-BaB 2 O 4 (BBO) by room-temperature bonding. The 5-mm-long device, which consists of four 1-mm-thick plates and additional input and output plates of 0.5 mm thickness, generated nearly twice the UV second-harmonic power compared with a bulk BBO crystal. Moreover, we found that the device can improve the beam shape of the output UV light, which is otherwise degraded in a bulk crystal due to the walk-off effect.
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HARA et al. (2012) studied this question.
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