In this paper a novel scheme for optical manipulation of objects utilizing the frequency difference of two separate
lasers is proposed. In this scheme interference fringes moving at constant speed generated from two counter-propagating
laser beams are expected to transport small particles trapped. For this purpose a highly stable light source is needed. On
the other hand, actuators are nowadays widely used for controlling the position of or moving an object. Among them,
piezoelectric actuators are commonly utilized to accurately control the angle of a diffraction grating in an external cavity
laser diode (ECLD). However, conventional use of piezoelectric actuators in ECLDs causes difficulty in continuous
scanning of the wavelength of an ECLD. Here, the 'tandem ECLD' utilizing an electromagnetically-driven actuator
instead of a piezoelectric actuator is proposed based on the theoretical calculation that, when two separate lasers with
different wavelengths sharing a common perturbation term are combined, the wavelength of the combined laser can be
controlled in terms of the frequency difference of the two lasers. The wavelength shift of a prototype of the 'tandem
ECLD' with respect to the current applied to the electromagnetically-driven actuator is measured. It is shown that the
wavelength tuning method of an laser diode (LD) using an electromagnetically-driven actuator at low voltage exhibits
equivalent performance (2.51nm wavelength shift when 2.58mA applied) to the conventional method that causes
wavelength tunability using a piezoelectric actuator.
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