Development of an optical frequency interval divider centred at 709 nm

The UWA research group is developing a coherent microwave-to-optical frequency chain beginning with a series of frequency interval bisection stages. The first stage requires a transfer oscillator at a wavelength of 709 nm. Two such oscillators have been constructed from broad area laser diodes (BALs) and a beat signal between the two has been generated with a fast linewidth less than 100 kHz.