Frequency and phase noise analysis in the 1550 nm external cavity diode laser with a cat-eye reflector

A 1550 nm narrow linewidth external cavity diode laser with a cat-eye reflector has been demonstrated. Two silicon etalons are used as spectral filters, and a cat-eye reflector is used to suppress the frequency noise. The linewidth and noise characteristics of the laser are evaluated by using the delayed self-heterodyne interferometer. The laser has a Lorentzian linewidth of 5.1kHz at a maximum output power of 45 mW. The noise floor of the laser is 800Hz²/Hzand the phase noise is less than 1μrad/Hz at 1 MHz. The influences of the cat-eye reflector on the laser noise are investigated. The frequency noise caused by environmental vibration has been suppressed nearly 10 times less using the cat-eye reflector.