FM-eliminated C2H2 frequency-stabilized laser diode with an RIN of -135 dB/Hz and a linewidth of 4 kHz.
We demonstrate the frequency stabilization of a 1.5 microm laser diode (LD) with a low-intensity noise and a narrow linewidth to a 13C2H2 linear absorption line. The LD consists of an InP gain chip and an external Bragg reflector made of a PLC waveguide. By employing an external frequency modulator in a frequency stabilization circuit, an FM-eliminated optical output beam was obtained. The frequency stabilities reached as high as 2.3x10(-11) for tau=1 s and 9.1x10(-12) for tau=100 s. Furthermore, an RIN of less than -135 dB/Hz and a linewidth of 4 kHz were simultaneously achieved.
Kasai
Keisuke
K
Research Institute of Electrical Communication, Tohoku University, Sendai, Japan. kasai@riec.tohoku.ac.jp
Nakazawa
Masataka
M