A 13C2H2 frequency-stabilized λ/4-shifted DFB laser diode with an external fiber ring cavity having a linewidth of 2.6 kHz and a RIN of −135 dB/Hz

We describe a
¹³
C
₂
H
₂
frequency-stabilized λ/4-shifted DFB-LD with an external fiber ring cavity, which has a linewidth of 2.6 kHz and an RIN of -135 dB/Hz. The frequency stability reached as high as 2.8×10
^-10
.