Laser diode linewidth measurement using high-Q spherical microresonators

作者：Pineda Vadillo P^*; Lynch M; Charlton C; Tessarin S; Donegan J F; Weldon V

来源：Electronics Letters, 2011, 47(2): 129-+.

DOI：10.1049/el.2010.2739

A novel technique to measure the emission linewidth of laser diodes (LDs) utilising whispering gallery modes (WGMs) in high-Q microspheres (diameter similar or equal to 200 mu m) is proposed and demonstrated. Laser light from a distributed feedback (DFB) LD operating at lambda similar or equal to 1537.1 nm is coupled into silica glass microspheres of Q similar or equal to 10(7) (estimated experimentally). WGM spectra are recorded and then used to estimate the DFB LD emission linewidth, yielding a value of 3.8 MHz. The estimated value is in good agreement, within experimental error, with a linewidth value of 6.0 MHz independently measured using the self-homodyne technique, strongly supporting the validity of this novel method.

• 出版日期2011-1-20