High-power distributed Bragg reflector ridge-waveguide diode laser with very small spectral linewidth.

We manufactured and investigated distributed Bragg reflector ridge-waveguide diode lasers having sixth-order surface gratings and an emission wavelength around 974 nm. The single-mode output power of the lasers with a total length of 4 mm exceeded 1 W. A very small spectral linewidth of 1.4 MHz (3 dB) consisting of a Lorentzian part of 146 kHz and a Gaussian part of 1308 MHz was measured using a self-delayed heterodyne measurement technique.

[1]  U. Zeimer,et al.  Novel passivation process for the mirror facets of Al-free active-region high-power semiconductor diode lasers , 2005, IEEE Photonics Technology Letters.

[2]  A. Schawlow,et al.  Infrared and optical masers , 1958 .

[3]  Pierre Doussiere,et al.  Very high power 1310nm InP single mode distributed feed back laser diode with reduced linewidth , 2007, SPIE OPTO.

[4]  K. Kikuchi,et al.  Novel method for high resolution measurement of laser output spectrum , 1980 .

[5]  H. Ludvigsen,et al.  Laser linewidth measurements using self-homodyne detection with short delay , 1998 .

[6]  G. Erbert,et al.  Fundamental-Lateral Mode Stabilized High-Power Ridge-Waveguide Lasers With a Low Beam Divergence , 2008, IEEE Photonics Technology Letters.

[7]  H. Wenzel,et al.  Calculation of combined lateral and longitudinal spatial hole burning in lambda /4 shifted DFB lasers , 1993 .

[8]  A. Hardy,et al.  Lateral mode discrimination and self-stabilization in ridge waveguide laser diodes , 2006, IEEE Photonics Technology Letters.

[9]  L. B. Mercer,et al.  1/f frequency noise effects on self-heterodyne linewidth measurements , 1990 .

[10]  Andreas Klehr,et al.  980-nm DBR lasers using higher order gratings defined by i-line lithography , 2005 .

[11]  C. Henry.  Theory of the linewidth of semiconductor lasers , 1982 .

[12]  G. Erbert,et al.  High-power 980-nm DFB RW lasers with a narrow vertical far field , 2006, IEEE Photonics Technology Letters.

[13]  B. Tromborg,et al.  Theory of linewidth for multielectrode laser diodes with spatially distributed noise sources , 1991 .