Stabilization of semiconductor lasers by fiber Bragg gratings

Abstract

We present methods of improvement of wavelength stability and tuneability of semiconductor laser diodes in fiber laser interferometers by fiber Bragg gratings (FBGs). We developed simulation method to calculation of arbitrary fiber grating (apodized, chirp etc.) with high precision by combination of methods based on layered dielectric media (LDM) and transfer matrix. On the basis of our simulations and measurements of the commercially available fiber gratings we designed a special 100 mm long fiber Bragg grating with apodization. We expect the application of the FBG to improvement of the linewidth and mode-hop free tuning range of semiconductor lasers at the wavelength 760 nm to increase resolution of fiber laser interferometer based on these diodes. We built the absolute fiber laser interferometer with Vertical Cavity Surface Emitting Laser (VCSEL) to easy employ FBG to stabilize wavelength and control the tuning range. First set up is presented.

Emission characteristics of surface second-order metal grating distributed feedback semiconductor lasers

“…These deficiencies limit the direct applications of high power broad stripe lasers. Several approaches have been used to stabilize the emission wavelength, narrow the spectrum and improve the output beam quality of these pump lasers, all of which were based on establishing spectrally selective feedback, such as the combination of an external collimation lens and a volume Bragg grating (VBG) [2][3][4], external fiber Bragg gratings (FBG) [5][6][7][8][9][10] and distributed feedback gratings integrated into the laser chip (DFB laser) [11][12][13]. However, the requirement for a collimating lens and alignment of the VBG and FBG makes both of these approaches complex and expensive.…”