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Frequency stabilization of multimode diode lasers with fiber Bragg gratings

: Klein, Sarah; Giesberts, Martin; Traub, Martin; Fitzau, Oliver; Hoffmann, Dieter


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Photonics Society, Scottish Chapter:
IEEE High Power Diode Lasers and Systems Conference, HPD 2019. Proceedings : Co-located with Photonex 2019, Coventry, United Kingdom, 9th and 10th October 2019
Piscataway, NJ: IEEE, 2019
ISBN: 978-1-7281-3097-2
ISBN: 978-1-7281-3098-9
High Power Diode Lasers and Systems Conference (HPD) <2019, Coventry>
Photonex Event <2019, Coventry>
Fraunhofer ILT ()
High Power Diode Lasers; spectral stabilization

We present the frequency stabilization of a multimode diode laser single emitter at 1074.8 nm by use of fiber Bragg gratings in a 105/125 μm NA 0.22 fiber that is spliced to the output fiber of the diode laser. At 25°C, the spectral full width at half maximum decreases from 4.6 nm in the free-running configuration to 1.1 nm using an FBG with a reflectivity of R=0.07, the thermal drift decreases from 2.12 nm/W to 0.45 nm/W. The optical output power at 10 A with frequency stabilization is 6.6 W compared to 6.7 W without FBG, hence the loss amounts to less than 3%. We compare the results for two different FBG-reflectivities and operate the diode laser at 25°C and 30°C. The FBGs are directly written into the multimode fibers with an ultra-fast laser (100 fs, 800 nm) and the phase mask technique.