High-power linearly-polarized single-frequency thulium-doped fiber Master-Oscillator Power-Amplifier.
We report a high power narrow-linewidth source at approximately 2 microm based on a Tm-doped fiber distributed-feedback master-oscillator and three Tm fiber amplifier stages. The master-oscillator and first two amplifier stages were in-band pumped by Er,Yb fiber lasers operating at 1565 nm, and the final stage amplifier was cladding-pumped at 795 nm by two spatially-combined diode-stacks. The MOPA yielded 100 W of single frequency output at 1943 nm with a beam propagation factor (M(2)) of 1.25 and with a polarization extinction ratio of >94%. The output power was limited by thermally-induced damage in the final amplifier stage. The prospects for further power scaling are considered.
Pearson
L
L
Optoelectronics Research Centre, University of Southampton, Southampton, UK.
Kim
J W
JW
Zhang
Z
Z
Ibsen
M
M
Sahu
J K
JK
Clarkson
W A
WA
D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D016014:Linear Models; D055096:Optical Devices; D009991:Oscillometry / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D013932:Thulium / Q000737:chemistry*
D013932:Thulium