crystal fibers Rod fibers

The DC-200/70-PM-Yb-ROD represents the pinnacle of active double-clad fibers. The rod/fiber is polariza-tion-maintaining and has an effective area above 2000 μm2. The very large effective area combined with extremely high pump-absorption of up to 30dB/m pushes the nonlinear thresholds to a new regime in fiber optics. The rod is aimed at high peak-power pulsed amplifiers and has been shown to handle mega-Watt peak-power levels. The DC-200/70-PM-Yb-ROD is a rod-type fiber with an outer diameter of 1.7 mm – bridging the DPSS and fi-ber laser world. The large outer diameter ensures that the extremely large core will not suffer from bending loss. Moreover, the rod is coating free to facilitate thermal management in high-power setups.

Signal core

Single mode: Yes
Mode field diameter:
55 ± 5 μm Mode field area: 2200 ± 200 m2
NA @ 1060 nm:
~ 0.02
Multimode pump core

Numerical aperture @ 950 nm: 0.6 ± 0.05
Pump absorption @ 920 nm:
~ 10 dB/m Pump absorption @ 976 nm: ~ 30 dB/m Slope effiency: ~60%
Polarization Parameters

Birefringence n: > 1·10-4
Polarization Extinction Ratio:
> 15-25 dB*
* Depending on system configuration
PHYSICAL PROPERTIES

Core material: Yb-doped silica
Outer cladding diameter:
1.7 ± 0.1 mm Coating None
Signal core diameter:
70 ± 5 μm Pump-cladding diameter: 200 ± 5 μm
Pump-cladding shape:
Circular
END CAP OPTION

Material: Pure silica
Length/diameter:
8 mm / 8.2 mm AR coating, R @ 1040-1080 nm: < 0.1 %
AR coating, R @ 976 nm:
< 0.5 % Spot size at facet (1/e2) > 140 μm
Signal return loss
< -35 dB NA supported > 0.6

ADVANTAGES
- Polarization maintaining
- Extreme mode field diameter
- Single mode
- High pump absorption
APPLICATIONS
- Ultra high-power PM amplifiers
- Ultra high-power polarized lasers
- Ultra high-power Q-switched lasers
The fiber is moderately polarizing with a DOP of 80-90% depending on the configuration. The fiber should be operated in the slow-axis.