Yb,Er:glass rod for optical fiber fabrication on the way to Europe

High concentration DIGCO® Yb,Er:Glass cylindrical rod with  diameter 3mm and length 120mm as core for optical fiber fabrication  is now on the way to a laboratory for eletro-optics and sensor systems from an University in Europe.

Thanks to the high spatial and spectral quality of their output beam, fiber lasers appear as a promising infrared light source for LIDAR systems. As fiber laser material, phosphate glasses allow to incorporate high levels of rare-earth ions, which enables the manufacturing of short optical fiber devices with a high output power. These features redound into compact, portable lasers that can reach longer distances when compared with other emitting devices. Usually, a one-piece fiber laser having all these characteristics cannot be easily conceived. A convenient way to achieve all the specifications at once is to proceed through a master oscillator power amplifier (MOPA) architecture. In this configuration, the output of a low-power seed laser having the required spectral characteristics is carried into a high-power fiber amplifier. This, in turn, provides the required amplification level without impairing on the other desired specification. A fiber amplifier based on Yb3+-Er3+ codoped phosphate glasses was fabricated and characterized  for an experimental study. At the highest input signal (+5 dBm) the amplifier provided 6.39 dB and 8.52 dB internal gain for medium and highly saturated operation (166.8 mW and 479.8 mW pump power, resp.). The internal gain per unit length was thus 2.37 dB/cm and 3.15 dB/cm, which is higher than or near to values reported as 0.94 dB/cm and 3.3 dB/cm. In addition, the maximum observed internal gain was 10.71 dB, obtained with the minimum input signal (−30dBm) and a 479 mW pump power. This leads to an internal gain of 4.0 dB/cm, a value that is comparable to the values reported as 4.2 dB/cm and 5.2 dB/cm.