![]() We investigated the stability of the CBC operation over time. At a current of 20 mA, the average phase shift was π, so the relationship between the phase and RW current is 20 mA / π (Fig. 3). Phase control was performed by tuning the current through the ridge waveguide section ( I RW) of the one TPA to stabilize the relative phase difference between the amplified beams. This is a significant increase in optical power compared to a common MOPA, which usually achieves a power of 2.4 W (Fig. 2). ![]() With this setup, we achieved a remarkably high combination efficiency of over 80 % and a maximum combined optical power of P CBC = 3.5 W. The phase locking process was automated by using a microcontroller and a reserved climbing hill algorithm. The current through the ridge waveguide (RW) section of the tapered amplifier is used for phase stabilization. FBH has now successfully demonstrated a setup by coherently combining the radiations from two individual TPAs at 808 nm into one single beam. ![]() In this method, two or more amplified laser beams can be coherently combined to produce a single beam with much higher optical power. This allows the power to be increased to a few watts.Ĭoherent beam combining (CBC) is a very useful method that can overcome even this power limitation. The first step in overcoming this limitation is to use a tapered optical amplifier (TPA) and create a master oscillator power amplifier (MOPA). However, single-mode diode lasers have power limitations of a few hundred milliwatts due to the risk of catastrophic optical mirror damage (COMD). Their electro-optical efficiency, robustness and very small dimensions make them perfect candidates for applications with limited space. Diode lasers with high optical power and good beam quality are in high demand for many technological applications, including laser cutting and destruction of diseased cells.
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