AOM double pass configuration to modulate the laser frequency. PBS: polarization beam splitter, QWP: quarter wave plate, and BB: beam block.
Transmission efficiency after the fiber of the double pass AOM configuration as a function of the driver frequency. Efficiency with compensating circuit of Fig. 3 (black line) and without it (gray line).
Amplitude compensation circuit. V FM is the input from the frequency modulation and V AM is the output to the amplitude modulation. The potentiometers that control the parameters a, b, c, V 2, and V 4 are indicated. The output has a protection voltage clamp between 0 and 1 V. The switch changes the sign of the quartic term.
Amplifier section with second AOM for intensity modulation and additional beams. OI: optical isolator, HWP: half wave plate, CL: cylindrical lens, TA: tapered amplifier, and BB: beam block.
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