By investigating the rate equations of Q-switched simultaneous dual-wavelength lasers and by using the polarization-dependent emission cross section of a laser crystal to balance the equivalent emission cross sections of the dual lasing wavelengths, we have developed a new resonator configuration by introducing a quarter-wave polarization rotator. The two wavelengths exhibit an equal net gain in the laser rod, and the optimal spatial and temporal overlap can be achieved easily for optimal sum-frequency mixing. This configuration has a cavity length that is shorter than in previously used configurations, so it is suitable for operation at high output power and with a high repetition rate with a short thermally determined focal length.
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