The UHG Series for Mai Tai and Tsunami has been designed to handle greater than 4 W of average power and deliver efficiencies exceeding 40% for SHG (second harmonic), 10% for THG (third harmonic), and 4% for FHG (fourth harmonic). The pulse selector option inside the UHG head offers a SiO2 Bragg cell for the highest output powers and contrast ratio. The system is capable of pulse selecting from single shot to 8 MHz and is positioned before all harmonic stages to offer the most features in a single compact housing. The UHG series is a flexible system suitable for a variety of scientific applications requiring access to a wide spectrum of femtosecond or picosecond laser pulses.