Mode Lockers (AOML)
The G&H’s acousto-optic standing wave mode lockers can obtain near theoretical mode locked laser pulse widths. The exceptional performance is due to the design and manufacture of the high Q acoustic resonator with very low spurious modes. The mode lockers can be used for the Nd:YAG, Nd:YLF, Ti:Sapphire and Argon Ion lasers.
All G&H's mode lockers are designed to the frequency that matches the customer's laser cavity length. It is necessary to adjust the lasercavity mode spacing frequency (length) to be equal to twice the acoustic frequency to achieve mode locking.
Our acousto-optic mode lockers are manufactured from high quality fused quartz with durable hard AR coatings. Brewster window models and other materials are available. The design permits the most efficient coupling of RF energy into acoustic energy.
A laser is mode locked when the longitudinal cavity modes of the laser are forced to maintain a fixed phase relationship with each other. This occurs by modulating the cavity losses at a frequency equal to the frequency difference between adjacent longitudinal modes. These modes are separated by a frequency Δf=c/2l where c denotes the speed of light and l the cavity length. This quantity Δf is also known as resonant mode spacing. The standard models listed below have been designed for 1064nm in fused quartz (silica). Custom designs for other wavelengths are also available.