Is the minimum frequency resolution different than 10 MHz when using a computer?
If a computer is used to control the fine-frequency tuning of the laser, then the resolution will be approximately 100 MHz or less. The reason for this is that when using a computer, the minimum step size of the piezo voltage is 0.1 volts. A 0.1-volt voltage change on the piezo corresponds to a frequency shift of approximately 100 MHz. The Velocity, Vortex, and Stablewave lasers have a minimum frequency resolution of 10 MHz (or, 2×10-5 nm). However, the only way to access this minimum frequency resolution is by using the Frequency Modulation input on the back panel of the laser controller. The Frequency Modulation input is an analog voltage input that is used to control the piezo voltage. So, if you want to perform a wavelength scan with a frequency resolution of 10 MHz, then you will need to supply a low-noise analog voltage signal to the Frequency Modulation input. Alternately, if you want to scan the laser wavelength in 0.001 nm steps (or, approximately 300 MHz frequency steps), the
