Basis of the tunable femtosecond mid-IR laser from femtum is a post-amplified, mode-locked laser at 2800 nm with < 500 fs. Its output beam is coupled into a special shifter fiber.
A soliton wave is created there, which is initially amplified and whose wavelength shifts further towards IR with the length of the shifter fiber and depending on the diode current of the fiber pump light.
The user sets the wavelength in the range of 2800 – 3400 nm via the diode current.
Work is done in quais cw mode at 35 MHz, single pulse energies of up to 30 nJ are achieved with a bandwidth of 10 - 75 nm.