Infra-Red Generation


A frequency doubled, injection seeded Nd:YAG laser is used to pump the dye laser, operated in the red spectral region. The dye laser output beam and the residual 1064 nm pulse from the Nd:YAG are mixed in a temperature stabilized LiNbO3 crystal for difference frequency generation. A set of dichroic mirrors separates the generated IR pulse from the two incoming beams. Due to injection seeding, the resulting bandwidth is governed by the configuration of the dye laser resonator.

Optical Layout


Tuning Range


Tuning curves for mixing with approximately 500 mJ @ 532 nm; gap characteristics shown for DFM-3800-T

Energy Output

Pump Laser Dye Laser Output Energy
IR energy output at 2 µm (maximum Pyridine 1). See tuning curves for output energies at other wavelengths. Values for injection seeded pump lasers.
500 mJ @ 532 nm Cobra-Stretch LG-18 6.0 mJ
500 mJ @ 532 nm Cobra-Stretch-D-18 5.7 mJ
430 mJ @ 532 nm Cobra-Stretch LG-18 5.1 mJ
430 mJ @ 532 nm Cobra-Stretch-D-18 4.8 mJ
380 mJ @ 532 nm Cobra-Stretch LG-18 4.6 mJ
380 mJ @ 532 nm Cobra-Stretch-D-18 4.4 mJ


General Characteristics

Maximum Pump Energy 500 mJ 532 nm,
Seeder for Nd:YAG Laser Imperative
Dye Laser Amplifier Necessary, Enhanced Beam Profile Cell recommended
Crystal Tuning Mode Look-Up Table
IR Beam Polarization Vertical, > 98%
IR Beam Diameter (typical) 3 – 6 mm, depending on amplifier cell type
IR Beam Divergence < 0.5 mrad
IR Linewith < 1.1 x Dye Laser Linewith
Tuning Range DFM-2400-T 1.5 – 2.4 µm
  DFM-2870-T 1.8 – 4.2 µm gap at 2830 nm
  DFM-3800-T 1.8 – 4.2 µm gap at 2870 nm
  DFM-5200-T 4 – 5.2 µm


All Dimensions in mm. Specifications are subject to change without notice.

Literature & Downloads

Datasheet Infra-Red Generation