Mixing After Doubling

The Sirah MAD-195 (mixing after doubling) is designed to generate laser radiation in the UV wavelength range from 190 nm to 202 nm. It is operated together with a Cobra-Stretch or PrecisionScan dye laser, pumped by an injection seeded Nd:YAG laser.

Principles

The dye laser is operated in the blue spectral range, from 462 nm to 490 nm. Its output beam is first frequency doubled by a BBO crystal. Then, the resulting UV beam is sum frequency mixed with the residual fundamental Nd:YAG radiation. A set of 4 dichoic mirrors separates the generated UV beam from  the two incoming beams. Additionally, the MAD-195 unit may easily upgraded to a third harmonic generation unit (THU-205), giving access to wavelength from 197 nm to 212 nm.

Optical Layout

Mixing-After-Doubling-Optical-Layout

Tuning Range

Mixing-After-Doubling-Tuning-Range

Tuning curve with Coumarin 102 dye, when pumped with approximately 400 mJ @ 355 nm

Energy Output

Pump Laser Dye Laser Output Energy
UV energy output at 196 nm. See tuning curves for energies at other wavelengths.
400 mJ @ 355 nm PrecisionScan-G-24 1.5 mJ
400 mJ @ 355 nm PrecisionScan-D-24 1.4 mJ
320 mJ @ 355 nm Cobra-Stretch-G-24 1.2 mJ
320 mJ @ 355 nm Cobra-Stretch-D-24 1.1 mJ

General Characteristics

1) single crystal operation, requires WS-Auto Pellin-Broca unit

2) requires upgrade set consisting of crystals (SHG-260 and SHG-205), halfwave plate, DC-205 dichroics.
Requires 2400 lines/mm grating

3) with secondary main amplifier, only possible with PrecisionScan laser

Wavelength range MAD 190 – 202 nm
Wavelength range SHG 1) 206 – 220 nm (SHG-206 crystal, optional)
  215 – 280 nm (SHG-215 crystal, included)
  250 – 380 nm (SHG-250 crystal, optional)
Wavelength rangeTHU 2) 200 – 210 nm
Maximum Pump Energy 350 mJ @ 355 nm
  550 mJ @ 355 nm 3)
Dye Laser Resonator 2400 lines / mm grating recommended
  1800 lines / mm grating possible
Dye Laser Amplifier Enhanced Beam Profile cell recommended
Repetition Rate 10 Hz recommended
UV Beam Polarization vertical, > 98 %
UV Beam Diameter (typical) 3 – 6 mm, depending on amplifier cell type
UV Beam Divergence < 0.5 mrad

 

Dimensions

Mixing-After-Doubling-Dimensions

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

Literature & Downloads

Datasheet Mixing After Doubling