Tunable Frequency Conversion Units

Tunable Frequency Conversion Units Sirah Lasertechnik
 
  • SW11697
193-16000 nm; Output Energy 0.063-39.0 mJ; Repetition Rate 10-50 Hz; Beam Diameter 3-9 mm;... more
Product information "Tunable Frequency Conversion Units"

193-16000 nm; Output Energy 0.063-39.0 mJ; Repetition Rate 10-50 Hz; Beam Diameter 3-9 mm; Divergence <0.5 mrad; Pump Laser Energy 375-1,400 mJ

Sirah Lasertechnik designs and manufactures a range of tunable frequency conversions for extending the wavelength tuning range of tunable pulsed lasers from the deep UV to the deep IR. These nanosecond-pulsed, multi mode units provide 1 Hz to 100 Hz repetition rates and are based on a modular system and can be easily converted between the optical set-ups.

Within this product range, Sirah Lasertechnik provides tunable frequency conversion units to extend the wavelength region into the UV-VIS region, delivering wavelengths from 193 nm to 440 nm. These UV/VIS wavelength generation systems are available in five versions:

  • The SHG (Second Harmonic Generation) Frequency Conversion Unit (FCU) is designed to frequency double a dye laser beam. Typically, the dye laser is operated in the visible (VIS) spectral range. This frequency is doubled by a BBO crystal followed by a compensator. The crystal’s angle is tuned to maintain phase matching inside of the crystal. An arrangement of two or four Pellin-Broca prisms separates the UV from the fundamental beam. All crystals, compensators and Pellin-Broca prisms are fully adjustable, making the unit easy to use.
  • Sirah Lasertechnik’s THG (Third Harmonic Generation) FCU is designed to generate laser radiation in the 197 nm to 260 nm UV wavelength range. It is operated together with a Nd:YAG pumped dye laser, either a PrecisionScan or a Cobra-Stretch model, lasing in the red spectral range (591 nm to 780 nm). Its output beam is first frequency doubled by a temperature-stabilized BBO crystal. Then, a a second BBO crystal sum frequency mixes the resulting UV beam with the residual dye laser beam. A set of four dichroic mirrors or four Pellin-Broca prisms separates the generated UV beam from the two incoming beams.
  • Sirah Lasertechnik’s MAD - Mixing After Doubling unit is designed to generate laser radiation in the 190 nm to 202 nm UV wavelength range. It is operated together with a Cobra-Stretch or PrecisionScan dye laser, pumped by an injection seeded Nd:YAG laser and lasing in the blue spectral range (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 four dichroic mirrors separates the generated UV beam from the two incoming beams.
  • The SFM - 355 nm and SFM - 1064 nm mixing units are designed to generate laser radiation in the UV wavelength range from 216 nm to 241 nm (SFM - 355 nm) or 360 nm to 440 nm respectively (SFM - 1064 nm). They are operated together with a Cobra-Stretch or PrecisionScan dye laser, pumped by an injection seeded, frequency doubled Nd:YAG laser and lasing in the red spectral range (545 nm to 751 nm, 780 nm for SFM - 1064 nm). Its output beam is sum frequency mixed with either the frequency tripled Nd:YAG radiation (SFM – 355 nm) or the residual fundamental Nd:YAG radiation (SFM - 1064 nm). A pair of (SFM – 355 nm) or a set of four (SFM - 1064 nm) Pellin-Broca prisms separate the generated UV beam from the dye and Nd:YAG beams.


In addition to that, Sirah Lasertechnik provides tunable frequency conversion units to extend the wavelength region into the IR-MIR region, delivering wavelengths from 1100 nm to 16 µm. These IR/MIR wavelength generation systems are available in four versions:

  • The Raman Shift Cell is designed to convert visible or deep-red pulses generated by a dye laser to the near infrared (900 nm to 1500 nm) wavelength range. Wavelength conversion is achieved by the Raman effect, i. e. Stokes-shift in a gas cell filled with either nitrogen or hydrogen under high pressure, where multiple orders of Stokes and Anti-Stokes beams are generated simultaneously. After the cell’s exit window is another, adjustable lens to collimate the emerging beams. Two Pellin-Broca prisms separate the collinear shifted and fundamental beams.
  • For the DFMNIR infrared generation unit, 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.
  • Sirah Lasertechnik’s OPANIR infrared amplification unit and MIR mid infrared generation unit (designed to generate powerful laser pulses in the wavelength range from 4.8 µm to 11 µm ) both use a frequency doubled, injection seeded Nd:YAG laser to pump a PrecisionScan dye laser, operated in the red spectral range (for MIR equipped with either a single or a double grating resonator with 1800 lines/mm gratings, plus an OPANIR optical parametrical amplifier unit). The dye laser output beam and a fraction of the residual 1064 nm pulse from the Nd:YAG are mixed in a temperature-stabilized LiNbO3 crystal for difference frequency generation. The general IR beam pulse passes a second LiNbO3 crystal, pumped by the remaining residual 1064 nm pulse, and tuned to act as an optical parametrical amplifier. The OPANIR amplifies the initial IR beam, and generates signal and idler frequency. For MIR, the difference frequency of these two pulses is generated in a AgGaSe2 crystal.

Key Features:

  • Nanosecond Pulsed
  • Multi Mode
  • Laser Tuning Range: 193 nm to 16 µm
  • Repetition Rate: 1 - 100 Hz
  SHG THG MAD - Mixing After Doubling SFM - 355 nm SFM - 1064 nm
Tuning Range ~206 - 450 nm 190 - 450 nm 190 - 380 nm 214.6 -241 nm 360 - 450 nm
Pump Laser Energy 375, 650 mJ 650 - 1,400 mJ Max. 320, 400 mJ 670 - 1,250 mJ 425 - 850 mJ
Output Energy 6.56 - 39.0 mJ 1% of Pump Laser Energy 1.1 - 1.5 mJ 10 - 32 mJ 18 - 38 mJ
Repetition Rate 10 - 50 Hz Recommended 10 Hz Recommended
Crystal Tuning Mode Look-up Table (Autotracking Optional) - Look-up Table (Autotracking Optional)
Beam Polarization Horizontal, >98% Vertical, >98% Horizontal, >98%
Beam Diameter 3 - 6 mm (Typical) , Depending on Amplifier Cell Type
Beam Divergence <0.5 mrad
Linewidth <1.5 x Dye Laser Linewidth Approx. √3 x Dye Laser Linewidth - - <1.1 x Dye Laser Linewidth
Dimensions 253 x 373 x 210-235 mm 465 x 833 x 207-240 mm 465 x 477 x 207-240 mm

 

  DFMNIR OPANIR MIR
Tuning Range 1.5 - 5.2 µm 1.4 - 4.2 µm 4.8 - 8.0 µm
Pump Laser Energy 380 - 550 mJ
Output Energy 4.4 - 6.0 mJ 24 - 28 mJ 63 - 100 µJ
Repetition Rate - - 10 Hz Recommended
Crystal Tuning Mode Look-up Table
Beam Polarization Vertical, >98% Horizontal, >98%
Beam Diameter 3 - 6 mm, Depending on Amplifier Cell Type 5 - 9 mm, Depending on Laser Configuration
Beam Divergence <0.5 mrad
Linewidth <1.1 x Dye Laser Linewidth <1.5 x Dye Laser Linewidth
Required Equipment  
Injection Seeded ND:YAG Laser - - X
PrecisionScan Dye Laser - - X
OPANIR Near-infrared Unit - - X
Seeder for ND:YAG Laser Imperative
Dye Laser Resonator - - 1800 Lines / Grating Recommended, 1800 Lines / Double Grating Resonator Possible
Dye Laser Amplifier Necessary, Enhanced Beam Profile Cell Recommended Enhanced Beam Profile Enhanced Beam Profile Cell Recommended
Dimensions 465 x 833 x 207-240 mm

 

 Applications: Atomic and Molecular Spectroscopy

Product Group: Tunable Frequency Conversion Units
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