Cobra-Stretch

PULSED DYE LASERS

  • Wavelength coverage from
    190 nm to >11 µm
  • Spectral linewidths <0.03 cm-1
  • Patented Grating Lift option
  • High output energy, >240 mJ with Quanta-Ray Nd:YAG at
    800 mJ per pulse

Pulsed Dye Lasers

Spectra-Physics’ state-of-the-art pulsed dye laser systems are German engineered by our partner firm Sirah GmbH for precision, stability and reliability. At the heart of the laser system is a grazing incidence resonator designed to utilize the grating’s dispersion twice per oscillator round-trip, ensuring narrow linewidths with low ASE. An optional second grating can be added to the resonator for ultra-narrow linewidths below 0.03 cm-1 at 570 nm. The resonator allows narrow-line tuning over a broad tuning range without the need for an intra-cavity etalon or grating change, thus simplifying the measurement process without sacrificing performance.

The pulsed dye laser family includes options such as grating lift, removable cuvettes, touch screen remote control box, reversible cover, “look-up-table” or auto tracking frequency conversion units, kinematic pump mirror blocks, open source software and CAN bus communications, making these dye lasers the most versatile, technologically advanced lasers on the market.

Cobra-Stretch — Amplified narrow linewidth nanosecond dye lasers

The Cobra-Stretch meets output energy needs up to 250 mJ. Based on a two-stage design, the Cobra-Stretch accommodates an extra amplifier stage to obtain higher powers with either a rectangular cell or capillary amplifiers. An optional autotracking bolt-on frequency conversion unit can be used to extend the range of wavelengths. Other harmonic modules can be used to increase the tuning range even further in to the UV and IR.

Applications

Laser induced fluorescence
LIDAR and remote sensing
Combustion and atmospheric studies
Laser spectroscopy
Cavity ringdown spectroscopy
CARS
Photolysis
 
ModelGroove DensityGrating LengthTuning RangeLinewidthEfficiency  
Cobra-Stretch-P 370–920 nm 150 pm 5 cm-1(5) 30%1  
 
ModelGroove DensityGrating LengthTuning RangeLinewidthEfficiency
With Amplifier
 
Cobra-Stretch-G 1800 lines/mm4 60 mm 400–920 nm 3.6 pm 0.10 cm-1(1) 30%1  
2400 lines/mm4 60 mm 370–760 nm 2.7 pm 0.08 cm-1(2) 30%2  
3000 lines/mm 60 mm 370–620 nm 2.0 pm 0.06 cm-1(2) 30%2  
Cobra-Stretch-LG 1800 lines/mm4 90 mm 400–920 nm 2.4 pm 0.06 cm-1(1) 30%1  
2400 lines/mm4 90 mm 370–760 nm 1.8 pm 0.06 cm-1(2) 30%2  
3000 lines/mm 90 mm 370–620 nm 1.4 pm 0.05 cm-1(2) 30%2  
Cobra-Stretch-D 1800 lines/mm4 2 x 90 mm 410–900 nm 1.7 pm3 0.05 cm-1(1) 27%1  
2400 lines/mm4 2 x 90 mm 370–710 nm 1.2 pm3 0.04 cm-1(2) 27%2  
3000 lines/mm 2 x 90 mm 370–580 nm 1.0 pm3 0.03 cm-1(2) 27%2  
 
Absolute Wavelength Accuracy <15 pm (prism model: 0.5 nm)  
Wavelength Resetability <2 pm (prism model: 0.05 nm)  
Wavelength Stability <1.5 pm/°C (prism model: 10 pm/°C)  
Divergence (typical) 0.5 mrad with main amplifier  
Polarization >98%, vertical  
ASE <0.5%  
Pump Energies (with EBP cell)
with amplifier
50–650 mJ (800 mJ) @ 532 nm
50–400 mJ (500 mJ) @ 355 nm
 
 
Voltage 110–230 V, single phase, 50 Hz/60 Hz  
Computer Single USB  
Operating System Windows 2000 / Windows XP / Windows Vista  

1. At 625 nm (peak DCM) pumped at 532 nm
2. At 570 nm (peak Rhodamine 6G) pumped at 532 nm
3. Exact linewidth depends weakly on wavelength; value given for 450 nm
4. 1800 lines per mm Woods Anomally occurs at 560–571 nm and 2400 lines per mm Woods Anomally occurs at 423–434 nm
5. For wavelengths <660 nm

Pulsed Dye Laser Optical Layout

Pulsed Dye Laser Dimensions

 AB  
Cobra-Stretch 770 710

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Supporting Products

Product Description
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Quanta-Ray Lab
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