Gemini-PIV

Nd:YAG Laser Systems

Gemini PIV is a compact, dual laser head system designed to provide a highly stable, pulsed green light source for Particle Image Velocimetry (PIV) applications. It is ideally suited for most liquid and many air-based PIV experiments. Its small size provides excellent flexibility in setting up such experiments.

Two pulsed Nd:YAG infrared laser heads are mounted on a single baseplate. The 1064 nm beams are polarization combined and then enter a second harmonic generator to produce visible (532 nm) light. Dichroic mirrors separate the visible from the residual infrared light and direct the beam to the experiment. The delay between the two pulses may be varied using an external trigger source. This makes it possible to study different systems with variable flow rates.
 

Specifications
 


Gemini PIV 90-30 Gemini PIV 200-15
  Repetition Rate (Hz) 30 15
  Energy1 (mJ)    
  Single Head 532 nm 90 200
355 nm5 30 50
266 nm 15 40
  Energy Stability2 (±%)    
  Single Head 532 nm 5 5
355 nm5 10 7
266 nm 11 8
  Beam Diameter (mm) 4.5 5.5
  Pulse Width3 (ns) 3-5 3-5
  Divergence4 (mrad) <2 <2
  Beam Pointing Stability (urad) <200 <200
  Jitter (±ns) 0.5 0.5
 

1.   Optical losses due to optional attenuator will reduce maximum energy by 10%. Optical
      attenuator is not available for Gemini 200.
2.   Pulse-to-pulse for 98% of shots after 30 minute warm up
3.   Full width half maximum
4.   Full angle for 86% of the energy, at 1/e2 point
5.   For single head operation. Only one laser head may be optimized for 355 nm.

Physical Characteristics
 


Laser Head Power Supply (2 ea) Control Panel (2 ea)
  Length Gemini 90 16.63" / 422 mm 19.0" / 483 mm 6.0" / 152 mm
Gemini 90-ext 19.31"/490 mm same same
Gemini 200 18.63" /473 mm same same
Gemini 200-ext 21.31"/541 mm same same
  Width 10.0" / 254 mm 8.6" / 218 mm 8.1" / 206 mm
  Height 3.88" / 99 mm 15.0" / 381 mm 3.5" / 89 mm
  Weight Gemini 90 26.5 lbs /12 kg 55 lbs / 25 kg 3 lbs / 1.4 kg
Gemini 200 32 lbs/14.5 kg same same
  Umbilical Length 8 ft / 2.4 m   10 ft / 3 m
 


Operating Requirements

 

Temperature

 70° ± 10° F (21° ± 5° C)
  Relative Humidity
 20 – 80% non-condensing
  Voltage
 95-125 V or 200-250 VAC, 50/60 Hz
  Power
 600 Watts x 2 or 1200 Watts total
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