PGx01 series


Travelling Wave Optical Parametric Generators (TWOPG) are an excellent choice for researchers who need an ultra‑fast tunable coherent light source from UV to mid IR.




The units can be divided into several functional modules:

  • optical parametric generator (OPG);
  • diffraction grating based linewidth narrowing system (LNS);
  • optical parametric amplifier (OPA);
  • electronic control unit.

The purpose of the OPG module is to generate parametric superfluores-cence (PS). Spectral properties of the PS are determined by the properties of a nonlinear crystal and usually vary with the generated wavelength.

In order to produce narrowband radiation, the output from OPG is narrowed by LNS down to 6 cm⁻¹ and then used to seed OPA.

Output wavelength tuning is achieved by changing the angle of the nonlinear crystal(s) and grating. To ensure exceptional wavelength reproducibility, computerized control unit driven precise stepper motors rotate the nonlinear crystals and diffraction grating. Nonlinear crystal temperature stabilization ensures long‑term stability of the output radiation wavelength.

In order to protect nonlinear crystals from damage, the pump pulse energy is monitored by built-in photodetectors, and the control unit produces an alert signal when pump pulse energy exceeds the preset value.

For customer convenience the system can be controlled through its USB type PC interface (RS232 is optional) with LabView™ drivers or a user-friendly remote control pad. Both options allow easy control of system settings.


  • Ultra-wide spectral range from 193 to 16000 nm
  • High peak power (>50 MW) ideal for non-linear spectroscopy applications
  • Narrow linewidth <6 cm⁻¹
  • Motorized hands-free tuning in 193 – 2300 nm or 420 – 10000 nm range
  • Remote control via keypad
  • PC control via USB port (RS232 is optional) and LabVIEW™ drivers

Related Applications

  • Nonlinear spectroscopy: vibrational-SFG, surface-SH, CARS, Z-scan
  • Pump-probe experiments
  • Laser-induced fluorescence (LIF)
  • Other laser spectroscopy applications

OPA 1)
Tuning range
    Signal 420-680 nm 410-709 nm 680-1063 nm 1395-2100 nm
    Idler 740-2300 nm 710-2300 nm 1065-2300 nm 2200-4500 nm
Output pulse energy 2) > 1000 µJ at 450 nm > 1000 µJ at 450 nm > 1000 µJ at 800 nm > 600 µJ at 1550 nm
> 300 µJ at 3700 nm
Linewidth < 6 cm-1 < 18 cm-1 < 6 cm-1 < 6 cm-1
Max pulse repetition rate 50 Hz
Scanning step
    Signal 0.1 nm
    Idler 1 nm
Typical beam size 3) ~4 mm
Beam divergence 4) < 2 mrad < 2 mrad < 2 mrad < 4 mrad
Beam polarization
    Signal horizontal horizontal vertical horizontal
    Idler horizontal
Pump laser requirements
Pump energy 10 mJ at 355 nm 8 mJ at 355 nm 10 mJ at 532 nm 15 mJ at 1064 nm
Recommended pump source 5) PL2251A-TH 
Beam divergence < 0.5 mrad
Beam profile homogeneous, without hot spots, Gaussian fit >90 %
Pulse duration 6) 30±3 ps
Physical characteristics
Size (W x L x H) 450 x 582 x 270 mm
Operating requirements
Room temperature 15-30 °C
Power requirements 100-240 V AC single phase, 47-63 Hz
Power consumption < 100 W

1) Due to continuous improvement, all specifications are subject to change without notice. Parameters marked typical are not specifications. They are indications of typical performance and will vary with each unit we manufacture. Unless stated otherwise, all specifications are measured at 450 nm for PG401 units, 800 nm for PG501 units and 1550 nm for PG701 units. 2) See tuning curves for typical pulse energies at other wavelengths. Higher energies are available, please contact Ekspla for more details. 3) Beam diameter is measured at the 1/e² point. 4) Full angle measured at the FWHM point. 5) If a pump laser other than the PL2250 series is used, measured beam profile data should be presented when ordering. 6) Should be specified if non-EKSPLA pump laser is used.