High Energy Broadly Tunable OPA
FEATURES
▶ 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 (for UV <9 cm-1)
▶ Motorized hands-free tuning in 193– 2 300 nm or 2 300– 16000 nm range
▶ PC control via USB port (RS232 is optional) and LabVIEW™ drivers
▶ Remote control via keypadAPPLICATIONS
▶ Nonlinear spectroscopy: vibrational-SFG, surface-SH, Z-scan
▶ Pump-probe experiments
▶ Laser-induced fluorescence (LIF)
▶ Other laser spectroscopy applications
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.
Design
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 superfluorescence (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⁻¹and 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 remote control pad. Both options allow easy control of system settings.
Available models
Model Features
PG401
Model has a tuning range from 420 to 2300 nm and is optimized for providing highest pulse energy in the visible part of the spectrum.
The wide tuning range makes PG401 units suitable for many spectroscopy application.
PG501-DFG
Model has a tuning range from 2300 to 16000 nm. The PG501-DFG1 model is the optimal choice for vibrational‑SFG spectroscopy setups.
SPECIFICATIONS 1)
Model
PG401 PG401-SH PG401-DUV PG501-DFG1 PG501-DFG2 Tuning range
DUV
193 – 209.95 nm
SH
210 – 340, 370 – 419 nm
Signal
420 – 680 nm
Idler
740 – 2300 nm
DFG
2300 – 10000 nm
2300 – 16000 nm
Output pulse energy 2)
> 1000 µJ at450 nm
> 100 µJ
> 50 µJ at200 nm
> 250 µJ at 3700 nm,
> 50 µJ at 10000 nm
> 250 µJ at 3700 nm,
> 90 µJ at 10000 nm
Linewidth
< 6 cm-1
< 9 cm-1
< 9 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
~3 mm
~9 mm
Beam divergence 4)
< 2 mrad
< 3 mrad
Beam polarization
horizontal
vertical
horizontal
Signal
horizontal
Idler
horizontal
Typical pulse duration
~15 ps
~12 ps
~12 ps
~20 ps
~20 ps
PUMP LASER REQUIREMENTS
Pump energy
at 355 nm
10 mJ
10 mJ
at 532 nm
10 mJ at 1064 nm
2 mJ
6 mJ
15 mJ Recommended pump source 5)
PL2231-50-TH, PL2251A-TH
PL2231-50-SH PL2231A-50-SH Recommended harmonic generator module
–
SFGH500 Beam divergence
< 0.5 mrad
Beam profile
homogeneous, without hot spots, Gaussian fit >90 %
Pulse duration 6)
30 ± 5 ps
PHYSICAL CHARACTERISTICS
Size (W x L x H)
456 × 633 ×244 mm
456 × 1031 × 249 ± 3 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, 3000 nm for PG501 units and 300 nm for PG401SH units and for basic system without options.
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 level.
4) Full angle measured at the FWHM point.
5) If a pump laser other than PL2250 or PL2230 is used, measured beam profile data should be presented when ordering.
6) Should be specified if non-EKSPLA pump laser is used.
PG401-DFG1 provides:
▶ The broadest hands-free tuning range – from 420 to 10000 nm
▶ It can be further extended up to 16000 nm with -DFG2 option. It should be noted, that for the 8000 – 16000 nm range a different nonlinear crystal is used, and exchange of the crystals needs to be done manually
PG402 features:
▶ Gap-free tuning range 410 – 709, 710 – 2300 nm
▶ Linewidth < 18 cm-1
TUNING CURVES