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TOPAG Lasertechnik GmbH
Nieder-Ramstädter Str. 247
64285 Darmstadt
Telefon: +49 6151 4259 78
Telefax: +49 6151 4259 88 
E- mail: info [at] 

PT200 - Serie, abstimmbar

PT200 - Serie, integrierte abstimmbare OPG-Nd:YAG Laser


Die integrierten Systeme der PT200 Serie bestehen aus einem OPO und einem DPSS Pumplaser. Es wird ein Wellenlängenbereich von 690 bis 3400nm, bzw. mit Frequenzverdopplung auch 350 bis 500nm, abgedeckt. Die Repetitionsrate liegt im Megahertz-Bereich, was den Laser besonders für Anwendungen in der nicht-linearen Spektroskopie, für CARS und Mikroskopie attraktiv macht.


Bezeichnungen der Tabs

  • Beschreibung
  • Spezifikationen
  • Bilder
Tab 1


  • 690 – 3400 nm tuning range
  • Optional tuning range extension to UV
  • Nearly Fourier transform-limited linewidth
  • Nearly diffraction limited divergence
  • Up to 5 kW pulse peak power
  • Collinear output of two tunable wavelengths for CARS applications (optional)
  • Output wavelength monitoring (optional)
  • PC control via USB (RS232 is optional) and LabView™ drivers


  • CARS microscopy and spectroscopy
  • Two-photon fluorescence microscopy
  • Second harmonic generation microscopy
  • Laser induced fluorescence microscopy
  • Infrared spectroscopy

PT200 series laser systems integrate a picosecond optical parametric oscillator and a DPSS pump laser into a single compact housing. Mounting the components into one frame provides a cost-effective and robust solution with improved long-term stability and reduced maintenance costs. The MHz pulse repetition rate enables the photon-counting detection method in numerous non‑linear spectroscopy and microscopy applications.

PT257 and PT259 are targeted for CARS and two photon fluorescence applications. The tuning range of PT257 and PT259 supports Raman shift measurements in the 1000 – 4000 cm⁻¹ range. An optional second harmonic generator extends the PT259 tuning range to UV, enabling time‑resolved laser-induced fluorescence measurements.

The PT277 model produces approximately 0.5 W power in mid‑IR range from 2500 nm to 3400 nm with nearly Fourier transform limited linewidth. Applications include infrared spectroscopy and vibrational spectroscopy on surfaces.

All models produce nearly diffraction limited divergence beams with M² measured as <1.3 over the tuning range.

The microprocessor-controlled wavelength tuning is fully automatic. The wavelength controlling elements are mounted on precise micro‑stepping motors. The temperature of the non‑linear crystal is controlled by a precise thermo-controller with a bidirectional Peltier element resulting in the fast tuning of crystal temperature.

The lasers may be controlled from a remote keypad or via USB (RS232 is optional) interface from a personal computer using LabView™ drivers.

PT200 series available models

Model Specifications
PT259 1 MHz pulse repetition rate, > 25 mW power at 800 nm, 7 ps pulse duration.
PT257 87 MHz pulse repetition rate, > 400 mW power at 800 nm, 7 ps pulse duration
PT277 87 MHz pulse repetition rate, nearly Fourier transform limited (<0.3 cm⁻¹) linewidth, 70 ps pulse duration
Tab 2
Specifications 1)

OPO/OPG specifications
Pulse repetition rate 2) 1 MHz 87 MHz 87 MHz
Tuning range
Signal 700-1000 nm3) 690-1000 nm 1550-2020 nm
Idler 1150-2200 nm 2250-3400 nm
SH (optional) 350-500 nm - -
Output power4)
OPO/OPG 5) 25 mW 400 mW 300 mW
SH 6) 1 mW - -
Linewidth 5) < 8 cm-1 < 7 cm-1 < 0.3 cm-1
Typical pulse duration 5) 7) 7 ps < 7 ps 70 ps
Typical time bandwidth product < 0.8
Scanning step
Signal 0.1 nm
Idler 1 nm
SH 0.05 nm - -
Signal beam horizontal
Idler beam horizontal
SH vertical - -
Typical beam diameter 5) 8) 2 mm ~4.5 mm 2 mm
Typical beam divergence5) 9) < 2 mrad
M2 < 2 10) < 2 10) -
Pump laser 11)
Pump wavelength 532 nm 532 nm 1064 nm
Max. pump power12) 0.45 W 3 W 5 W
Pulse repetition rate 1 MHz 87 MHz 87 MHz
Pulse duration13) < 10 ps 80-100 ps
Beam quality Gaussian > 90 % fit
Beam divergence9) < 2 mrad
Physical characteristics
Unit size (WxLxH) 455x1220x260 mm 330x735x175 mm 455x1220x260 mm
Power supply size (WxLxH) 365x395x290 mm 555x525x530 mm
Umbilical length 2 m
Operating requirements
Cooling air
Room temperature 22 ± 2 °C
Relative humidity 20-80 % (noncondensing)
Power requirements 100-240 V AC, single phase 50/60 Hz
Power consumption < 1 kVA

1) Due to continuous improvement, all specifications are subject to change without notice. For latest product information please visit EKSPLA. Parameters marked ‘typical’ are indications of typical performance (not specifications) and will vary with each unit we manufacture. Unless stated otherwise, all specifications are measured at 1064 nm.

2) Inquire for custom pulse repetition rates.

3) Tuning range extension to 620 nm is optional.

4) Output powers are specified at selected wavelengths. See typical tuning curves for power at other wavelengths.

5) Measured at 800 nm for PT25x models, and at 1620 nm for PT277 model.

6) Measured at 400 nm.

7) Pulse duration can vary depending on wavelength and pump energy.

8) Beam diameter at the FWHM level and can vary depending on the pump pulse energy.

9) Full angle measured at the FWHM level.

10) Specified only for signal output.

11) Separate output port for the pump beam is standard. Output ports for other available harmonics are optional.

12) Data represents typical values. Laser output will be optimised for OPO operation and specification may vary with each unit we manufacture.

13) Measured at 1064 nm.

Tab 3

Tab 3 Inhalt

Tab 4

Tab 4 Inhalt

Tab 5
The power is shown only at the wavelengths where ambient air absorption is negliglible.
Bild 1
 PT200 series picosecond tunable laser
Beschreibung 1
PT200 series picosecond tunable laser
Bild 2
 Typical output power of PT257 tunable laser
Beschreibung 2
Typical output power of PT257 tunable laser
Bild 3
 Typical output power of PT259 series picosecond tunable laser
Beschreibung 3
Typical output power of PT259 series picosecond tunable laser 
Bild 4
 Typical output power of PT277 tunable laser
Beschreibung 4
Typical output power of PT277 tunable laser
Bild 5
 E-CARS, F-CARS, P-CARS spectra of a polystyrene bead (1.1 μm in diameter) measured with PT259 laser. The average pump and Stokes powers were 0.26 mW and 0.6 mW, respectively
Beschreibung 5
E-CARS, F-CARS, P-CARS spectra of a polystyrene bead (1.1 μm in diameter) measured with PT259 laser. The average pump and Stokes powers were 0.26 mW and 0.6 mW, respectively
Bild 6
 External dimensions of the PT200 series lasers
Beschreibung 6
External dimensions of the PT200 series lasers
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Located in: Abstimmbar | Pikosekunden