PGx01 Series - Tunable Narrow Bandwidth OPG Systems

The design of PGx11 series OPG´s is based on a synchronously pumped OPO (SOPO) followed by an OPA. Thus, these lasers provide nearly Fourier transformed limited line width (< 2 cm-1) and high pulse energies at 50 Hz repetition rate. The useful tuning range reaches from deep UV (193 nm) up to mid infrared (16 µm). These lasers are an excellent choice for many spectroscopic applications.

  • Description
  • Specifications
  • Pictures
  • Applications
  • Documents
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Features

  • 2 cm-1 or 0.8 cm-1 linewidth
  • High brightness picosecond pulses at 50 Hz or at up to 1 kHz pulse repetition rate
  • Nearly Fourier-transform limited linewidth
  • Low divergence <2 mrad
  • Hands-free wavelength tuning
  • Tuning range from 193 nm to 16000 nm
  • PC control using USB (RS232 is optional) and LabVIEW™ drivers
  • Remote control via keypad

Applications

  • Time resolved pump-probe spectroscopy
  • Laser-induced fluorescence
  • Infrared spectroscopy
  • Nonlinear spectroscopy: vibrational-SFG, surface-SH, Z-scan, pump probe
  • Other laser spectroscopy applications

PGx11 series optical parametric devices employ advanced design concepts in order to produce broadly tunable picosecond pulses with nearly Fourier-transform limited linewidth and low divergence. High brightness output beam makes the PGx11 series units an excellent choice for advanced spectroscopy applications.

Optical layout of PGx11 units consists of Synchronously pumped Optical Parametric Oscillator (SOPO) and Optical Parametric Amplifier (OPA). SOPO is pumped by a train of pulses at approx. 87 MHz pulse repetition rate. The output from SOPO consists of a train of pulses with excellent spatial and spectral characteristics, determined by the SOPO cavity parameters.

OPA is pumped by a single pulse temporally overlapped with SOPO output. After amplification at SOPO resonating wavelength, the PGx11 output represents a high intensity single pulse on top of a low-intensity train, while in all other spectral ranges (idler for PG411 and PG711, signal for PG511, also DFG stages) only a single high intensity pulse is present.

Three models designed for pumping by up to the 3rd harmonic of Nd:YAG laser are available.

Microprocessor based control system provides automatic positioning of relevant components, allowing hands free operation. Nonlinear crystals, diffraction grating and filters are rotated by ultra-precise stepper motors in microstepping mode, with excellent reproducibility.

Precise nonlinear crystal temperature stabilization ensures long-term stability of generated wavelength and output power.

For customer convenience the system can be controlled through its USB type PC interface (RS232 is optional) with LabView™ drivers or a remote control pad. Both options allow easy control of system settings. Available standard models are summarized in a table below. Please inquire for custom-built versions.

Model Features
PG411 Model has a tuning range from 410 to 2300 nm and is optimized for providing highest pulse energy in the visible part of the spectrum. When combined with an optional Second Harmonic Generator (SHG) and Sum Frequency Generator (-DUV), it offers the widest possible tuning range – from 193 to 2300 nm.
PG511 Model has a tuning range from 2300 to 10000 nm. PG411 and PG511 models are designed to be pumped by PL2230 series lasers with a 50 Hz pulse repetition rate.
PG711 Model has 1 kHz pulse repetition rate and uses DPSS mode‑locked laser of the PL2210 series for pumping. When pumped with pulses of 90 ps duration, linewidths of less than 1 cm⁻¹ were measured in the spectral range up to 16 µm, which makes this device an excellent choice for time-resolved or nonlinear infrared spectroscopy.
Model 1) PG411 PG411-SH PG411-SH-DUV PG511-DFG PG711 PG711-DFG
Wavelength range
    SH, DUV - 210 - 410 nm 193 - 410 nm -
    Signal 410 – 709 nm - 1550 - 2020 nm
    Idler 710 – 2300 nm - 2250 - 3350 nm
    DFG - 2300 – 10000 nm - 3350 - 16000 nm
    DFG2 (up to 16000 nm) - inquire -
Pulse energy 2)
    SH, DUV 3) - 150 µJ 100 µJ -
    Signal 700 µJ - 300 µJ
    Idler 4) 250 µJ - 100 µJ
    DFG -
> 200 µJ at 3700 nm
> 50 µ at 10000 nm
- 10 µJ 5)
Pulse duration 6) 15 ps 20 ps 70 ps
Repetition rate 50 Hz 1000 Hz
Linewidth < 2 cm-1 7) < 2 cm-1 < 0.8 cm-1 < 1 cm-1

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 PG411 units, 800 nm for PG511 units, and 1620 nm for PG711 units and for basic system without options.

2) Pulse energies are specified at selected wavelengths. See typical tuning curves for pulse energies at other wavelengths.

3) Measured at 280 nm for SH and 200 nm for DUV.

4) Measured at 1000 nm for PG411 units, 1620 nm for PG511, and 3000 nm for PG711 units.

5) Measured at 10000 nm.

6) Estimated FWHM assuming pump pulse duration 30 ps at 1064 nm for PG411 and PG511 units, and 90 ps at 1064 nm for PG711 units.

7) <2 cm-1 in signal (420 – 709 nm ) and <4 cm-1 in idler (710 – 2300 nm).

Chen, L. et al. (2018) Ultra-sensitive mid-infrared emission spectrometer with sub-ns temporal resolution. Optics Express, Vol. 26, No. 12, p.  14859 - 14868

Group: Prof. D. Schwarzer, University of Göttingen

Lasers: PL2231-50, APL2100, PG511

Abstract

We evaluate the performance of a mid-infrared emission spectrometer operating at wavelengths between 1.5 and 6 µm based on an amorphous tungsten silicide (a-WSi) superconducting nanowire single-photon detector (SNSPD). We performed laser induced fluorescence spectroscopy of surface adsorbates with sub-monolayer sensitivity and subnanosecond temporal resolution. We discuss possible future improvements of the SNSPD-based infrared emission spectrometer and its potential applications in molecular science.

Full Publication

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TOPAG Lasertechnik GmbH
Nieder-Ramstädter Str. 247
64285 Darmstadt, Germany
Phone: +49 6151 4259 78
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E-mail: info@topag.de