PL2250 series

Flash-Lamp Pumped Picosecond Nd:YAG Lasers
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  • Flash lamp pumped high pulse energy mode-locked lasers
  • Up to 100 mJ
  • 20 – 80 ps pulses
  • 10 – 20 Hz pulse repetition rate
  • Flash lamp pumped high pulse energy mode-locked lasers
  • Up to 100 mJ
  • 20 – 80 ps pulses
  • 10 – 20 Hz pulse repetition rate

Features & Applications

Features

  • Hermetically sealed DPSS master oscillator
  • Diode pumped regenerative amplifier
  • Flashlamp pumped power amplifier producing up to 100 mJ per pulse at 1064 nm
  • 30 ps pulse duration (20 ps optional)
  • Excellent pulse duration stability
  • Up to 20 Hz repetition rate
  • Streak camera triggering pulse with <10 ps jitter
  • Excellent beam pointing stability
  • Thermo-stabilized second, third, fourth and fifth harmonic generator options
  • PC control via USB and LabVIEW™ drivers
  • Remote control via keypad

Applications

  • Time resolved spectroscopy
  • SFG/SHG spectroscopy
  • Nonlinear spectroscopy
  • OPG pumping
  • Remote laser sensing
  • Satellite ranging
  • Other spectroscopic and nonlinear optics experiments

Description

PL2250 series lasers cost-effective design improves laser reliability and reduces running and maintenance costs.

Innovative design

The heart of the system is a diode pumped solid state (DPSS) master oscillator placed in a hermetically sealed monolithic block. The flashlamp pumped regenerative amplifier is replaced by an innovative diode pumped regenerative amplifier. Diode pumping results in negligible thermal lensing, which allows operation of the regenerative amplifier at variable repetition rates, as well as improved long-term stability and maintenance-free operation.

The optimized multiple-pass power amplifier is flashlamp pumped and is optimized for efficient amplification of pulse while maintaining a near Gaussian beam profile and low wavefront distortion. The output pulse energy can be adjusted in approximately 1% steps, at the same time as pulse-to-pulse energy stability remains less than 0.8% rms at 1064 nm.

Angle-tuned KD*P and KDP crystals mounted in thermostabilised ovens are used for second, third and fourth harmonic generation. Harmonic separators ensure the high spectral purity of each harmonic directed to different output ports.

Built-in energy monitors continuously monitor output pulse energy. Data from the energy monitor can be seen on the remote keypad or PC monitor. The laser provides several triggering pulses for synchronization of the customer‘s equipment. The lead or delay of the triggering pulse can be adjusted in 0.25 ns steps from the control pad or PC. Up to 1000 μs lead of triggering pulse is available as a pretrigger feature.

Precise pulse energy control, excellent short-term and long-term stability, and up to 20 Hz repetition rate makes PL2250 series lasers an excellent choice for many demanding scientific applications.

Simple and convenient laser control

For customer convenience the laser can be operated from master device or personal computer through USB (VCP, ASCII commands), RS232 (ASCII commands) or LAN (REST API) interfaces or from remote control pad with backlit display that is easy to read even while wearing laser safety glasses.

Specifications

ModelPL2251 PL2251A PL2251B PL2251C
MAIN SPECIFICATIONS 1)
Pulse energy
    at 1064 nm1 mJ 50 mJ 2) 80 mJ 2) 100 mJ
    at 532 nm 3)0.45 mJ25 mJ 40 mJ 50 mJ
    at 355 nm 4)0.3 mJ15 mJ 24 mJ 30 mJ
    at 266 nm 5)0.15 mJ7 mJ 10 mJ 12 mJ
    at 213 nm 6)n/ainquire
Pulse energy stability, (StdDev.) 7)
    at 1064 nm< 0.2 %< 0.8 %
    at 532 nm< 0.4 %< 1.0 %
    at 355 nm< 0.5 %< 1.1 %
    at 266 nm< 0.5 %< 1.2 %
Pulse duration (FWHM) 8)30 ± 3 ps
Pulse duration stability 9)± 1.0 ps
Repetition rate0 – 50 Hz 20 or 10 Hz 20 or 10 Hz 10 Hz
Polarizationlinear, vertical, >99 %
Pre-pulse contrast> 200:1 (peak-to-peak with respect to residual pulses)
Optical pulse jitter internal / external
    Internal triggering regime 10)< 50 ps (StdDev) with respect to TRIG1 OUT pulse
    External triggering regime 11)~3 ns (StdDev) with respect to SYNC IN pulse
SYNC OUT pulse jitter 10)-500 ... 50 ns
SYNC OUT pulse delay 12)-500 ... 50 ns
Beam divergence 13)< 1.5 mrad< 0.5 mrad
Beam pointing stability 14)≤ 15 μrad StdDev≤ 20 μrad StdDev
Beam diameter 15) ~ 2.5 mm ~ 8 mm ~10 mm ~12 mm
Typical warm-up time30 min
PHYSICAL CHARACTERISTICS
Laser head size (W × L × H)456×1031×249 mm ±3 mm456×1233×249 mm ±3 mm (for PL2251A, B with harmonic and C models)
456×1031×249 mm ±3 mm (for PL2251A, B models without harmonic)
Electric cabinet size (W × L × H)12 V DC power adapter, 85×170×41 mm ±3 mm550×600×550 ±3 mm (19″ standard, MR-9)
Umbilical length2.5 m
OPERATING REQUIREMENTS
Water consumption (max 20 °C )air cooledwater cooled, water consumption (max. 20 °C), <8 l/min, 2 bar
Room temperature22 ± 2 °C
Relative humidity20 – 80 % (non-condensing)
Power requirements 16)110 – 240 V AC, 50/60 Hzsingle phase, 200 – 240 V AC, 16 A, 50/60 Hz
Power 17)< 0.15 kVA< 1.5 kVA< 2.5 kVA< 2.5 kVA
  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 1064 nm and for basic system without options.
  2.  PL2251B-20 has 70 mJ at 1064 nm output energy. Inquire for these energies at other wavelengths.
  3. For -SH option. Outputs are not simultaneous. Inquire for these energies at other wavelengths.
  4. For -TH option. Outputs are not simultaneous. Please inquire for pulse energies at other wavelengths.
  5. For -FH option. Outputs are not simultaneous. Please inquire for pulse energies at other wavelengths.
  6. For PL2250 series laser with custom -FiH option.
  7. Averaged from pulses, emitted during 30 sec time interval.
  8. FWHM. Inquire for optional pulse durations in 20 – 90 ps range. Pulse energy specifications may differ from indicated here.
  9. Measured over 1 hour period when ambient temperature variation is less than ±1 °C.
  10. With respect to TRIG1 OUT pulse. <10 ps jitter is provided with PRETRIG standard feature.
  11. With respect to SYNC IN pulse.
  12. TRIG1 OUT lead or delay can be adjusted with 0.25 ns steps in specified range.
  13. Average of X- and Y-plane full angle divergence values measured at the 1/e² level at 1064 nm.
  14. Beam pointing stability is evaluated from fluctuations of beam centroid position in the far field.
  15. Beam diameter is measured at 1064 nm at the 1/e² point.
  16. Three phase 208 or 380 VAC mains are required for 50 Hz versions.
  17. For 10 Hz version.

If laser is optimised for pumping parametrical generator, maximum output energy may be different than specified for stand alone application.

Note: Laser must be connected to the mains electricity all the time. If there will be no mains electricity for longer that 1 hour then laser (system) needs warm up for a few hours before switching on.

Options

Option P20

Provides 20 ps ± 10% output pulse duration. Pulse energies are 30% lower in comparison to the 30 ps pulse duration version. Linewidth <2 cm-1 at 1064 nm. See table below for pulse energy specifications:

ModelPL2251A-10PL2251B-10PL2251C-10
1064 nm35 mJ60 mJ80 mJ
532 nm17 mJ30 mJ40 mJ
355 nm12 mJ18 mJ24 mJ
266 nm5 mJ8 mJ10 mJ

Option P80

Provides 80 ps ±10% output pulse duration. Pulse energy specifications as below:

Model PL2250 PL2251A PL2251B PL2251C
Pulse energy at 1064 nm 1.5 mJ 70 mJ 100 mJ 160 mJ

Option PLL

Allows locking the master oscillator pulse train repetition rate to an external RF generator, enabling precise external triggering with low jitter. Inquire for more information.

Performance & Drawings

Publications

Found total :
2 articles, 2 selected
Application selected :
All Applications
All Applications
Laser Spectroscopy
Luminescence Spectroscopy

How nature covers its bases

Related applications:  Laser Spectroscopy Luminescence Spectroscopy

Authors:  S. Boldissar, M. S. de Vries

The response of DNA and RNA bases to ultraviolet (UV) radiation has been receiving increasing attention for a number of important reasons: (i) the selection of the building blocks of life on an early earth may have been mediated by UV photochemistry, (ii) radiative damage of DNA depends critically on its photochemical properties, and (iii) the processes involved are quite general and play a role in more biomolecules as well as in other compounds. A growing number of groups worldwide have been studying the photochemistry of nucleobases and their derivatives. Here we focus on gas phase studies, which (i) reveal intrinsic properties distinct from effects from the molecular environment, (ii) allow for the most detailed comparison with the highest levels of computational theory, and (iii) provide isomeric selectivity. From the work so far a picture is emerging of rapid decay pathways following UV excitation. The main understanding, which is now well established, is that canonical nucleobases, when absorbing UV radiation, tend to eliminate the resulting electronic excitation by internal conversion (IC) to the electronic ground state in picoseconds or less. The availability of this rapid “safe” de-excitation pathway turns out to depend exquisitely on molecular structure. The canonical DNA and RNA bases are generally short-lived in the excited state, and thus UV protected. Many closely related compounds are longer lived, and thus more prone to other, potentially harmful, photochemical processes. It is this structure dependence that suggests a mechanism for the chemical selection of the building blocks of life on an early earth. However, the picture is far from complete and many new questions now arise.

Published: 2018.   Source: Phys. Chem. Chem. Phys., 2018,20, 9701-9716

Excited State Dynamics of 6‑Thioguanine

Related applications:  Laser Spectroscopy Luminescence Spectroscopy

Authors:  F. M. Siouri, S. Boldissar, J. A. Berenbeim, M. S. de Vries

Here we present the excited state dynamics of jet-cooled 6-thioguanine (6-TG), using resonance-enhanced multiphoton ionization (REMPI), IR–UV double resonance spectroscopy, and pump–probe spectroscopy in the nanosecond and picosecond time domains. We report data on two thiol tautomers, which appear to have different excited state dynamics. These decay to a dark state, possibly a triplet state, with rates depending on tautomer form and on excitation wavelength, with the fastest rate on the order of 1010 s–1. We also compare 6-TG with 9-enolguanine, for which we observed decay to a dark state with a 2 orders of magnitude smaller rate. At increased excitation energy (∼+500 cm–1) an additional pathway appears for the predominant thiol tautomer. Moreover, the excited state dynamics for 6-TG thiols is different from that recently predicted for thiones.

Published: 2017.   Source: J. Phys. Chem. A 2017, 121, 28, 5257-5266

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