NT350 series

High Energy NIR Range Tunable Lasers
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  • Integrated OPO system
  • Pumped by 532 nm offering high output in NIR
  • Up to 150 mJ in range 660 – 2450 nm
  • At 10/20 Hz pulse repetition rate
  • Integrated OPO system
  • Pumped by 532 nm offering high output in NIR
  • Up to 150 mJ in range 660 – 2450 nm
  • At 10/20 Hz pulse repetition rate

Features & Applications

Features

  • Hands-free, automated wavelength tuning from 660 to 2450 nm
  • Up to 150 mJ pulse energy in near-IR spectral range
  • Narrow linewidth across tuning range
  • 3 – 5 ns pulse duration
  • Remote control pad
  • PC control via RS232 and LabVIEW™ drivers
  • Separate output port for 532 nm beam. Output for 1064 nm is optional
  • OPO pump energy monitoring
  • Replacement of the flashlamps can be done without misalignment of the laser cavity
  • Hermetically sealed oscillator cavity protects non-linear crystals from dust and humidity

Applications

  • Photoacoustic imaging
  • Photobiology
  • Remote sensing
  • Time-resolved spectroscopy
  • Non-linear spectroscopy
  • Other laser spectroscopy applications

Description & Options

NT352 series tunable laser seamlessly integrates in a compact housing a nanosecond optical parametric oscillator and Nd:YAG Q-switched laser.

Three models with different output pulse energy values are offered. The most powerful model has more than 150 mJ pulse energy at 700 nm. Narrow linewidth (<10 cm⁻¹) is nearly constant trough whole tuning range, which makes laser suitable for many spectroscopy application.

The device is controlled from the remote keypad or from PC through RS232 interface using LabVIEW™ drivers that are supplied with the system. The remote pad features a backlit display that is easy to read even while wearing laser safety glasses.

System is designed for easy and cost-effective maintenance. Replacement of flashlamps can be done without misalignment of the laser cavity and deterioration of laser performance. OPO pump energy monitoring system helps to increase lifetime of the optical components.

Optional items are available allowing optimization of the laser system for Your application, for example:

  • Fiber coupled output in 350 – 2000 nm range;
  • Efficient second harmonic generator for 330 – 530 nm range;
  • Pulse energy attenuator;
  • Water-air cooled power supply.

Please inquire custom-build versions and options.

Specifications

ModelNT352ANT352BNT352C
OPO 1)
Wavelength range
    Signal660 – 1064 nm
    Idler1065 – 2450 nm
    SH330 – 530 nm
OPO output pulse energy 2)70 mJ110 mJ150 mJ
Linewidth 3)< 10 cm-1
Tuning resolution 4)
    Signal (660 – 1064 nm)1 cm⁻¹
    Idler (1064 – 2450 nm)1 cm⁻¹
    SH (330 – 530 nm)2 cm⁻¹
Pulse duration 5)3 – 5 ns
Typical beam diameter 6)5 mm7 mm
Typical beam divergence 7)< 2 mrad
Polarization
    Signal beamhorizontal
    Idler beamvertical
    SH beamvertical
PUMP LASER 8)
Pump wavelength532 nm
Max pump pulse energy230 mJ350 mJ450 mJ
Pulse duration4 – 6 ns
Beam quality"Hat-top" in near field. Close to Gaussian in far field
Beam divergence< 0.6 mrad
Pulse energy stability (StdDev)< 2.5 %
Pulse repetition rate10 or 20 Hz10 Hz
PHYSICAL CHARACTERISTICS
Unit size (W × L × H)452 × 610 × 270 mm452 × 1020 × 270 mm
Power supply size (W × L × H)330 × 490 × 585 mm550 × 600 × 530 mm
Umbilical length2.5 m
OPERATING REQUIREMENTS
Water consumption (max 20 °C) 9)6 l/min10 l/min
Room temperature15 – 30 °C
Relative humidity20 – 80 % (non-condensing)
Power requirements 10)208 or 240 V AC, single phase 50/60 Hz
Power consumption 11)1.8 / 3.4 kVA1.8 kVA
  1. Due to continuous improvement, all specifications are subject to change without notice. The 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 700 nm and for basic system without options.
  2. Measured at 700 nm for OPO and 350 nm for SH. See tuning curves for typical outputs at other wavelengths.
  3. In signal and idler range.
  4. When wavelength is controlled from PC. When wavelength is controlled from keypad, tuning resolution is 0.1 nm for signal, 1 nm for idler and 0.5 nm for SH.
  5. FWHM measured with photodiode featuring 1 ns rise time and 300 MHz bandwidth oscilloscope.
  6. Beam diameter is measured at 700 nm at the 1/e² level and can vary depending on the pump pulse energy.
  7. Full angle measured at the FWHM level at 700 nm.
  8. Separate output port for the 532 nm beam is standard. Output for 1064 nm beam is optional. Pump laser output will be optimized for OPO operation and specification may vary with each unit we manufacture.
  9. At 10 Hz pulse repetition rate. Air cooled power supply is available as option.
  10. Mains voltage should be specified when ordering.
  11. At 10/20 Hz pulse repetition rate.

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.

Performance

Publications

Found total :
6 articles, 6 selected
Application selected :
All Applications
All Applications
Biomedical – applications focusing on the biology of human health and disease
Photoacoustic Imaging – biomedical imaging modality based on the photoacoustic effect

Image Enchancement Algorithm of Photoacoustic Tomography using Active Countour Filtering

Related applications:  Photoacoustic Imaging Biomedical

Authors:  P. Palaniappan, D. H. Shin, C. G. Song

The photoacoustic images are obtained from a custom developed linear array photoacoustic tomography system. The biological specimens are imitated by conducting phantom tests in order to retrieve a fully functional photoacoustic image. The acquired image undergoes the active region based contour filtering to remove the noise and accurately segment the object area for further processing. The universal vack projection method is used as the image reconstruction algorithm. The active contour filtering is analyzed by evaluating the signal to noise ratio and comparing it with the other filtering methods.

Published: 2016.   Source: World Academy of Science, Engineering and Technology International Journal of Computer and Information Engineering Vol:10, No:4, 2016

Detecting Rat’s Kidney Inflammation Using Real Time Photoacoustic Tomography

Related applications:  Photoacoustic Imaging Biomedical

Authors:  M. Y. Lee, D. H. Shin, S. H. Park, W.C. Ham, S.K. Ko, C. G. Song

Photoacoustic Tomography (PAT) is a promising medical imaging modality that combines optical imaging contrast with the spatial resolution of ultrasound imaging. It can also distinguish the changes in biological features. But, real-time PAT system should be confirmed due to photoacoustic effect for tissue. Thus, we have developed a real-time PAT system using a custom-developed data acquisition board and ultrasound linear probe. To evaluate performance of our system, phantom test was performed. As a result of those experiments, the system showed satisfactory performance and its usefulness has been confirmed. We monitored the degradation of inflammation which induced on the rat’s kidney using real-time PAT.

Published: 2017.   Source: World Academy of Science, Engineering and Technology International Journal of Biotechnology and Bioengineering Vol:11, No:8, 2017

A Custom Developed Linear Array Photoacoustic Tomography for Noninvasive Medical Imaging

Related applications:  Photoacoustic Imaging Biomedical

Authors:  P. Palaniappan, D. H. Shin, S. H. Park, M. Y. Lee, B. Y. Kim, S. Y. Lee, S. K. Go, C. G. Song

A real-time photoacoustic tomography which is capable of imaging the changes in biological features of living subject is presented. A custom developed data acquisition board and linear array transducer is used in this photoacoustic system. A phantom test were carried out to evaluate performance of the system. The developed system showed a satisfactory performance and its usefulness were evaluated. The universal back projection algorithm is used for image reconstruction and the sensitivity is analyzed from the obtained photoacoustic images.

Published: 2016.   Source: Event: 2016 IEEE International Conference on Consumer Electronics-Asia (ICCE-Asia)

Photoacoustic signal detection using interferometric fiber-optic ultrasound transducers

Related applications:  Photoacoustic Imaging Biomedical

Authors:  A. D. Salas-Caridad, G. Martínez-Ponce, R. Martínez-Manuel

The cross-section of a metallic sample was photoacoustically imaged using a pulsed nanosecond laser as the excitation source and a fiber-optic hydrophone system to acquire the pressure signal. The ultrasound sensor was an extrinsic Fabry-Perot fiber-optic interferometer and the band-limited photodetected output signal was recorded in a digital oscilloscope. In order to reconstruct the image, a time set of ultrasound signals acquired in a circular scan around the sample were used to solve the time-reversal equations. It was observed that image contrast can be enhanced considering the deconvolution of the sensor frequency response from each measured pressure signal.

Published: 2017.   Source: Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

Hydrophones based on interferometric fiber-optic sensors with applications in photoacoustics

Related applications:  Photoacoustic Imaging Biomedical

Authors:  A. D. Salas-Caridad, B. Eng.

Biomedical imaging used for medical diagnosis constantly requires improvement in the characteristics for imaging devices. The sensing devices are one of the most important pieces to improve in order to get images with better quality. In this thesis, it is proposed the use of interferometric fiber-optic sensors (which offer the advantages inherent to optical fibers) as devices to detect pressure/acoustic signals generated by the photoacoustic effect. It is explored the capability of using fiber-optic interferometric hydrophones in order to determine the thickness of a material derived from the acoustic signal generated when a sample is illuminated. In addition, the analysis of photoacoustic signals generated by the excitation of nanoparticles of an anisotropic material as absorption centers. Finally, the cross-section of a metallic sample was photoacoustically imaged by acquiring the pressure signals generated.

Published: 2017.   Source: Master of Optomechatronics | Leon, Guanajuato, Mexico

Enhancement of objects in photoacoustic tomography using selective filtering

Related applications:  Photoacoustic Imaging Biomedical

Authors:  D. Shin, Y. Yang, C. G. Song

Here we developed a real-time photoacoustic tomography (PAT) imaging acquisition device based on the linear array transducer utilized on ultrasonic devices. Also, we produced a phantom including diverse contrast media and acquired PAT imaging as the light source wavelength was changing to see if the contrast media reacted. Indocyanine green showed the highest reaction around the 800-nm band, methylene blue demonstrated the same in the 750-nm band, and gold nanoparticle showed the same in the 700-nm band. However, in the case of superparamagnetic iron oxide, we observed not reaction within the wavelength bands used herein to obtain imaging. Moreover, we applied selective filtering to the acquired PAT imaging to remove noise from around and reinforce the object’s area. Consequentially, we could see the object area in the imaging was effectively detected and the image noise was removed.

Published: 2015.   Source: Bio-Medical Materials and Engineering 26 (2015) S1223–S1230

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