NT250 series
Tunable Wavelength UV-NIR Range DPSS Lasers
NT250 delivers hands‑free, no-gap tuning from 335 to 2600 nm from the one box. With its 1000 Hz repetition rate and more than 1.1 mJ output pulse energy in NIR the NT240 series laser establishes itself as an excelllent choice for applications like photoacoustic imaging, laser-induced fluorescence spectroscopy.
Features
- Customers recognized reliability
- Two years warranty
- Integrates DPSS pump laser and OPO into a single housing
- Dry, no water inside!
- Hands-free no-gap wavelength tuning from 335 to 2600 nm*
- 1000 Hz pulse repetition rate
- More than 1.1 mJ output pulse energy in NIR
- 1 – 4 ns pulse duration
- Remote control via key pad or PC
* Automatic wavelength scan is programmable
Applications
- Photoacoustic imaging
- Laser-induced fluorescence spectroscopy
- Pump-probe spectroscopy
- Photobiology
- Remote sensing
- Metrology
Description
NT250 series tunable laser systems integrates into a single compact housing a nanosecond Optical Parametric Oscillator (OPO) and Diode-Pumped Solid–State (DPSS) Q-switched pump laser.
Diode pumping enables fast data acquisition at high pulse repetition rates up to 1 kHz while avoiding frequent flashlamp changes that are common when flashlamp pumped lasers are used. Special cooling technology eliminates the need for tap water, thus further reducing running and maintenance costs.
All lasers feature motorized tuning across the specified tuning range. The output wavelength can be set from control pad with backlit display that is easy to read even while wearing laser safety glasses. Alternatively, the laser can be also controlled from personal computer using supplied LabVIEW™ drivers.
High conversion efficiency, stable output, easy maintenance and compact size make our systems excellent choice for many applications.
Benefits
- Hands-free wavelength tuning – no need for physical intervention
- High repetition rate (1000 Hz) enables fast data collection
- End diode pumping and water-free technology ensure high reliability and low maintenance costs
- Superior tuning resolution (1 – 2 cm‑1) allows recording of high quality spectra
- High integration level saves valuable space in the laboratory
- In-house design and manufacturing of complete systems, including pump lasers, guarantees on-time warranty and post warranty services and spares supply
- Variety of control interfaces: USB, RS232, LAN and WLAN ensures easy control and integration with other equipment
- Attenuator and fiber coupling options facilitate incorporation of NT250 systems into various experimental environments
Specifications
| Model | NT252 |
|---|---|
| OPO specifications 1) | |
| Wavelength range | |
| Signal | 670 – 1064 nm |
| Idler | 1065 – 2600 nm |
| SH | 335 – 669 nm |
| Pulse energy | |
| OPO 2) | 1100 μJ |
| SH 3) | 200 µJ |
| Pulse repetition rate | 1000 Hz |
| Pulse duration 4) | 1 – 4 ns |
| Linewidth 5) | < 10 cm‑1 |
| Minimal tuning step 6) | |
| Signal | 1 cm‑1 |
| Idler | 1 cm‑1 |
| SH | 2 cm‑1 |
| Polarization | |
| Signal | horizontal |
| Idler | vertical |
| SH | horizontal |
| Typical beam diameter 7) 8) | 3 × 6 mm |
| Pump laser | |
| Pump wavelength 9) | 532 nm |
| Typical pump pulse energy 10) | 4 mJ |
| Pulse duration 11) | 2 – 5 ns |
| Pulse energy stability (StdDev) | < 2.5 % |
| Physical characteristics | |
| Unit size (W × L × H) | 456 × 1040 × 297 mm |
| Power supply size (W × L × H) | 520 × 400 × 286 mm |
| Umbilical length | 2.5 m |
| Operating requirements | |
| Cooling | air-cooled |
| Room temperature | 18 – 27 °C |
| Relative humidity | 20 – 80 % (non-condensing) |
| Power requirements | 100 – 240 V AC, single phase, 50/60 Hz |
| Power consumption | < 1.5 kW |
| Cleanliness of the room | not worse than ISO Class 9 |
| Model | NT252 |
|---|
- Due to continuous improvement, all specifications are subject to change. Parameters marked typical are illustrative; they are indications of typical performance and will vary with each unit we manufacture. Unless stated otherwise, all specifications are measured at 750 nm and for basic system without options.
- Measured at maximum in the interval 700 – 750 nm. See tuning curves for typical outputs at other wavelengths.
- Measured at 400 nm. See tuning curves for typical outputs at other wavelengths.
- Measured at FWHM level with photodiode featuring 1 ns rise time and 300 MHz bandwidth oscilloscope.
- In signal and idler range.
- For manual input from PC. When wavelength is controlled from keypad, tuning resolution is 0.1 nm for signal, 1 nm for idler and 0.05 nm for SH.
- Measured at the wavelength indicated in the “Pulse energy” specification row.
- Beam diameter is measured at the 1/e² level at the laser output and can vary depending on the pump pulse energy.
- Separate output port for the 2nd and other harmonic are optional.
- The pump laser pulse energy will be optimized for best OPO performance. The actual pump laser output can vary with each unit we manufacture.
- Measured at FWHM level with photodiode featuring 1 ns rise time and 300 MHz bandwidth oscilloscope.
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.
Accessories and optional items
| Option | Features |
|---|---|
| -SH | Tuning range extension in UV range (335 – 670 nm) by second harmonic generation |
| -H, -2H | 1064 and 532 nm output via separate port |
| -FC | Fiber coupled output in 350 – 2000 nm range |
| -ATTN | Attenuator output in 335 – 2600 nm range |
| Option | Features |
|---|
Performance and drawings
Publications
Optical investigation of gold shell enhanced 25 nm diameter upconverted fluorescence emission
We enhance the efficiency of upconverting nanoparticles by investigating the plasmonic coupling of 25 nm diameter NaYF4:Yb, Er nanoparticles with a gold-shell coating, and study the physical mechanism of enhancement by single-particle, time-resolved spectroscopy. A three-fold overall increase in emission intensity, and five-fold increase of green emission for these plasmonically enhanced particles have been achieved. Using a combination of structural and fluorescent imaging, we demonstrate that fluorescence enhancement is based on the photonic properties of single, isolated particles. Time-resolved spectroscopy shows that the increase in fluorescence is coincident with decreased rise time, which we attribute to an enhanced absorption of infrared light and energy transfer from Yb3+ to Er3+ atoms. Time-resolved spectroscopy also shows that fluorescence life-times are decreased to different extents for red and green emission. This indicates that the rate of photon emission is not suppressed, as would be expected for a metallic cavity, but rather enhanced because the metal shell acts as an optical antenna, with differing efficiency at different wavelengths.
The Pan-STARRS1 photometric system
The Pan-STARRS1 survey is collecting multi-epoch, multi-color observations of the sky north of declination −30° to unprecedented depths. These data are being photometrically and astrometrically calibrated and will serve as a reference for many other purposes. In this paper, we present our determination of the Pan-STARRS1 photometric system: gP1, rP1, iP1, zP1, yP1, and wP1. The Pan-STARRS1 photometric system is fundamentally based on the Hubble Space Telescope Calspec spectrophotometric observations, which in turn are fundamentally based on models of white dwarf atmospheres. We define the Pan-STARRS1 magnitude system and describe in detail our measurement of the system passbands, including both the instrumental sensitivity and atmospheric transmission functions. By-products, including transformations to other photometric systems, Galactic extinction, and stellar locus, are also provided. We close with a discussion of remaining systematic errors.
Precise throughput determination of the panstarrs telescope and the gigapixel imager using a calibrated silicon photodiode and a tunable laser: initial results
We have used a precision-calibrated photodiode as the fundamental metrology reference in order to determine the relative throughput of the PanSTARRS telescope and the Gigapixel imager, from 400 nm to 1050 nm. Our technique uses a tunable laser as a source of illumination on a transmissive flat-field screen. We determine the full-aperture system throughput as a function of wavelength, including (in a single integral measurement) the mirror reflectivity, the transmission functions of the filters and the corrector optics, and the detector quantum efficiency, by comparing the light seen by each pixel in the CCD array to that measured by a precision-calibrated silicon photodiode. This method allows us to determine the relative throughput of the entire system as a function of wavelength, for each pixel in the instrument, without observations of celestial standards. We present promising initial results from this characterization of the PanSTARRS system, and we use synthetic photometry to assess the photometric perturbations due to throughput variation across the field of view.
