Compact High-Energy DPSS Sub-Nanosecond Laser
The SubNaples “Mini” series of Passat’s DPSS lasers, with their pulsewidth of 500 ps (at fundamental wavelength) and pulse energy of up to 3 uJ at 213 nm, are some of the most compact deep UV lasers available on the market.
As such, these devices are especially suitable for the analytical instrumentation market as stable laser sources for spectroscopy, photo-dissociation and ionization applications.
Simple to operate with extensive control via software, they are also an attractive option for a researcher/ educator looking for a compact yet powerful UV laser.
Sub-Naples Mini can emit multitude of wavelengths, up to the 5th harmonic of Nd-YAG. The laser head is air-cooled and is connected to a small power/control module via a single electrical cable assembly. The laser is rugged and thermally stabilized, providing stable continuous output at up to 3 kHz pulse repetition rate.
- 400 picosecond pulse width (at 213 nm)
- >2 µJ/pulse (at 213 nm)
- >100 µJ/pulse (at 1064 nm)
- 1,000 Hz repetition rate (optional 3 kHz)
- TEM00 mode
- Air cooled
- External triggering or computer controlled, including burst mode
- Compact laser head (see dimensions at the bottom of this page)
- Raman spectroscopy and microscopy
- Writing of Bragg fiber grating and nano-structuring
- Laser ablation in analytical chemistry, ICP-MS, photo-dissociation and ionization
- Ophtalmology, bio-medical application
- Scientific research
Sub-Naples Mini specifications
|Wavelength||213 nm||266 nm||355 nm||532 nm||1064 nm|
|Typical Energy output (at 1 kHz)||2 µJ||10 µJ||15 µJ||40 µJ||80 µJ|
|Pulse width||400 ps|
|Repetition rate||Internal/external triggering, 1,000 Hz|
|Beam quality||Diffraction limited|
|Beam profile||TEMoo Gaussian|
|Pulse-to-pulse standard deviation||<2%|
|Output beam pointing stability (std dev, 1 hour)||~0.5 Diffraction limit|
|External control||Connector for TTL trigger input port (4 +/-1V, 1 kΩ)|
|Electrical power||~ 100-240VAC, 47-63 Hz, single phase|
|Power consumption||< 30 W|
|Warm-up time||Less than 2 minutes|
|Operating temperature and humidity||18-38 oC; 10-85 %|
- Laser head
- Pumping control unit
- Control cable
- Power cord
- Media with manual and control software
1 year for all parts and labor excluding the laser pump diode. The pump diode is warranted for the lesser of 1 year or 5*109 pulses.
The laser is thermally stabilized over its range of operational temperatures. Laser runs of about 1 million pulses at different ambient temperatures show that the average pulse energy is not affected by external temperature.
Pumping control unit’s dimensions are: 221 x 176 x 54 mm
Stability Assessment of DPSS UV Laser SubNapels 213 Mini
Test over a range of ambient temperatures
The laser was tested in a range of ambient temperatures, starting from 22.5 to 41.5 deg. Celsius. The average energy was 1.925 uJ with standard deviation of 32 nJ (short term) and 55 nj (long term, over 16 hours).
The laser head was placed in a thermal chamber (Fig. 1) and its operation was monitored while the temperature was gradually increased from 22.5 deg (the current ambient) to 41.5 degrees, at which point the heat source was stopped.
The screensh0t below shows the energy output during this time. The drop at 7 min is due to the placement of the thermal chamber cover over the laser beam and aligning the beam to exit through an opening in the lid. It is at this time that the heat source was started inside the chamber. The peak temperature was reached at 29.5 min on this time scale and the heat was switched off at this time. The energy output was maintained with a standard deviation of about 60 nJ over the heating cycle.
Long term (overnight) test
After this test, which lasted about half an hour, the laser was left running for 16 hours overnight to test its behavior during the ambient temperature swings at night.
In the morning, the ambient temperature was 22 degrees and the internal temperature of the laser head was stable at 26 degrees. The energy output over the 16 hours was with average of 2.001 uJ +/- 56 nJ (Fig. 3). Please, note that the noise floor of the pyroelectric detector is not less than 25 nJ. The total count of the pulses accumulated over this time was 57.5 million.
The next screenshot shows the typical energy output from the laser including the initial warm-up time. The laser becomes thermally stable in less than a minute from a cold (power plug OFF) start.
The short-term output energy statistics of the laser is represented by the data in the screenshot below:
The standard deviation of the output energy at 213 nm over a 1-min run is 34 nJ (very close to the noise floor of the measuring head). A longer run (5 min) is shown in the screenshot below:
Here the standard deviation of the output energy is slightly larger at 40 nJ (2%).
The screenshot below shows three laser runs at different temperatures, each for about a million pulses:
A 4-hour run of the laser was performed very recently. The data are shown in the screenshot below. The average energy is 1880 nJ with standard deviation of 42 nJ.