DPSS Laser

Regarding the wavelength and their specific applications.

Precision laser marking for medical applications, Ultraviolet DPSS lasers work with wider range of materials, UV laser marking

For all wavelengths from UV/blue to green/yellow:
medical imaging 
flow cytometry 
DNA sequencing

Furthermore for wavelength starting from 405nm:
measurement
communication
spectrum analysis
medical treatment
cell sorting
fluorescence excitation

In addition for wavelengths between 450nm and 488nm:
fluorescence sensors 
raman spectrum 
laser printing 
chip inspection 
medical imaging


DPSS lasers  (Diode-pumped solid-state ) are solid-state lasers made by pumping a solid gain medium, a ruby or a neodymium-doped YAG crystal, with a laser diode. More knowledge about DPSS laser at wikipedia

DPSS lasers have advantages in compactness and efficiency over other types, and high power DPSS lasers have replaced ion lasers and flashlamp-pumped lasers in many scientific applications, and are now appearing commonly in green and other color laser pointers.

Here are some News summary in laser industry:

CEO John Ambroseo from Coherent said that their 3kW fiber laser are used in metal cutting. Coherent showed 3kW fiber laser in May of Laser World of Photonics exhibition. It is currently being tested on the client device. Single package cutting speed and quality meet the requirements , and output power is far less than competitors.

In the year of 2014, DPSS 355nm laser is popular in many applications. They're used in laser cutting,marking and 3D printing. 355nm laser is UV laser, that is Ultra Violet, there is also deep ultraviolet 266nm laser.

450nm DPSS blue laser for image processing, with the wavelength from 445nm - 450nm.

New developed DPSS laser:

End-pumped QCW DPSS lasers, 1064/532 for marking ( up to 8W ), UV QCW lasers (up to 8W), DUV QCW lasers (up to 2W ), QCW/CW lasers (up to 30W )

Side-pumped QCW DPS lasers: ND:YAG laser for diamond cutting 1064nm/532nm/355nm/266nm, and Nd:YAG laser at 1064nm/532nm/355nm/ with the high power up to 5000W. 

Quasi-Pico lasers, 1064nm/532nm/355nm (pulse width< 1nm)

Here are many customized lasers as following:

Pico-second laser
1319nm CW(QCW) 100W Solid-state lasers
660nm 100W Solid-state Lasers
2um wavelength lasers
1.54um eye-safe lasers
Er-doped Lasers
457nm Blue Lasers
589nm yellow lasers
Lamp-pumped 1J high-energy lasers
LD-pumped 350mj high-energy Lasers
Single longitudinal mode Lasers
LD-pumped EO Q-switched pulsed lasers
LD Passively Q-switched pulsed lasers
Tunable lasers
4-wavelength switching 1064nm/532nm/355nm/266nm laser
3-wavelength switching 1053nm/527nm/351nm laser
2-wavelength switching 1342nm/671nm laser

The DPSS lasers are used in : plastic marking, metal material processing, precision processing, nonlinear optics, pollution monitoring, LIBS, engine and hybrid gas ignition,supercontinuum, DNA analysis, laser ranging, fluorescence measurements.

DPSS laser

The advantages of DPSS laser

1. High power (interesting for compensating for poor coupling, doing beam splitting etc...).
2. The possibility to easily manipulate laser beams (launching into optical fibers,   beam splitting, wavelength division etc).

Limitations:

1. Most DPSS systems can be modulated to only deliver a fraction of the maximal output power in steady state conditions. But the relation between this analog modulation voltage and the emitted power is not necessarily linear. Therefore it is necessary to map the output of your laser using a power meter. 

2.Although most affordable DPSS systems have fast (1-5 kHz) on/off TTL modulation, the resulting pulses have unexpected (but reproducible) power and shape.
  Let's say for example that you set your laser to deliver 20% of its maximal power in steady state operating conditions. Triggering the laser on/off using a TTL input will allow you to produce millisecond scale light pulses but the maximal power reached during the pulse will not be 20% (it can be more or less than that), and the pulse will have strange temporal characteristics (slow onset and offset, oscillation etc...). The only way to know what your laser is giving during short pulses is to measure them.


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