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Applications
 　
　 　
■ DNA sequencing ■ Sepectrum analysis
■ Interference ■ Measurement
■ Holography ■ Laser printing
■ Medicine diagnosis ■ Flow cytometr
■ Cell sorting ■ Chip inspection
　

A single-frequency laser is a laser which operates on a single longitudinal mode, so that it emits quasi-monochromatic radiation with a very small linewidth and low phase noise. Because any mode competition is eliminated, single-frequency lasers also have the potential to have very low intensity noise.

　
Multiple frequency
 　
Single-frequency

Normal longitudinal mode spectrum of a DPSS laser using a scanning interferometer.

 　
Spectrum analyzer display of single longitudinal mode output
Single Frequency DPSS Lasers
Wavelength (nm)
Average.power(mW)
473
532
671
1 - 20
1064
1-20

　
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