Long Coherence Length Laser

Laser coherence length is defined as the distance over which the beam can travel without experiencing a phase discontinuity. This is a critical parameter in applications such as holography and interferometry where beams may be required to split with each leg going a long distance before being recombined. The coherence length is directly related to the linewidth of the laser. As a result, long coherence length lasers are almost exclusively single mode. Here at RPMC Lasers, we offer a wide range of laser diodes and DPSS lasers with a coherence length of more than 1m. We offer a selection of stabilization technologies like distributed feedback (DFB), distributed Bragg reflector (DBR), and volume Bragg grating (VBG) diode lasers. We also have temperature and current stabilized DPSS solutions to better fit your needs.

Part Number	Wavelength (nm)	Description	Type
LGK-XXX	543, 594, 633	He-Ne Laser Module, Single mode, 543-633nm, up to 20mW	HeNe Lasers, Narrow Linewidth, Long Coherence Length, Single Longitudinal Mode (SLM), Collimated Beam, Fiber-Coupled
LGR-XXX	543, 594, 633	He-Ne Laser Replacement Tube, Single mode, 543-633nm, up to 20mW	HeNe Lasers, Narrow Linewidth, Long Coherence Length, Single Longitudinal Mode (SLM), Collimated Beam, Fiber-Coupled
LXC-Combiner	Multiple Wavelength Options	Laser Combiner, Single mode, up to 6 Wavelengths, 375-1064nm, up to 500mW	LD Module, CW DPSS Lasers, Narrow Linewidth, Long Coherence Length, Single Longitudinal Mode (SLM), Collimated Beam, Fiber-Coupled, Customizable
LXX-IR-SLM	785, 830, 1064	Laser Module, Stabilized, Infrared, 785-1064nm, up to 300mW	LD Module, CW DPSS Lasers, Narrow Linewidth, Long Coherence Length, Single Longitudinal Mode (SLM), Collimated Beam, Fiber-Coupled, Customizable
LXX-VIS-SLM	532, 553, 561, 633	Laser Module, Stabilized, Visible, 532-633nm, up to 300mW	LD Module, CW DPSS Lasers, Narrow Linewidth, Long Coherence Length, Single Longitudinal Mode (SLM), Collimated Beam, Fiber-Coupled, Customizable
MB-IR-SLM	785, 830, 1030, 1064	Laser Module, Stabilized, Infrared, 783-1064nm, up to 500mW	LD Module, CW DPSS Lasers, Narrow Linewidth, Long Coherence Length, Single Longitudinal Mode (SLM), Collimated Beam, Fiber-Coupled
MB-VIS-SLM	405, 488, 520, 633	Laser Module, Stabilized, Visible, 405-633nm, up to 170mW	LD Module, CW DPSS Lasers, Narrow Linewidth, Long Coherence Length, Single Longitudinal Mode (SLM), Collimated Beam, Fiber-Coupled

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Long Coherence Length Laser Applications:

Some applications that benefit from long coherence length lasers:

Holography: Long-coherence length lasers are ideal for holography because they can split beams that travel long distances before recombining.
Precision measurement: Coherence length is important for precision measurement tools like interferometers, which measure changes in distance and displacement.
Telecommunications: Coherence length helps ensure that signals can be transmitted with minimal distortion in fiber-optic cables.
Other applications: Long coherence length lasers are also used in DNA sequencing, flow cytometry, digital imaging, analytical chemistry, particle measurement, confocal microscopy, and Raman spectroscopy.

How Can We Help?

With over 25 years of laser experience working in various markets and applications, and 1000s of units fielded, we have the experience to ensure you get the right product for the application. Working with RPMC ensures you are getting trusted advice from our knowledgeable and technical staff on a wide range of laser products. RPMC and our manufacturers are willing and able to provide custom solutions for your unique application.

If you have any questions, or if you would like some assistance please Contact Us here. Furthermore, you can email us at [email protected] to talk to a knowledgeable Product Manager.

Finally, our Lasers 101 page, Blogs, Whitepapers, and FAQ pages in our Knowledge Center for further, in-depth reading.

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