>Narrow Linewidth Laser
>Low Noise Single Frequency Laser (Koheras AdjustiK, C15)
Koheras ADJUSTIK low noise single-frequency lasers
The Koheras ADJUSTIK is a rack-mountable benchtop single-frequency DFB fiber laser. Based on our renowned BASIK modules, the ADJUSTIK is the pinnacle of industrial low noise lasers featuring ultra-low phase noise and Hz-range linewidth normally only found in costly scientific systems.
This range of benchtop laser systems is typically offered as rapidly deployable sources for research laboratories that wish to use it as a tool for scientific work and not spend time on setting up a laser system.
The benchtop models are based on our Koheras BASIK Module seed technology and are upgradable in terms of output power. The systems are supplied with our NKTP CONTROL software for the control and read-out of laser parameters on a PC such as a wavelength, output power , and RIN suppression.
Standard or high power?
Standard systems are available at 1550.12 nm and 1064.00 nm and we offer special systems anywhere in the 1535–1580 nm and 1030–1120 nm ranges. Depending on the model, output powers are 10-40 mW.
If higher powers are needed, choose the ADJUSTIK HP that delivers up to 2 W output power.
Ideal for low-noise applications
The ADJUSTIK lasers are ideal for experimental work for all kinds of low noise applications eg for metrology and coherent sensing where laser noise is critical.
Center wavelengths in the 1535–1580 nm and 1030–1120 nm ranges
High-power: Up to 2 W
Industry-leading low phase noise and extremely narrow linewidth
Stable single-frequency operation
Wide thermal wavelength tuning
Integrated fast wavelength modulation
Polarization-maintaining fiber output
Robust and maintenance-free
22.5 mW *
> 10 mW *
> 10 mW *
*) Fixed output power (non-adjustable)
Is a Co-doped Erbium/Ytterbium fiber laser for operation in the 1535-1580 nm wavelength range offering the lowest intensity noise (RIN) and is a shot noise limited fiber laser. C15: Is a Co-doped Erbium / Ytterbium fiber laser for operation in the 1535-1580 nm wavelength range offering the lowest intensity noise (RIN) and is a shot noise limited fiber laser.
Is an Erbium-doped fiber laser for operation in the 1535-1580 nm wavelength range offering the lowest phase and frequency noise and narrowest linewidth of the entire laser portfolio. It is often deployed for interferometric sensor applications demanding 10s of kilometers of coherence length and ultra-high frequency stability. X15 / E15: Is an Erbium-doped fiber laser for operation in the 1535-1580 nm wavelength range offering the lowest phase and frequency noise and narrowest linewidth of the entire laser portfolio. It is often deployed for interferometric sensor applications demanding 10s of kilometers of coherence length and ultra-high frequency stability.
Ytterbium-doped fiber laser system for operation in the 1030-1120 nm wavelength range with narrow linewidth and low-intensity noise. This laser is commonly used for laser stabilization, atomic physics/metrology, spectroscopy, fusion energy, general replacement of conventional Nd:YAG lasers, and many other applications. Y10: Ytterbium-doped fiber laser system for operation in the 1030-1120 nm wavelength range with narrow linewidth and low-intensity noise. This laser is commonly used for laser stabilization, atomic physics / metrology, spectroscopy, fusion energy, general replacement of conventional Nd: YAG lasers, and many other applications.
Other product features
PM operation: The output of the ADJUSTIK fiber laser is a Single Mode Fiber with PM (Polarisation Maintaining) output to ensure a fixed orientation of the polarisation. This may be required whenever the laser output needs to be externally modulated or frequency converted.
Thermal wavelength tuning: The Koheras fiber laser systems are per default thermally tunable to enable the user to match and stabilize the laser at a certain wavelength.
Fast wavelength tuning: This feature can be offered for applications demanding higher wavelength stability than provided by the free-running laser. It enables the laser eg to be locked to an external reference such as an atomic transition line or interferometer.
Linewidth reduction to <5 kHz (C15 and Y10 models).
CW-inherently single frequency
Output power [mW]
Beam quality [M²]
Linewidth [kHz] *
Max phase noise [dB ((Rad / √Hz) / m)]
-105 @ 1 Hz
-125 @ 10 Hz
-130 @ 100 Hz
-128 @ 1 kHz
-90 @ 10 Hz
-110 @ 100 Hz
-130 @ 20 kHz
-69 @ 10 Hz
-89 @ 100 Hz
-109 @ 20 kHz
Max phase noise [(µrad / √Hz) / m]
3.1 @ 1 Hz
32 @ 10 Hz
355 @ 10 Hz
36 @ 100 Hz
RIN peak [MHz]
RIN level @ peak / 10 MHz [dBc / Hz]
<-100 / <-135
<-120 / <-140
<-105 / <-140
Optical S / N (50 pm res.) [DB]
> 50 (typ.> 55)
> 50 (typ.> 55)
> 65 (typ> 70)
> 65 (typ> 70)
Min thermal wavelength tuning range [pm] **
Total thermal tuning range [pm]
Fast wavelength modulation range [GHz]
Fast wavelength modulation [kHz]
Up to 20
PM output-PER [dB]
** Relative to center wavelength at room temperature. If the laser is operated in very cold or hot environments, this wavelength range is truncated on either the upper or lower side
Mechanical / Electrical
Power supply requirements [VAC]
100-240, 50-60 Hz
USB 2.0, Ethernet 10/100
Amplitude and frequency modulation
DB9 (male), differential 2x5 V
Fiber output type
FC / APC
Fiber pigtail length [m]
Yes (FC / APC bulkhead)
Dimensions (WxHxL) [mm]
483 x 48.5 x 386 (19 ”1U)
Operating temperature range [° C]
15-55 (internal case temp)
Storage temperature [° C]
Humidity non condensing [% RH]
Product attributes [wavelength] 1550.12 nm / 1535-1580 nm [power] > 10mW