Koheras HARMONIK high-power frequency-doubled laser system

The Koheras HARMONIK fiber laser system provides over 7 W output at 780 nm with a unique combination of low noise, narrow linewidth, and excellent beam quality. It is alignment-free and maintenance-free.

Koheras HARMONIK fiber laser system

The HARMONIK system is a high-power frequency-doubled laser system consisting of our popular low-noise Koheras BOOSTIK HP fiber laser platform in combination with our new frequency converter module, HARMONIK.

The system gives you simultaneous power operation at the fundamental and second harmonic frequency.

Choose from two HARMONIK systems, the C7 or the E7.

The C7 has an exceptionally low relative intensity noise: A RIN level of -140 dBc/Hz at 10 MHz.

The E7 has a narrow linewidth and very low phase noise: A line-width of <0.2 kHz and phase noise of -87 dB((rad/√Hz)/m) at 10 Hz.

High standard output power

For both systems, the standard output power is greater than 7 W. It is possible to get above 7 W at 780 nm and 1560 nm or 766 nm and 1533 nm, simultaneously. If you need a higher output power, please contact us about custom power levels.

Having a fiber-deliverable high-power source allows for multipurpose functionality.

Ideal for quantum optics

The excellent beam quality, M2 < 1.1, is suitable for cutting edge quantum optics projects such as Magneto-Optical Trap (MOT), quantum sensing, gravimetry, and laser cooling and trapping, to mention a few.

With its ultra-stable and narrow linewidth, the BOOSTIK HP laser system is ideal for applications such as quantum optics, computing, and other phenomena like optical trapping, optical lattice, Bose-Einstein condensate, atom interferometer, and squeezing.

Other possible application areas are non-linear optics pump source (SHG, DFG, OPO) and laser-based metrology such as precision laser interferometry and spectroscopy.

Fast wavelength modulation

The systems are equipped with easy and user-friendly fast wavelength modulation. This feature is typically used to lock the laser to an external stable reference — such as an atomic transition line or interferometer — to obtain even higher wavelength stability than provided by the free-running laser.

The HARMONIK systems offer a 15 GHz mode hop-free tunability with a 10% power change.

Thermal tuning

All Koheras fiber lasers are equipped with thermoelectric temperature controllers (TECs).

The TECs stabilize the operation of the laser and makes it insensitive to environmental temperature fluctuations. The TECs also make it possible to tune the center wavelength by changing the operating temperature of the laser.

At standard room temperature (around 20-30°C or 68-86°F) the laser can be thermally tuned to an industry-leading 1000 pm.

Free space or fiber output in a robust packagingaeroGUIDE POWER fiber delivery

Per default, the HARMONIK systems come with free space output. If you need fiber coupling, we can propose an efficient coupling via our unique polarization-maintaining single-mode photonic crystal fiber that ensures high-power delivery.

Our aeroGUIDE fiber delivery patch cord is an excellent accessory for the HARMONIK.

The BOOSTIK HP system is delivered in a turn-key 19″ rack system and the HARMONIK is a tabletop module.


  • Greater than 7 W at 780 nm and 1560 nm
  • Greater than 4 W at 766 nm and 1533 nm
  • Sub-kHz linewidth
  • Ultra-low frequency and intensity noise
  • Wide wavelength tunability
  • Excellent beam quality, M2 < 1.1
  • Wide wavelength tunability
  • Temperature stabilized
  • Optional PM fiber delivery
  • Simple Plug and Play operation
  • Robust and maintenance-free

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Laser models

Model C7 E7
Wavelengths 766-780 nm

1533-1560 nm

766-780 nm

1533-1560 nm

Output power > 4 or > 7 W  > 4 or > 7 W
PM fiber delivery Optional Optional
RIN Ultra-low Low
Phase noise Low Ultra-low
Fast modulation Yes Yes


Model C7 E7
Center wavelengths 1) 766-780 nm / 1533-1560 nm 766-780 nm / 1533-1560 nm
Laser emission CW – inherently single frequency CW – inherently single frequency
Beam quality M2 < 1.1 M2 <1.1
SHG output power 2) > 4 W or > 7 W > 4 W or > 7 W
Fundamental output power 2) > 4 W or > 7 W > 4 W or > 7 W
Simultaneous operation total power 2) > 8 W or > 14 W > 8 W or > 14 W
Linewidth < 30 kHz / < 15 kHz < 0.4 kHz/ < 0.2 kHz
Max. phase noise -66dB((rad/√Hz)/m)@10Hz
RIN peak Appr. 1.0 MHz Appr. 0.7 MHz
RIN level 3) < -117 dBc/Hz @ peak
< -137 dBc/Hz @ 10 MHz
< -97 dBc/Hz @ peak
< -132 dBc/Hz @ 10 MHz
Long term stability (RMS, 1H@25°C) 4) < ± 2% < ± 2%
Optical S/N (50 pm res.) > 50 dB > 50 dB
Polarization / PER Linear > 20 dB Linear > 20 dB
Degree of polarization / DOP ≥ 30 ≥ 30
Min. thermal wavelength tuning range ± 175 pm ± 175 pm
Total thermal wavelength tuning range 500 pm 500 pm
Fast wavelength modulation range 16 GHz 16 GHz
Fast wavelength modulation Up to 20 kHz Up to 20 kHz
Typical beam diameter @ 1/e2 2 mm 2 mm

1) Center wavelength is selectable within the specified range. Please ask for options outside the range.
2) Output power depends on the center wavelength.
3) Shot noise-limited > 5 MHz.
4) After a 10-20 minute warm-up.

Mechanical / Electrical


Power supply requirements 100-240 VAC, 50-60 Hz
Digital interface Ethernet 10/100
Frequency modulation DB8 (male), differential 2 x 5 V
Monitor output Standard: Free-space
Optional:  Fiber FC/APC, 2.5 m
Dimensions (WxHxL) 173 x 62.5 x 240 mm3
Weight 6 kg

Technical drawings

Dimensions (WxHxL) 173 x 62.5 x 240 mm3
Weight 6 kg
HARMONIK technical drawing topview HARMONIK technical drawing sideview HARMONIK technical drawing frontview
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