Koheras HARMONIK

High-power frequency-converted laser system

SINGLE FREQUENCY, LOW NOISE
Ideal for cutting-edge quantum physics projects
The HARMONIK is a high-power frequency-converted laser system consisting of our popular low-noise Koheras fiber laser platform, BOOSTIK HP, in combination with our frequency converter
module, HARMONIK. The system gives you simultaneous power
operation at the fundamental and second harmonic frequency.
This maintenance-free laser system provides a superior lownoise single-frequency signal with a unique combination of narrow linewidth, excellent beam quality, and high output power.

Applications• Quantum computing• Quantum sensing• Gravimeters & inertial sensing• Metrology & optical clocks• Cold atom research & atom interferometry• Laser cooling and trapping• Laser-based metrology• Non-linear optics pump source(SHG, DFG, OPO)

KOHERAS HARMONIKHARMONIK is a high-power frequency-converted fiber laser system. Chose the E15 seeder for the lowest linewidthand phase noise, or the C15 for lowest RIN. Further linewidth and RIN reductions are available.

High output power and excellent beam quality

The output power of the HARMONIK systems depends on the wavelength with the highest obtainable output of 10 W.
The excellent beam quality, M2 < 1.1, is suitable for cutting edge quantum physics projects such as quantum sensing
and laser cooling and trapping, to mention a few.

Ideal for quantum optics

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

Power [w]

10W

1W

0,1W

300

400

500

600

700

800

Wavelength [nm]The graph shows the VIS wavelength capabilities of the HARMONIK. All lasers are pumped by our low-noise fiber lasers in theNIR (not shown), allowing the lasers to be locked to frequency references at either their fundamental or converted wavelengths.

Model

H31

H53

H78

H78

H81

H81

Wavelengths [nm]

317

532

770

780

813

840

Output power [W]>1>7>4>7>3>3

Linewidth [kHz]< 40< 40< 0.4< 0.4< 40< 40

FEATURES
Ultra-low noise

The HARMONIK systems offer an ultra-low phase noise as well
as low RIN. The RIN is preserved from the pump laser while thelinewidth is doubled.

Fast wavelength modulation

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

Features• Up to 10 W depending on wavelength• Sub-kHz linewidth• Ultra-low frequency and intensity noise• Wide wavelength tunability• Excellent beam quality, M2 < 1.1• Temperature stabilized• Optional PM fiber delivery• Plug and Play• Simple user operation• Robust and maintenance-free

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

Free-space or fiber output

As default, the HARMONIK systems come with free-space output.
If fiber coupling is needed, we can propose an efficient coupling
via our unique polarization-maintaining single mode photonic crystal fiber that ensures high-power delivery.
Our pre-angled fiber couplers are easy and fast to align. They
give a very high coupling efficiency, which does not decreasesignificantly over time, so it is possible to obtain a long term stablecoupling.

Rack system and table top

The BOOSTIK HP system is delivered in a turn-key 19″ rack systemand the HARMONIK frequency-conversion modules are supplied
as tabletop units that also fit a 19” rack-mount module.

Reliability
The Koheras range of single frequency
fiber lasers is based on telecom-grade fiber components and built to lastthousands of hours with no service ormaintenance.
With several thousand lasers installed inenvironments varying from fully climate
controlled national standards laboratories to the demanding environment on oilrigs and submarines, the Koheras line is
the most robust single-frequency laser
range on the market with an unmatchedreliability track record.

SPECIFICATIONS
OpticalModel

H31

H40

H53

H55

H63

H76

H78

H81

Center wavelength1) [nm]312-322392-405525-546547-560624-644765-769770-785789-845

Laser emission

CW - Inherently single frequency

Beam quality

M2 < 1.1

Output power2) [W]>1>1>7>1> 10>4> 4 or > 7>3Linewidth [kHz]< 40< 40< 40< 40< 20< 0.4< 0.4< 40

RIN peak [MHz]0.5-2.0

0.5-2.0

1.0-2.0

1.0-2.0≈1≈ 0.7≈ 0.7

0.5-2.0@ peak< -100< -100< -102< -102< -100

< -97

< -97

< -100@ 10 MHz< -140< -140< -140< -140< -140< -132< -132< -140

RIN level [dBc/Hz]

Long term stability (peak-peak, 1h @25°C)3) [%]< 10

Optical S/N (50 pm res.) [dB]

> 70

Polarization / PER [dB]

> 20

Min. thermal wavelength tuning range [pm]

± 70

± 90

± 120

± 120

± 140

± 175

± 175± 180

Total thermal wavelength tuning range [pm] 200

250

340

340

400

500

500500

Fast wavelength modulation range [GHz]> 16> 20> 20>8> 16> 16> 16> 16

Up to 20

Fast wavelength modulation [kHz]Pump unit(s) size for 19” rack system [U]

884

484

4

8

Number of frequency conversion modules4) 221111121) Center wavelength is selectable within the specified range.
2) Shot noise-limited > 5 Mhz.
3) After a 10-20 minute warm-up.
4) Delivered as tabletop module(s).

SPECIFICATIONS & DRAWINGSMechanical/Electrical
HARMONIK 1)
Power supply requirements [VAC, Hz]

100-240 VAC, 50-60 Hz

Digital interface

Ethernet 10/100

Monitor output

Standard: Free-space
Optional: 2.5m high power, single mode fiber delivery< 2 W: FC/APC; > 2 W: SMA905

Dimensions DFG/SFG (WxHxL) [mm]270 x 80 x 290

Dimensions red SHG (WxHxL) [mm]173 x 62.5 x 240

Dimensions green SHG (WxHxL) [mm]198 x 80 x 240

Weight 2) [kg]6-261) For the BOOSTIK HP system, please refer to the BOOSTIK HP datasheet.
2) Depending on the exact configuration.

HARMONIK DFG/SFG module

DRAWINGSHARMONIK red SHG module

HARMONIK green SHG module

All Koheras products are produced under our quality management system certified in accordance with the ISO 9001:2015.

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