Koheras HARMONIK

Koheras HARMONIK – high-power UV & VIS fiber lasers

Do you need light in the 300-900 nm range to address the wavelengths of e.g. rubidium, strontium, barium, or ytterbium? Get it with our new Koheras HARMONIK fiber laser systems!

The Koheras HARMONIK is a range of single-frequency mode-hop free and ultra-stable narrow-linewidth fiber lasers. They deliver high power and narrow linewidth light at the exact atomic transition you need for your quantum application.
If you are looking for high-quality light for quantum computing, sensing, metrology, and communications, try this new class of lasers. They have an inherently robust single-frequency design with low phase and intensity noise, high OSNR, and high optical power.

All with industrial reliability.

Key Features

Up to 10 W output power

Sub-kHz linewidth

Ultra-low frequency and intensity noise

Wide wavelength tuning

Excellent beam quality, M2 < 1.1

Fiber delivery option

Solutions

You can now get lasers at the following wavelengths:  

  • 780 nm, 840 nm, and 1064 nm for rubidium 
  • 317 nm, 813 nm, and 1064 nm for strontium 
  • 532 nm and 1762 nm for barium 
  • 399 nm, 556 nm, 638 nm, 770 nm, and 1064 nm for ytterbium 

Was your wavelength not on the list? Check our other wavelength capabilities and get in touch for other wavelengths.

Want to know more?

Get in touch with one of our Koheras laser experts and learn more

New wavelengths for your quantum research 

See below for VIS wavelength capabilities of the HARMONIK. All lasers are pumped by our low-noise fiber lasers in the NIR (not shown), allowing the lasers to be locked to frequency references at either their fundamental or converted wavelengths.

Industrial reliability

We know that uptime is important to you. Our Koheras fiber lasers are inherently stable. They are reliable, alignment-free, and maintenance-free. You can mount them in a rack or place them upside down, they just do their job. Others even trust our Koheras lasers enough to send them into space. And should you need support, we have a team of dedicated engineers ready to help.  

15,000 Koheras lasers have been installed in demanding industrial applications for decades. Now, they are ready to assist you in your quantum research.  

Unique fiber delivery system 

Do you want to mount the laser system in a rack? No problem. With the unique fiber delivery system, you can get light wherever you want. The fiber delivery solution handles high power, preserves the low-noise laser properties, and delivers single-mode light at all wavelengths.  

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 500 pm.

More details on noise and linewidth

If you want more details about phase noise, spectral linewidth, frequency stability, or how to wavelength tune your Koheras laser, we have some application notes for you.

Laser phase noise is a frequency-domain view of the noise spectrum around the laser signal. Read more about phase noise in single-frequency lasers.

Spectral linewidth is a measure of the spectral content of the laser light. Read more about linewidth measurement methods.

The laser’s frequency stability is often described in terms of its spectral linewidth. However, this term lacks detail about the laser frequency noise which is often critical in laser applications. Read the analysis of the laser frequency stability using beat-note measurement.

The wavelength of the laser is controlled by the temperature and strain of the DFB cavity. Learn how to tune your Koheras laser.

Specifications

Choose model:
H31
H40
H53
H55
H63
H76
H78
H81
Center wavelength1) [nm]
312-322
392-405
525-546
547-560
624-644
765-769
770-785
789-845
Laser emission
CW
CW
CW
CW
CW
CW
CW
CW
Beam quality
M2 < 1.1
M2 < 1.1
M2 < 1.1
M2 < 1.1
M2 < 1.1
M2 < 1.1
M2 < 1.1
M2 < 1.1
Output power2) [W]
> 1
> 0.5
> 7
> 1
> 10
> 4
>4 or >7
> 3
Linewidth [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
RIN level @ peak [dBc/Hz]
< -100
< -100
< -102
< -102
< -100
< -97
< -97
< -100
RIN level @ 10 MHz [dBc/Hz]
< -140
< -140
< -140
< -140
< -140
< -132
< -132
< -140
Long term stability (peak-peak, 1h @25°C)3)  [%]
< 10
< 10
< 10
< 10
< 10
< 10
< 10
< 10
Optical S/N (50 pm res.) [dB]
>70
>70
>70
>70
> 70
> 70
> 70
>70
Polarization / PER [dB]
> 20
> 20
> 20
> 20
> 20
> 20
> 20
> 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
500
500
Fast wavelength modulation range [GHz]
> 16
> 16
> 20
> 20
> 8
> 16
> 16
> 16
Fast wavelength modulation [kHz]
Up to 20
Up to 20
Up to 20
Up to 20
Up to 20
Up to 20
Up to 20
Up to 20
Pump unit(s) size for 19” rack system [U]
 8
 8
 4
 4
 8
4
 4
 8
Number of frequency conversion modules4)
2
2
1
1
1
1
1
2

1) 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 modules(s).

H31
H40
H53
H55
H63
H76
H78
H81
Weight1) [kg]
6-26
6-26
6-26
6-26
6-26
6-26
6-26
6-26

1) Depending on the exact configuration.

HARMONIK DFG/SFG module

HARMONIK red SHG module

HARMONIK green SHG module

H31
H40
H53
H55
H63
H76
H78
H81
Power supply requirements
100-240 VAC, 50-60 Hz
100-240 VAC, 50-60 Hz
100-240 VAC, 50-60 Hz
100-240 VAC, 50-60 Hz
100-240 VAC, 50-60 Hz
100-240 VAC, 50-60 Hz
100-240 VAC, 50-60 Hz
100-240 VAC, 50-60 Hz
Digital interface
Ethernet 10/100
Ethernet 10/100
Ethernet 10/100
Ethernet 10/100
Ethernet 10/100
Ethernet 10/100
Ethernet 10/100
Ethernet 10/100
Monitor output, standard
Free-space
Free-space
Free-space
Free-space
Free-space
Free-space
Free-space
Free-space
Monitor output, optional 1)
< 2 W
FC/APC
FC/APC
FC/APC
FC/APC
FC/APC
FC/APC
FC/APC
FC/APC
> 2 W
SMA905
SMA905
SMA905
SMA905
SMA905
SMA905
SMA905
SMA905

1) 2.5 m high power, single mode fiber delivery