NKT Photonics Koheras HARMONIK Manual de usuario

Koheras HARMONIK

Fiber Coupler Installation Guide

Item# 800-634-01

General overview

Warning: Koheras HARMONIK lasers are Class 4 lasers. Before any operation is attempted, ensure the procedures and notices

within this Installation Guide and the hazard labels on the product are read, noted, and adhered to. In addition, make sure to follow

all safety recommendations listed in the Koheras HARMONIK Safety, Handling and Regulatory Information document shipped with

your laser. If in doubt, consult your laser safety officer.

Warning: Do not install the fiber coupler with the laser powered on. Ensure power to the laser is removed before proceeding with

the installation.

Warning: Use of controls or adjustments or performance of procedures other than those specified herein and in the document

Koheras HARMONIK Product Guide may result in hazardous radiation exposure.

Using four attachment bolts and washers, the fiber coupler

flange adapter is bolted onto the front panel of the

HARMONIK module. An iris diaphragm is used to coarsely

align the adapter with the output beam. Coarse alignment

is achieved by using a power meter to measure the

transmitted power and then maximize it by laterally shifting

the adapter. This ensures the adapter is accurately

centered on the output beam. Once the coarse alignment

is completed, the fiber coupler is inserted and fixed to the

flange adapter and then finely adjusted.

Installation environment

It is important that the installation environment is clean and

free from dust or other contaminants. Further, the output

windows should be free from any dust particles before

installation of the fiber couplers.

Safety precautions

Align both the fundamental and second harmonic laser

apertures using an appropriate beam dump. To further

prevent damage and accidental exposure to personnel,

ensure the beam path is safely contained and known.

All nearby personnel must wear suitable clothing and be

aware of the laser operations and the danger involved.

Item list

1Koheras HARMONIK

2aeroGUIDE Power cable

3Flange adapter

4Four M2x6 hex screws with washers

5Fiber coupler for second harmonic and/or fundamental

output

Tools required

1Adjustable iris diaphragm

250HD-15 hex screw driver

39D-12 screw driver

4Eccentric key

5Power meter

Removal of protection caps

To prevent contamination, the fiber couplers come with

dust protection caps. Remove the caps before continuing

the installation.

Koheras HARMONIK Fiber Coupler Installation Guide

Revision 1.0 01-2022 W-10456

Koheras HARMONIK

Fiber Coupler Installation Guide

Step 1: Mount the optical flange adapter

aTurn off laser power.

bInsert the four M2x6 mounting screws with washers through the

holes in the flange of the adapter.

cMake sure the adapters are orientated with the fundamental/SHG

output as shown with respect to the radially arranged pin screws.

dSlightly tighten the mounting screws using a 50HD-15 hex key or

driver.

Step 2: Align the adapter

aInsert the iris diaphragm into the flange adapter.

bMinimize the iris diaphragm aperture.

cSet the laser to the lowest-possible power and turn it on.

dMeasure the transmitted output power using a suitable power

meter.

eMaximize the transmitted power by laterally moving the flange

adapter.

fTighten the four mounting screws while taking care not to move

the flange adapter from the maximum power position.

gRemove the iris diaphragm.

hMeasure the free space output power for a later comparison to the

fiber coupled power to calculate the coupling efficiency.

Step 3: Mount the fiber coupler

aInsert the fiber coupler into the adapter flange.

bMake sure the fiber coupler has the same orientation as depicted

in the figure on the right. The flat surface has to be aligned

horizontally - perpendicular to the laser output polarization.

cTighten the three tapered pin screws to fix the fiber coupler in the

adapter flange.

“pin screws”

Koheras HARMONIK

Fiber Coupler Installation Guide

Step 4: Connect the external DC power supply

aInsert the fiber into the fiber coupler’s receptacle. The fiber

connector has a thin notch mark indicating its orientation.

bMake sure the orientation of the fiber cable is as depicted.

Orientate the thin notch mark to exactly the “3 o’clock” position,

before tightening the fiber connector nut.

cGently tighten the grub screw to fix the fiber ferrule in the

receptacle.

dConnect the fiber’s output end to a power meter.

“3 o’clock”

“fiber connector

nut”

“grub screw”

Koheras HARMONIK

Fiber Coupler Installation Guide

Step 5: Adjust the coarse tilt

aLoosen the three tilt locking screws.

bTurn the tilt adjustment screws in sequence over a wide range in

both directions while observing the power meter.

cIf there is no measurable light coupled into the fiber while turning

the adjustment screws, perform steps “d” to “f”, otherwise go to

step “g”.

dLoosen the two grub screws holding the collimator lens.

eInsert the eccentric key and rotate it until the collimator lens is

closest to the fiber end. This orientation is where the white

indicator on the eccentric key points towards the fiber end as the

white arrow shows. From this position, rotating in either direction

moves the lens away from the fiber end.

fAs was done in step “b”, turn the tilt adjustment screws in

sequence until the signal is found on the power meter.

gOptimize the tilt adjustment for maximum power coupled into the

fiber.

“grub screws”

“tilt adjustment screws”

“tilt locking screws”

Koheras HARMONIK

Fiber Coupler Installation Guide

Step 6: Adjust the focus

aWhile monitoring the power meter, rotate the eccentric key until

the maximum signal is attained.

bIteratively repeat steps “5g” (tilt optimization) and “6a” (focus

optimization) until the maximum signal cannot be increased

further.

cTighten the two grub screws holding the collimator lens.

Step 7: Adjust the fine tilt

aOnce more, check if you can enhance coupling efficiency by using

the three tilt adjustment screws.

bFinally, lock the tilt adjustment by tightening the three tilt locking

screws. Besides their locking function, the tilt locking screws can

also adjust the fine tilt.

cWhile tightening the first two tilt locking screws, the power meter

signal typically drops significantly. However, when tightening the

third screw, the maximum signal should recover.

Step 8: Final check

aWhile observing the fiber output power, gently press against the

cladding stripper of the fiber from the side.

bWhen pressing against the cladding stripper in different directions,

the signal normally drops.

cRelease the cladding, the signal should recover to its maximum

value.

dIn case the signal increases while pressing against the connector

in a specific direction, the adjustment is not at its optimum. The

corresponding locking screw has to be fine tuned further, until the

fiber output power decreases symmetrically in each push

direction.

“grub screws”

“tilt locking screws”

“cladding”

Koheras HARMONIK

Fiber Coupler Installation Guide

Support

Web https://www.nktphotonics.com/lasers-fibers/

support/technical-support-and-customer-service/

Shipping Address NKT Photonics A/S

Blokken 84

3460 Birkerød

Denmark

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