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External cavity stabilization

External cavity stabilization

The lasers can be locked to an external cavity to obtain lower low-frequency

phase noise by using the Pound-Drever-Hall technique.

Figure 18

depicts a

general layout of the devices in a Pound-Drever-Hall configuration used with the

laser.

Figure 18

The laser used in a Pound-Drever-Hall configuration

Setting up external

cavity stabilization

Follow the steps below to configure and enable external cavity locking:

1. Enable external modulation (see

“Modulation Source” on page 74

2. Configure the wavelength modulation input as DC coupled

(see

“Modulation

Coupling” on page 75

)

3. Configure the laser to operate in narrow modulation range (see

“Modulation

Range” on page 76

4. Turn wavelength modulation on (see

“Turning on wavelength modulation” on

page 77

5. Set the update interval (see

“Integrating update interval” on page 76

Once enabled, the laser constantly adjusts its wavelength so that the Pound-

Drever-Hall loop results in a 0 V differential applied at the Wav/- input

pins.

When using external cavity stabilization, differential input is preferred to achieve

the lowest noise performance.

Содержание Koheras ADJUSTIK HP

Страница 1: ...Item 800 611 01 Koheras ADJUSTIK HP PRODUCT GUIDE Low Noise Single Frequency Laser System...

Страница 2: ...ludes the following NKT Photonics lasers Koheras ADJUSTIK Low Noise Single Frequency Laser System Koheras ADJUSTIK HP High Power Low Noise Single Frequency Laser System Koheras ADJUSTIK Product Guide...

Страница 3: ...ion Note The paper copy of this document is included with your laser however it can also be downloaded from https www nktphotonics com lasers fibers support product manuals Terminology This guide may...

Страница 4: ...s accessory descriptions laser part numbers and miscellaneous procedures supporting the laser operation and installation Added information and safety notices Lasers are highly dangerous devices that c...

Страница 5: ...nel style 21 Terminology 21 Features and Options 22 High power variants 22 Theory of operation 23 Safety 23 Module variants 24 Part numbers 24 Center wavelength 24 Output power 24 Tuning types 25 Fron...

Страница 6: ...dulation 37 Configuring wavelength modulation 37 Wavelength signal 38 Differential input 39 Single ended to differential 39 Singled ended input 39 Wavelength to AGND 41 Differential output 42 Waveleng...

Страница 7: ...hdog timer 54 Display backlight 54 IP Address 55 Emission button 55 4 Communicating with the Laser 57 CONTROL software 57 Installing CONTROL software 57 Connecting the laser to a CONTROL PC 57 Etherne...

Страница 8: ...tor 73 Emission button 73 CONTROL settings 74 Wavelength modulation 74 Amplitude modulation 77 Ethernet 78 Watchdog 79 Clock 80 View 81 CONTROL menu items 81 Serial monitor 82 Application log 82 CONTR...

Страница 9: ...ng the trigger input or output 94 Input trigger 94 Output trigger 94 Connecting the optical output 95 Cleaning of fiber facets 96 Cleaning tools 96 Appendices A Specifications 99 B Service and support...

Страница 10: ...10 E Part numbers 113...

Страница 11: ...menu items 49 Table 9 CONTROL panels and menu items 69 Table 10 Power specifications 93 Table 11 Koheras ADJUSTIK optical specifications 99 Table 12 Koheras ADJUSTIK HP optical specifications 100 Tab...

Страница 12: ...12...

Страница 13: ...signal 42 Figure 14 X15 variant wavelength modulation response 43 Figure 15 E15 C15 Y10 variant wavelength modulation response 44 Figure 16 Differential input for amplitude modulation 45 Figure 17 Si...

Страница 14: ...gure 43 Internal generator waveform selection Type 75 Figure 44 Turning on wavelength modulation 77 Figure 45 Power and current mode controls 77 Figure 46 Internal amplitude modulation settings 78 Fig...

Страница 15: ...15 Figure 63 Lint free wipe example 96 Figure 64 Example of a fiber cleaning cartridge 96 Figure 65 Warranty seal 103 white...

Страница 16: ...16...

Страница 17: ...2 Connecting a PC to the laser using Ethernet 59 Procedure 3 Turning on the laser using CONTROL 63 Procedure 4 Turning on the laser using the front panel controls 65 Procedure 5 Relocating panels 70 P...

Страница 18: ...18...

Страница 19: ...s Laser Description on page 21 Module variants on page 24 Laser features on page 28 Miscellaneous on page 30 Optical interface on page 31 Laser Control on page 32 Status LEDs on page 33 Chassis labels...

Страница 20: ...20...

Страница 21: ...e specified All variants are designed with distributed feedback fiber laser technology and for the ADJUSTIK2 center wavelengths can be specified from either 1535 to 1580 nanometers or 1030 to 1120 nan...

Страница 22: ...ignal applied to the pins modulates the output wavelength Modulating the output wavelength can obtain improved stabilization as compared to the free running wavelength specification Output fiber The s...

Страница 23: ...table over the entire operating frequency band of the laser Safety Warning The lasers are rated as Class 3B and Class 4 lasers and are therefore hazardous Before turning on the laser ensure to read an...

Страница 24: ...m either 1545 to 1565 nm or 1060 to 1075 nm2 Output power Depending on the module type the output power varies between greater than 10 mW and up to and including 2 W The output power is generally fixe...

Страница 25: ...ation and acoustic pickup Note Wide thermal tuning is the default option for the lasers Piezo tuning The internal laser modules support fine fast wavelength modulation using Piezo tuning For further i...

Страница 26: ...and disables emission enables emission only if the system meets safety and operational parameters Key switch the key switch must be ON to enable emission Remove the key to prevent unauthorized laser...

Страница 27: ...viding pins for wavelength input output amplitude modulation input and trigger signals Ethernet 10 100 Mbps BASE T Ethernet port for IP connectivity to the laser External Bus Female DB 15 pin connecto...

Страница 28: ...d using a thermal tuning technique that changes the temperature of the laser s fiber The fiber laser is mounted under tension on a substrate When the temperature of the substrate changes the laser cav...

Страница 29: ...cy phase noise to an ultra low level It requires that the output is stabilized using an external cavity circuit Refer to External cavity stabilization on page 46 for details of the implementation Ampl...

Страница 30: ...n page 94 High temperature shutdown To prevent thermal run away when the laser temperature exceeds 65 C the emission is automatically turned off The high temperature shutdown feature uses the thermal...

Страница 31: ...er fiber patch cords with FC APC connectors FC APC pig tail or connector adapters FC APC adapter or SC APC adapter Polarization maintaining output The output fiber of the laser is polarization maintai...

Страница 32: ...ications For further information regarding the SDK refer to the software and drivers link at NKTP s support webpage https www nktphotonics com lasers fibers support technical support and customer serv...

Страница 33: ...there is no emission from the system Alternatively firmware is being uploaded to the system main control board During firmware upgrade the interlock cannot be reset and no emission from the system is...

Страница 34: ...umber of labels on it that indicate hazards regulatory or manufacturing information The labels are located on the panels described in Table 5 with the panels shown in Figure 5 and Figure 6 Figure 5 To...

Страница 35: ...showing the emission specifications of the laser Laser Radiation Warning Top Safety information alert indicating this area of the laser is near a source of dangerous laser emissions Laser Aperture Fib...

Страница 36: ...Chassis labels 36...

Страница 37: ...et Therefore the E15 s performance is only guaranteed at the nominal maximum output power setting Fast wavelength modulation If the fast wavelength modulation option is included with the laser the out...

Страница 38: ...on For CONTROL see For SDK see External wavelength modulation Sets wavelength modulation to external signal mode page 74 page 84 Internal function generator Sets wavelength modulation to internal func...

Страница 39: ...e wavelength modulation setting when it is not in use Single ended to differential The circuit shown in Figure 8 is an example of how to generate a differential signal from a single ended input In thi...

Страница 40: ...ifferential 2x5 Vpp input Figure 9 Single ended input signal with 2 5 V Figure 10 shows the Wavelength pin connected to the same potential as the common mode voltage of the Wavelength signal the optic...

Страница 41: ...to AGND and the Wavelength signal is modulated between 0 and 5 V as shown in Figure 11 the optical output is modulated above its thermally controlled wavelength Figure 11 Single ended input signal wi...

Страница 42: ...xternal reference signal that for example uses the Pound Drever Hall technique In this mode the laser adjusts its wavelength so the differential error signal level on the Wavelength input leans toward...

Страница 43: ...Figure 14 shows the measured frequency response of an X15 variant for both wide and narrow ranges Wide 600 MHz tuning at low frequencies with a smooth roll off to a 3 dB cut off at 300 Hz Narrow 30 M...

Страница 44: ...n generator When the output power is modulated the maximum level cannot exceed the configured output power setpoint Amplitude Signal The Amplitude pins of the electrical interface are a differential i...

Страница 45: ...setpoint 5 V separation Figure 16 Differential input for amplitude modulation Alternatively Figure 17 shows the Amplitude negative pin connected to ground with the positive branch connected to a signa...

Страница 46: ...ng 1 Enable external modulation see Modulation Source on page 74 2 Configure the wavelength modulation input as DC coupled see Modulation Coupling on page 75 3 Configure the laser to operate in narrow...

Страница 47: ...G THE LASER This section describes how to manage and operate the laser and includes the chapters Front Panel Menu on page 49 Communicating with the Laser on page 57 Turning ON the Laser on page 61 Usi...

Страница 48: ...48...

Страница 49: ...lay on page 51 W1 Modulation Enables external or internal wavelength modulation W1 modulation on page 51 W1 mod Gain Gain adjustment for the wavelength modulation signal W1 mod Gain on page 52 W1 mod...

Страница 50: ...button to exit a sub menu and return to the top or parent menu Modifying parameter values Press the enter button multiple times to select a digit of a parameter s numeric field When the digit is flas...

Страница 51: ...wavelength or relative the offset from the standard wavelength Changing between absolute and relative with this menu affects both the Top menu and Wavelength menu Absolute displays the actual wavelen...

Страница 52: ...odulation source used for wavelength modulation The source can be set to either Internal internal generator or External signal applied to the wavelength modulation pins Figure 24 Wavelength modulation...

Страница 53: ...e menu Figure 27 sets the operation mode of the laser to either constant Power mode or constant Current mode Refer to Operating mode on page 29 for further information on setting the mode Figure 27 Op...

Страница 54: ...nabled the laser monitors the communications link When the laser detects that the link is broken the watchdog timer begins to countdown If the timer expires before the link is restored emission is shu...

Страница 55: ...d cau tions in this guide and in either the Koheras ADJUSTIK Safety Handling and Regulatory Information or Koheras ADJUSTIK HP Safety Handling and Regulato ry Information document before continuing Ca...

Страница 56: ...Menu items 56...

Страница 57: ...capable of controlling configuring and monitoring the laser Installing CONTROL software After downloading the CONTROL installer software onto a PC CONTROL PC double click the installer and follow the...

Страница 58: ...ing on Windows Start Programs NKT Photonics CONTROL or double clicking the CONTROL shortcut on the desktop 5 The CONTROL window opens Click on the Connect button in the left side of the window 6 CONTR...

Страница 59: ...ddress on page 55 Protocol Select either UDP or TCP TCP is the default and recommended Host Port Enter a TCP or UDP port the PC will use for communications with the laser The default value is 10001 Sy...

Страница 60: ...onfigured port 1 Highlight the port and Click the delete button or 2 Click the edit button 3 Click Save when finished Edit button Delete button From the Connect drop down menu click on the Ethernet co...

Страница 61: ...nimum the door switch interlock 2 The laser is connected to a PC through either a USB or Ethernet connection and the PC has CONTROL installed on it and executing according to the procedures in Communi...

Страница 62: ...y This increases noise and may cause the laser beam to scatter causing damage or injury You must always reduce the risk of BR into the laser For example in a bulk optic system ensure all reflective op...

Страница 63: ...he ON position NOTE If the key switch is set ON and the interlock LED on the front panel is still amber turn the key back to OFF and then ON again This resets the interlock as long as the interlock ci...

Страница 64: ...the Wavelength offset control To adjust the wavelength click hold the slider to change its position b Alternatively enter the wavelength in nanometer units by typing the value into the offset input bo...

Страница 65: ...on of the bus chain s last connected device s Note if the laser is operating in standalone mode place the bus defeater on the External bus connector b Door interlock message the message is displayed w...

Страница 66: ...age the emission wavelength and power level is displayed 7 Interlock opened message this message will be displayed if there is a break anywhere in the interlock circuit Emission will be disabled and t...

Страница 67: ...ust the wavelength b Adjust power to modify the output power use the selection dial and enter button to select the Power menu item In the menu use the selection dial and enter button to adjust the pow...

Страница 68: ...Enabling and disabling emission 68...

Страница 69: ...ol and a CONTROL settings menu Status panel on page 72 Menu Items Four drop down menus with multiple functions CONTROL menu items on page 81 Quick Connect Provides a button when clicked scans all avai...

Страница 70: ...in window Action 1 Left click hold the top title bar of a panel 2 While holding the left mouse button down drag the panel to another position in the main window 3 When the background turns blue in a n...

Страница 71: ...menu and then click on the COM port your laser is using to connect the PC to the laser The Control and Status panels are displayed once the laser connects to CONTROL See Connecting the laser to a CON...

Страница 72: ...e 39 Status panel Status indicators The panel includes the following indicators Interlock Indicates the status of the interlock circuit ON Green Interlock circuit closed ON Red Interlock circuit open...

Страница 73: ...mod button and indicator Am mod button The Amp mod button turns the amplitude modulation ON or OFF Amp mod Indicator GREEN amplitude modulation is ON GREY amplitude modulation is OFF Note Amp mod butt...

Страница 74: ...gnal used to modulate the wavelength is selectable Click on the Source drop down menu to select one of three source modes Internal Figure 41 wavelength is modulated using the laser s internal function...

Страница 75: ...age 37 Figure 41 Wavelength modulation internal source Figure 42 Wavelength modulation external source Modulation Type internal mode If the Modulation source is set to Internal you can set the signal...

Страница 76: ...nternal modulation from the wavelength modulation pins of the laser To output the signal from the pins set the Modulation type to Internal and the Signal output selector to Enabled To disable the outp...

Страница 77: ...Integrating Update Interval The integrating update interval sets the update interval for a software integrating function The function is only available on X15 systems with Coupling configured as DC an...

Страница 78: ...s settings for the laser Ensure that the IP address of the laser is on the same subnet as the computer used to control it System Port The System port defines what port number the laser should use for...

Страница 79: ...s not configurable but unique for every laser Figure 47 Ethernet setting Watchdog The laser features a watchdog for monitoring of USB or Ethernet communication If CONTROL is disconnected from the chas...

Страница 80: ...settings from a connected PC Date Displays the system date in the format DD MM YYYY Time Displays the system time in 24 hour format HH MM SS Set to computer clock Click the Set button to update the sy...

Страница 81: ...nu items There are four drop down menus in the main control window as highlighted in Figure 51 Click on the items in the menu to reveal the drop down menus Figure 51 Menu items Toggles whether to disp...

Страница 82: ...nel click on the upper right corner X Application log In addition to the Serial Monitor the Application Log panel is useful for debugging serial communications The panel displays time stamps for COM p...

Страница 83: ...e scaled in either mW or dBm Figure 54 Operating mode set to power Note For C15 and Y10 variants the power is fixed and cannot be adjusted For these module variants a power slider control is unavailab...

Страница 84: ...CONTROL Control panel 84...

Страница 85: ...85 SECTION 3 INSTALLING THE LASER This section provides information on how to install the laser and includes the chapters Mechanical Installation on page 87 Connecting the Laser on page 91...

Страница 86: ...86...

Страница 87: ...mperature fluctuations Temperature changes and vibrations may affect the laser s operation and result in abnormal operation Caution For reliable operation the laser should not be exposed to corrosive...

Страница 88: ...osition the laser while the other fastens it to the rack Figure 56 Image of the laser rack mounted Placing the laser on a table or shelf For installations where the laser is placed on a level surface...

Страница 89: ...Appendix A details the required ambient operating and storage environment specifications Warning A Koheras ADJUSTIK laser is either a Class 3B or Class 41 laser prod uct and its operation facility and...

Страница 90: ...Placing the laser on a table or shelf 90...

Страница 91: ...oor it opens the interlock circuit which turns off laser emissions Simplified Interlock operation The interlock circuit in functional terms is a closed circuit loop When the loop is broken the laser c...

Страница 92: ...ion Do not short circuit the Interlock input Short circuiting the interlock cir cumvents safety regulations and NKT Photonics does not take liability for any in juries or damage caused by doing so Cau...

Страница 93: ...ications are listed in Table 10 Table 10 Power specifications Action 1 Install a switch that opens when the door accessing the laser installation enclosure is opened The switch must comply with safety...

Страница 94: ...r logic input output signal as part of the Modulation connector see Table 18 The trigger signal can be used to either initiate or indicate laser emission Input trigger When set as an input a positive...

Страница 95: ...the connec tor Either clean the connector or contact NKT Photonics support if a replacement is necessary The fiber and its connectors are inspected and sealed in a clean environment before shipping F...

Страница 96: ...h coaxial and oblique illumination is useful in exposing any contaminants or defects in the facet Further rotating the fiber while under illumination may be necessary to discover irregularities often...

Страница 97: ...ude Appendix A on page 99 Specifications Appendix B on page 103 Service and Support Appendix C on page 105 Interface Pin Assignments Appendix D on page 107 CONTROL Installation Appendix E on page 113...

Страница 98: ...98...

Страница 99: ...0 3 20 kHz 355 10 Hz 36 100 Hz 3 5 20 kHz Peak RIN MHz 0 7 0 7 1 0 1 5 RIN level Peak 10 MHz dBc Hz 100 135 100 135 120 140 105 140 Optical S N 50 pm res dB 50 typ 55 50 typ 55 65 typ 70 65 typ 70 Mi...

Страница 100: ...ng Wavelength Tuning Range pm 3 3 Relative to the center wavelength at room temperature If the laser case temperature is outside the range of approximately 10 50 C the range of detuning from the cente...

Страница 101: ...1010 1 2010 Safety requirements for electrical equipment for measurement control and laboratory use Part 1 General requirements EN 61326 1 2013 Electrical equipment for measurement control and laborat...

Страница 102: ...102...

Страница 103: ...ser contains electro static discharge ESD sensitive components To avoid permanent ESD damage use ESD protection precautions when han dling the laser Always connect the laser s earth point to a ground...

Страница 104: ...act NKT Photonics through our support website below Support website 1 Go to https www nktphotonics com lasers fibers support technical support and customer service 2 Scroll down and click or press 3 S...

Страница 105: ...e Positive branch of differential input output for amplitude modulation 8 AGND 0 volt analog ground for modulation signals 9 Wavelength Positive branch of differential input output for wavelength modu...

Страница 106: ...en the interlock circuit is closed and has been reset This signal can be used to control safety related precautions on the External Bus 5 6 13 14 GND 0 volt ground 7 8 15 12 V 12 volt supply voltage f...

Страница 107: ...tps www nktphotonics com lasers fibers support software drivers Follow the steps in Procedure 7 Procedure 7 Installing CONTROL Action 1 On the PC launch the installer package and then click the Run bu...

Страница 108: ...rowse button Click Next to continue 4 Uncheck the components you do not require By default all components will be installed Click Next to continue 5 Read the End User License Agreement and select I ac...

Страница 109: ...with program short cuts Use the default name or enter a new name for the folder Click Next to continue 7 Check the box to create a desktop shortcut to access Control Click Next to continue 8 Check the...

Страница 110: ...for the installation Note a normal install should only take a few seconds 11 Click Next to install the UART drivers for the PC USB port 12 Read the End User License Agreement and select I accept this...

Страница 111: ...s will be installed 14 The Silicon Labs drivers is installed successfully Click Finish to end the installation wizard 15 CONTROL is now installed Check the Run box to launch CONTROL when the Finish bu...

Страница 112: ...Installing CONTROL 112...

Страница 113: ...TIK E15 40 mWi i Minimum output 30 of the maximum K8221 Koheras ADJUSTIK C15 10 mWii ii Fixed K8227 Koheras ADJUSTIK X15 22 5 mW K8220 Koheras ADJUSTIK Y10 10 mWii K82223 Koheras ADJUSTIK HP E15 200 m...

Страница 114: ...114 2...

Страница 115: ...Koheras ADJUSTIK Product Description Release 1 0 04 2021 W 10456...

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