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PD - Photodiode
P - P type volume absorber for short pulse lasers

PF - volume absorber for short pulses and high average powers

HE/HE1- volume absorber for high energy pulses
EX - Excimer type, volume absorber
PE - pyroelectric metallic or black absorber
BB - broadband surface absorber, high power density
LP1 - broadband surface absorber for highest power density
BF - very high damage threshold, long pulses
FS - Fused silica window close to detector for divergent beams

Note:

For more detailed and exact specifications, see the
latest Ophir Laser Measurement Instruments Catalog.

Absorber

Type

Max Energy Density J/cm²

Pulse Length

10ns

1µs

300µs

P

10

10

10

HE/HE1

3

5

15

BB

0.3

0.5

3

LP1

0.09

0.5

10

EX

0.8

0.9

7

PE, Metallic

PE, BB

PE-DIF

PE BB-DIF

0.2

0.5

1

3

0.5

0.5

2

3

4

1

20

10

Maximum Energy Densities for Various Absorbers

(Single pulse).

Table 6.

Graph 4.

Pulsed Laser Damage Threshold for Thermal Sensors

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Содержание vega

Страница 1: ...LASER POWER ENERGY METER USER MANUAL VEGA VEGA OPHIR OPTRONICS VEGA www ophiropt com photonics...

Страница 2: ...General Description 21 3 2 Smart Connectors 22 3 3 Soft Keys 22 3 4 Power Up and Shut Down 24 3 5 Vega Functions which are Independent of Sensor Type 25 3 6 Hardware Functions 28 3 7 GUI and Keypad Se...

Страница 3: ...ctric Photodiode Energy Sensors 68 6 2 Selecting Settings from the Vega Screen 69 6 3 Startup and Configuration of Defaults 73 6 4 Energy Power or Exposure Measurement 75 6 5 Measuring Repeating Pulse...

Страница 4: ...ile or RP Sensors 91 9 2 Calibration of Photodiode type Sensors 96 9 3 Calibration of Pyroelectric type Sensors 98 9 4 Error Messages 101 9 5 Troubleshooting 102 9 6 Maintenance 104 Chapter 10 Vega Sp...

Страница 5: ...ses smart connector technology Just connecting the sensor configures and calibrates the instrument This manual tells you what you need to know to make full use of the Vega for all your laser measureme...

Страница 6: ...ge as indicated by the legend above each key See Figure 2 2 To connect sensor to the Vega Display Insert the 15 pin D type connector of the measuring sensor cable into the socket marked Head Input on...

Страница 7: ...2 2 1 Turning on and off To switch the Vega on Briefly press the on off switch Figure 2 2 The unit will switch on and the display will appear Note To work with a sensor the sensor must be plugged in b...

Страница 8: ...Options To zero instrument 1 Disconnect the sensor turn off then on again Head Disconnected will be displayed 2 Make sure instrument is not in an electrically noisy environment and is undisturbed 3 Pr...

Страница 9: ...screen without a sensor connected or in Instrument screen with sensor connected 2 With the navigation keys go to Language 3 Press the Enter key and with the navigation keys choose Japanese written in...

Страница 10: ...ress Done 2 3 Thermal Sensors 2 3 1 Use of Vega with thermal type sensors Most Thermopile sensors have somewhat different absorption at different wavelengths In order to compensate for this each senso...

Страница 11: ...elength as the startup default press Save before exiting If the wavelength you want is not among the wavelengths in the six wavelengths listed and you want to change or add a wavelength see step 3 3 C...

Страница 12: ...onfigure and enter 2 With the navigation keys select Startup mode Press the Enter key and select Power or Energy as the startup mode Press the Enter key again to exit If you want this mode to be perma...

Страница 13: ...0 Otherwise there is a risk of damaging the absorber To simulate an analog needle display on the Vega 1 Select Menu and enter Select Needle and enter The display will now show a simulated analog needl...

Страница 14: ...measurement screen To use the Vega to measure Laser energy 1 Verify that the display shows Energy in the upper right hand side of the display 2 If the display shows Power and units of W or mW etc then...

Страница 15: ...ower measurement screen select Laser and enter Move to the wavelength you wish to change or add Press the right navigation key 2 Using the up down navigation keys to change each number and the right l...

Страница 16: ...and choose the manual power range you wish to be the default or choose autorange or dBm 5 Select Average and set the average over period over or leave the default NONE 6 Select Laser to choose the st...

Страница 17: ...t to the main measurement screen 2 5 Pyroelectric Sensors 2 5 1 Zeroing Instrument against Sensor For the most accurate calibration you must zero the pyroelectric sensor against the Vega it is being u...

Страница 18: ...wavelength If you want this one to be the startup wavelength press Save before exiting 2 5 4 Setting Startup Configuration 1 Turn on the Vega with the sensor connected select Menu and enter Select Con...

Страница 19: ...age Power Measurement Warning Do not exceed maximum sensor limits for power energy power density and energy density as listed in Table 5 and Table 6 in Chapter 10 Otherwise there is a risk of damaging...

Страница 20: ...if you want that range to be the startup default Press Exit 3 If the sensor triggers from ambient vibration or noise without a laser signal raise the threshold level as follows Select Threshold enter...

Страница 21: ...20 3 To reset the reading to zero before another reading press Reset 4 To return to the main screen and press Energy...

Страница 22: ...o set scales or it can manual range if you wish It will remember what mode you were using before you turned it off and will return to that mode when turned on You can zoom in on the present reading or...

Страница 23: ...no longer necessary as the Vega will recognize when a sensor has been disconnected and will restart itself See section 3 6 5 for details When no sensor is plugged in and the Vega is turned on the dis...

Страница 24: ...ns move to the next active item rightwards and leftwards The up and down buttons move to the next active item upwards and downwards The round button in the center is an enter button to enter the scree...

Страница 25: ...24 3 4 Power Up and Shut Down Figure 3 1...

Страница 26: ...Vega off Press the on off switch and hold it for 3 seconds until the display blanks If you wish to save the current Vega configuration use the Configure function before switching off For measurements...

Страница 27: ...enter button again For more details on the various screen options see section 4 6 Figure 3 1 1 Needle Screen RS232 Baud Rate If you are using the Vega for RS232 communication with a PC the baud rate c...

Страница 28: ...month with the up down navigation keys then move to the date with the right left navigation keys and so on Save and enter Do the same with the time 3 5 5 Zero Adjustments In the Vega all adjustments i...

Страница 29: ...menu Select the desired display mode and press the Enter key Note For Pyroelectric Sensors In addition to zeroing the meter as described in section 3 5 5 it is important to zero the meter against the...

Страница 30: ...nstrument without the backlight when not necessary 3 6 2 Charging The Vega can be operated either by battery or from an AC source with the charger plugged in all the time Plug the charger in the jack...

Страница 31: ...tput is useful for driving chart recorders and other analog devices The voltage is proportional to the reading on the display and scaled such that full scale equals 1 00 2 00 5 00 or 10 00 volts as se...

Страница 32: ...ecognize if a sensor had been connected or disconnected while the device is powered on If such an event happens a warning screen will be displayed for 3 seconds after which the Vega will restart itsel...

Страница 33: ...d press the Enter key Settings that can be adjusted are LCD Lighting Keypad Lighting Color Scheme and Bargraph Style and parameters 3 Select the setting to adjust with the up down navigation keys and...

Страница 34: ...both the LCD and Keypad backlights are in toggle mode then High LCD backlight will be coupled with the keypad backlight being off and Low LCD backlight will be coupled with the keypad backlight being...

Страница 35: ...eens All color enhanced features of the Vega will not be functional in any of the monochrome screens The schemes that can be selected are as follows Black text on white background Sky blue text on bla...

Страница 36: ...d green Between 30 and 60 it will be displayed black or white Between 60 and 90 it will be displayed yellow and above 90 of full scale it will be displayed red These are the default cutoff values They...

Страница 37: ...the highest power lasers Sensor Type Liters per Minute At Full Power Min Pressure Bar US Gallons per Minute 10K W 9 2 2 5 5000W 4 5 0 8 1 2 1500W 2 5 0 5 0 7 1000W 1 8 0 5 0 5 Table 1 Minimum Flow Rat...

Страница 38: ...arge variation of absorption at different wavelengths Therefore a continuous spectral curve is inserted into the sensor enabling the user to choose the desired wavelength from the range specified in t...

Страница 39: ...se Power or Energy Measurement The Vega thermopile sensors can measure both power and single shot energy See Sections 4 4 and 4 5 for details To change from power to energy measurement or vice versa d...

Страница 40: ...r This feature is especially useful for lasers with unsteady output See section 4 4 2 4 for details 5 Now select Energy Range and choose the energy range you wish to be the default The Vega will now b...

Страница 41: ...ng power measurement screen or the needle display screen 2 If the Vega is in Energy mode pressing the Power soft key will cause it to enter the power measurement mode 3 Center the laser beam carefully...

Страница 42: ...ghlighted To cancel press Offset again If the Offset is engaged and you wish to subtract out a new value of the background press Offset twice The first press will cancel the old value and the second w...

Страница 43: ...1 minute Save before exiting if you want this to be the new default Note that saving the graph value will also save the XX value as default 4 If you press Max it will set the NOW value on the screen t...

Страница 44: ...ent is set to average mode the instrument displays the average of readings over the period since the screen was entered up to the present When the time period of the average is reached the average bec...

Страница 45: ...do this After setting Normalize all subsequent readings will appear as a ratio to the reference reading For instance if you normalize the reading at a power of 1 5W then subsequent readings will be w...

Страница 46: ...ll record data until the screen is full or until the reset button is pressed With the RS232 or USB adapter the data can be read out to PC in real time or later after storage Power logging has the foll...

Страница 47: ...en display will expand fivefold around the present power value Press Zoom again to cancel the expansion If you want to start a new measurement and not save the present data press Reset If you want to...

Страница 48: ...ster is up to 27000 points unless less data is available or a lower Sample Rate has been selected The data can be stored to file as described below To store the data do the following 1 When you have g...

Страница 49: ...nd enter you will be able to show the actual data points instead of a graph Select the data file you want and press the Enter Key middle button of the navigation keys This will open a screen showing a...

Страница 50: ...ll sample points but not log every single point 4 5 Energy Measurement 4 5 1 Setup Switch the Vega on If it is in power mode press the left soft key Energy to put it into energy mode The energy mode i...

Страница 51: ...splayed 4 5 3 Minimum Energy Threshold If the Vega is used in a noisy environment or where there is a high level of background thermal radiation the instrument may trigger spuriously on the noise or b...

Страница 52: ...Very Low Energy When it is necessary to measure pulses of very low energy i e less than 0 5 of the maximum range of the instrument the following two alternative methods allow greater accuracy to be o...

Страница 53: ...rs The pyroelectric sensors are compatible with the Vega and just have to be plugged in to be used For higher pulse energies you can use the Ophir model RP to measure both average power and exact indi...

Страница 54: ...er is full FULL will be displayed If you wish to see finer variations in the graph press the Zoom button 3 When Reset is pressed the Vega is ready to begin a new measurement If you want to store the d...

Страница 55: ...of a laser beam into the meter and you wish to display the full beam do as follows 1 From the main power or energy measurement screen enter Menu select Attenuate and enter again 2 Enter Beam and then...

Страница 56: ...uation Screen with Beam set to 20 Note 1 The attenuation screen only affects the value displayed on that screen and nothing else The power and energy scales remain the same the damage thresholds remai...

Страница 57: ...ou wish to adjust and press the left navigation key 5 Now modify by pressing the up down navigation keys to change each number and the right left navigation keys to move to the next number After you a...

Страница 58: ...er or under the limits chosen the error message will be shown as in Figure 4 9 Note that the lower limit is shown on the upper left and the upper limit on the upper right Figure 4 9 Limits Screens wit...

Страница 59: ...hange measurement settings go back to the reduced needle screen by pressing Return Figure 4 10 Needle Screens with a photodiode sensor Other Types of Sensors The functions described in the sections ab...

Страница 60: ...detectors cancels On the other hand when a laser beam falls on the sensor it illuminates only the first detector and therefore is detected Thus the PD300 subtracts most of the background while detect...

Страница 61: ...00 PD300 TP PD300 3W PD300 UV 3A IS Wave Length PD300 IR PD300 IRG 250 350nm N A N A N A 300mW N A 800nm 0 8mW 100mW 400nm 300mW 1W 3W 300mW N A 1 1 3 m 0 8mW 30mW 633nm 300mW 1W 3W 300mW 1W 1 4 m 0 8...

Страница 62: ...tomatically goes into the measurement mode you want upon startup Since these desired settings are saved in the sensor smart connector you can save different settings for different sensors The followin...

Страница 63: ...ameters from the screen In addition these settings can be saved as startup defaults so the sensor will be in the desired configuration when turned on 5 4 1 To Set to the Laser Wavelength Being Used Ph...

Страница 64: ...ange since it changes scale even if you don t want it to do so If you want to measure the same range all the time it is better to use manual range The correct range to select is the lowest one that is...

Страница 65: ...se the Vega has a filter setting and uses the proper correction curve depending on whether the filter is installed or not Warning If the PD300 is used in the Filter IN setting and the filter is not in...

Страница 66: ...ll cancel the function 5 4 5 Offset The PD300 and PD300 3W sensors have automatic background subtraction as described in Section 5 2 In addition the offset function can be used to subtract the residua...

Страница 67: ...to 0 dB note that now the units are dB a relative value instead of dBm an absolute value 2 Now make your second measurement and the value of the difference in dB ratio in numerical units will be shown...

Страница 68: ...les 5 4 8 Tune and Power log The Tune function an exclusive Ophir option makes adjusting your laser to its maximum power easier than ever before Unlike a bargraph or mechanical meter this display show...

Страница 69: ...1 Pyroelectric sensors method of operation When a pulsed heat source such as a laser is directed at the detector sensor a temperature gradient is created across the pyroelectric crystal mounted in the...

Страница 70: ...PD10 PJ operates in a similar fashion to the PE sensor except that it has one extra function When measuring very low energies the sensor will also be sensitive to background light and therefore show...

Страница 71: ...se the following procedure to set the pyroelectric or PD10 PD10 PJ sensor to your laser wavelengths 1 From the main display select Laser and enter 2 Use the up down navigation keys to select the first...

Страница 72: ...the actual laser pulse width Some sensors only have one pulse width setting and measure all pulse lengths on this setting In that case N A will appear Warning If the pulse width is incorrectly set to...

Страница 73: ...ed for later recovery and transmission See section 4 4 2 6 1 However the display can only display at rates up to 10Hz At higher rates if the user has chosen NONE the Vega will display individual pulse...

Страница 74: ...ave the new value as the default start up for this sensor press save 6 3 Startup and Configuration of Defaults If you are planning to do repetitive measurements most of the time you can set up the Veg...

Страница 75: ...e section 4 4 2 4 for details 5 Now select Diffuser if your sensor has a removable diffuser and select if you wish diffuser in installed or out not installed to be the default 6 Now select Max Pulse l...

Страница 76: ...perly it is important that the sensor is not grounded to the optical bench Make sure that the sensor is isolated electrically from the ground The PE sensor has been supplied with an insulating mountin...

Страница 77: ...is the lowest one that is larger than the pulse energy measured If you want this to be the default press Save or return to main screen by pressing the Enter key 3 Press the menu button select Configu...

Страница 78: ...able to record each pulse at up to 4000Hz even though it is displaying at a much lower rate This data can be stored in a data file and recovered and transmitted later Besides the usual range laser ave...

Страница 79: ...mJ In order to measure exposure do the following 1 From the energy measurement screen select Menu and enter Select Exposure and enter 2 Setup the desired measurement parameters as follows Timeout Defi...

Страница 80: ...o reset reading to zero before another reading press Reset 4 To return to the regular energy measurement screen press Energy Warning Pressing Reset will terminate the exposure measurement session 6 4...

Страница 81: ...malize press Apply From then on the energy will be proportional to the normalized energy value See Figure 6 3 3 If you wish to return to the the regular display press Energy Note that in Present is sh...

Страница 82: ...g the laser at energy below damage threshold and measuring the energy with and without the beam splitter and you can then use the attenuation feature Section 4 6 1 to display the actual laser power or...

Страница 83: ...easurement screen press Menu and then select Data Log 3 With the up down navigation key buttons indicate the appropriate laser graph settings and frequency Then choose the log size i e how many points...

Страница 84: ...Vega meter which samples at the maximum rate the scope adapter shows every single pulse Activate the scope adapter as follows 1 Plug the adapter into the Vega meter and then plug the sensor plug into...

Страница 85: ...ed on the sensor respectively 4 To change from IN to OUT press IN the statement Diffuser is IN will appear Press Change the statement Diffuser is OUT Ensure that diffuser is removed from sensor will a...

Страница 86: ...ality see Chapter 4 Operation with Thermopile Absorber Sensors 7 1 Track Screen This screen shows the position of the laser beam as measured by the sensor If the beam is close enough to the center and...

Страница 87: ...the Menu screen from the main Track Screen Figure 7 2 BeamTrack Menu Screen 7 3 Stability Screen This screen tracks the position of the laser beam over time This is useful for users that want to meas...

Страница 88: ...tatistics Screen This screen shows statistics for power position and size measurement over time Figure 7 4 Statistics Screen Press the Rate softkey to change the sampling rate Press the Reset softkey...

Страница 89: ...order to filter out noise that may be introduced to the measurements from the local power supply in the Configuration Screen set Line Frequency to 50Hz or 60Hz depending on the country you re in Figur...

Страница 90: ...to the above basic analog circuit the Vega contains a second fast analog input This supports certain Ophir sensors that read energy pulses at higher rates than can be supported by the basic analog cir...

Страница 91: ...elf accordingly Recalibration data and saved settings are also stored in this memory chip A single DIN socket is used for communications via USB or RS232 Only one or other of these communication optio...

Страница 92: ...alibration The absorption of this coating is above 85 for most of its range as shown in graph 1 below EX excimer absorber The EX absorber provides high absorption in the UV and it can withstand both t...

Страница 93: ...high damage threshold for pulsed and repetitively pulsed lasers of both the short and long pulse variety and is useful where the highest pulse energies and average powers are used PF high energy high...

Страница 94: ...Accuracy of Ophir Thermal Sensors 9 1 2 1 Linearity The linearity of most Ophir thermal detectors is specified to be 1 over the specified power range of each particular instrument and is tested by Op...

Страница 95: ...A detailed discussion of Ophir calibration accuracy is available on the Ophir website at http www ophiropt com laser measurement instruments laser power energy meters tutorial calibration procedure 9...

Страница 96: ...e g CO2 YAG or VIS press Laser to select correct type of laser before calibration When recalibrating using Specific this laser only function only the calibration of the chosen laser wavelength will ch...

Страница 97: ...ange of wavelengths for both filter out and filter in The calibration curve is normalized to the correct absolute calibration at 632 8 nm using a HeNe laser against a reference meter traceable to NIST...

Страница 98: ...avelength from a Known Source of Laser Power 1 From the main measurement screen select Menu and enter Select Calibrate and enter 2 Enter Laser and select the proper laser wavelength Enter Average and...

Страница 99: ...ithstand energy densities up to 0 8J cm for short pulses and 2J cm for long pulses without changing calibration The absorption of this coating is above 90 for most of its range as shown in Graph 3 bel...

Страница 100: ...4nm repetitively pulsed laser referenced to a NIST traceable thermal power meter The average energy is set to the average power of the standard power meter divided by the laser frequency The spectral...

Страница 101: ...earity and inaccuracy due to errors in the wavelength curve The non linearity is approximately 2 and the error due to wavelength is given in Table 3 above In addition to the above errors the reading o...

Страница 102: ...e sensors when the calibration is changed at one laser wavelength the overall calibration of all other wavelengths changes proportionately 9 4 Error Messages The Vega displays various error messages w...

Страница 103: ...Recharge overnight with the Vega turned off for 7 8 hours If the Vega still doesn t work with battery then the NiMH battery is probably dead Replace battery see section 9 6 1 4 9 5 2 Thermal Sensors E...

Страница 104: ...s very hot allow it to cool Disconnect the sensor from the instrument If readout unit does not zero follow instructions in section 3 5 5 If the offset persists try zeroing with the sensor connected as...

Страница 105: ...k leads from the circuit by holding the two wires firmly and tugging them firmly in a direction away from the circuit board 3 Insert the new battery into the same location in place of the old battery...

Страница 106: ...erates from charger or battery Bargraph segments 320 Battery 3 x AA size 2 4Ah NiMH battery built in Charger input DC 12 25V 5W AC 9 18V RMS 5W Charge time 7 8 hours automatically switches to trickle...

Страница 107: ...0 W 12KW cm BB L50 150 A LP1 35 50 150 W 38KW cm LP1 L50 150 A EX 35 50 150 W 2KW cm EX L40 150 A 35 150 W 12KW cm BB L40 150 A LP1 35 150 W 38KW cm LP1 F150A BB 26 150W 12KW cm BB FL250A BB 35 250W 1...

Страница 108: ...density BF very high damage threshold long pulses FS Fused silica window close to detector for divergent beams Note For more detailed and exact specifications see the latest Ophir Laser Measurement In...

Страница 109: ...2 2 3 Setting the Threshold PE C sensors and note in 6 4 1 2 In chapter 9 added PF took out HL clarified linearity and redid Total Accuracy of Calibration section Corrected sensor to sensor rev 1 98 1...

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