Polhe3 laser

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laser howto


How the interlock is made http://hallaweb.jlab.org/equipment/targets/polhe3/lab/laser/QPClaser/sultra-system%20interlock.pdf

Its interlock is from "spare" port at back, not "ext" port. You need connect our specially made interlock cable by Mark Taylor to the right one.

It's password for setting change is "9720" for SN 1209020



Turn on the power supply first, then temp control, then laser. Do it in this order, otherwise diode can be damaged!


manual http://hallaweb.jlab.org/equipment/targets/polhe3/lab/laser/coherent/manual/

laser status

QPC laser status

QPC Sultra50A, Jlab tag F223625, SN 1209020, ordered 2012/10

2013/11/25 repaired

According to QPC, diode bar was damaged and replaced, the root cause is unknown
It came with a new version of software too

2013/09/27 returned for repair

after about 200 hours in June and July with 95% current, it suddenly only gave power less than 1W

2013/05/02 repaired

The interlock is working now.
The diode temp control board is fixed (QPC ask its vendor to fix it) 
and the temp is within 0.4C (+-0.2C) and the laser spectrum doesn't move more than 0.01m or so.

2013/03/15 returned for repair

Summary of test Sultra50A SN1209020
1. Its peak position is at 794.65nm at about 27C laser diode temp with power 24W at 95% max current
2. Its peak position can be adjusted via diode temp for about 0.75nm/C 
3. Its FWHM is about 0.3nm. But the peak oscillates within 0.2nm in about every 10s no matter how long it stays on.
   So the effective FWHM is about 0.5-0.6nm. The reason could be that the laser diode temp is not very stable 
   and oscillates within 2C (+-1C).
4. Its interlock via spare connector is not working 
5. details are here http://hallaweb.jlab.org/equipment/targets/polhe3/lab/laser/QPClaser/test_Sultra50A_SN1209020/


  • We can add a red visible aiming beam and a monitor photodiode (not a power meter). The price is $1,100. The monitor photodiode is installed inside the module. Its output signal is proportional (or nearly) to the actual laser output power. You then reference this number on the MPD/Power Calibration table that will be included in the test report. The photodiode value is displayed on the UGI (User Graphic Interface). See picture. Alternatively, you can just buy a power meter to determine the output power (Gentec and Ophir both make power meters).
  • a remote control touch panel (see attached photo). The price is $3,500 (p/n 350-1001-006). see photo. The remote control panel uses the RS232 connector. So the laser can only connect to either the control panel or the computer. But not both at the same time.

Raytum-photonics status


comet laser status

diode, controller, fiber status

order 2008/10 order 2009/02

jlab1 driver tag F222839 SN 1137, temp tag F222854 SN 1137

jlab2 driver SN 1149, temp SN 1227

rutgers driver SN 1133,temp SN 1247

coherent laser status

for best absorption, at 30nA, coherent #3 16.5, #4 15.5, #5 18.0


we bought 4 spare FAP bars, only 2 in lab

The bar from 2001 has no order record

where is ordered 2005/05 1 FAP

where is order 2001/01 1 FAP

where is order before 1999

which one repair 2005/09

which two repair 2001/04


ordered 2007/08 1 duo FAP 1 FAP

ordered 2006/11 2 FAP bars

ordered 2005/10 1 duo FAP 2 FAP bars

ordered 2005/08 1 duo FAP

ordered 2005/05 1 FAP

ordered 2001/10 2 FAP

order 2001/04 1 FAP 2 repair FAP-79-30C-800-I Integrated FAP (FAP-I) replacement for Coherent' s standard 795 nm FAP sys tem. Same specifications as the FAP system (item 1)

order 2001/01 1 FAP

order 2000/12 FAP system 30 W @ 795 nm demo unit. It is currentl y at JLab for testing.

order 1999/11 2 OPC-D030-790-FC 30 Watt CW fiber-couples diode laser module. (1.5 mm fiber bundle diam eter; beam divergence: 12 degree cone). To be used as spare module for cust omer's existing system. Specifications: 1. Integrated system must supply 30 W at 795 nm wi th a bandwidth of less th an 3nm. 2. At specified power (30 W) the integrated system power supply must have at least 5A headroom. 3. At specified pwer (30W ) the diode temperatures must fall in the range > 22 degree C and < 30 degr ee C at an ambient temper ature of 25 degree C.

order 1998/09 1 OPC-D030-FCHS 30 Watt CW integrated fib er coupled diode laser un it. Bundle diameter 1.5mm . Central wavelength 795 nm. Bandwidth less than 3 nm FWHM. Diode operatin g temperature less than 28 degree Celsius, Ambien t temperature lesss than 25 degree Celsius.

order 1998/04 2 OPC-D030-FCHS 30 Watt CW integrated fib er coupled diode laser un it. Bundle diameter 1.5mm . Central wavelength 795 nm. Bandwidth less than 3 nm FWHM. Diode operatin g temperature less than 28 degree Celsius, Ambien t temperature lesss than 25 degree Celsius.

repair 2005/09 Coherent laser 30 w FAP-s ystem now only deliver ~ 20 w. Need to replace a b ad diode and an internal fiber. Also replace filte r. The total repair cost (after discount) is $9500 (par Vic Gallant's email notification). Since we a lready paid $1500 evaluat ion fee (PR 235350), the remain cost is $8000. Thi s PO covers this remain p art of the repair cost. T he case number is 364235 Coherent laser 30 w FAP-s ystem now only deliver ~ 20 w. This PO is to cover the cost of evaluation t o find out what's the pro belm. The case number is 364235.

repair 2003/01 Repair of Coherent FAP-I system. The laser is not emitting laser light. Serial # 04209

repair 2001/10 Coherent laser #4151 has both inside and outside o ptical fibers scratched. This PR is to replace bot h fibers.

repair 2001/04 Repair two broken lasers Coherent FAP-System.

Velocity laser status

6300 controller F2-15521

order 1999/07 6317 Velocity Laser System. Wavelegnth Range: 392.5-801 nm; Output power: 6mW; Mode hop free tuning in both tuning directions.

repair 2008/10 Repair 6317 Velocity Laser System. Cavity rebuild: change diode, test and re-calibrate the unit.

laser info

Spectra-Physics Comet Laser

SFCB Comet: 795nm, 25W output, 0.2nm width

In the set of transversity experiments, we used line-narrowed lasers called Comets. They put out 20-25W of light @ 794.7nm with a width of 0.2nm. They were manufactured by Spectra-Physics, which was owned by Newport at the time. However, the Comets are no longer available from the special Spectra-Physics factory where they were made. The factory was bought by Oclaro a couple of years ago. It was shut down and operations were moved to Europe. However, Oclaro discontinued the VBG line-narrowed diode bar product line.

Some detailed info about the comet laser set: "EWR-NSI EWR-BAR kit, includes: COMET single fiber coupled bar with VBG locking to 794.69 nm. With S10404-C specifications (See below). 763-FCBAR-KIT, Laser Diode Drive Kit: 5600-65 High Power Laser Diode Driver, 65 A. 3150 advanced High-Power temperature Controller. 763H-FC Fiber coupled laser diode mount. 5600-04 Laser Diode Driver cable; 5600 to 763H series. #150-04 Temperature Controller cable; 3150 to 763H series. S10404-C specification: CW power >=25 watts, driving current <=60 A, threshold current <15 A, operating voltage <2V, central wavelength 794.69(+0.1/-0.15). Spectra band 0.7 nm. Spectral Width (FWHM) <=0.35 nm. Beam divergence 98% power within 0.22 NA. Package type SFCB/Comet laser. Fiber length 1m with PVC jacket. Fiber diameter 400 micro meter with SMA-905 connector. Operating temperature 20-35C. 20% increase in drive current required of rated power. 12 months warrant. FAPsys-Remote-60W-794.8-Dual. 60 Watts (Dual 30 watts) CW diode laser system at 794.8 nm wave length. 2x 800 um fiber bundle. Spectral width less than 2 nm. NA < 0.20. Noise <1% rms. Power stability <+-5%. Delivery fibers: two 5-m long armored-jacketed optical fibers with SMA 905. Diode temperature control range 10-35 degree C. Oprating temperature range 0 to 40 degree C. Front panel keypad. RS 232. External TTL. Rack mount."

QPCLaser BrightLock & S-Ultra Laser

At the moment, we may have two options: 1) QPCLasers BrightLock and/or 2) OptiGrate's Tunable Spectrally Narrowed Laser. Note that prices below are from earlier this year, February and August 2011, respectively.

BrightLock Ultra-50: 795nm, 25W or 30W output, 0.5nm width

http://www.qpclasers.com This option is a product offered as a "replacement" to the Comets. Unfortunately, the BrightLock diode bars are more than double the width of the Comets.

  • A BrightLock Ultra-50 module @ 794.5nm is $5000 for 25W (400um

fiber) version, $5150 for 30W (600um fiber) version. http://www.qpclasers.com/products_BLockU50.html

  • They also sell high power versions of the BrightLock modules (75W & 150W).

Contact is Merrill Apter: e-mail: mapter@qpclasers.com, phone: 818-986-0000

E-mail about Ultra-50 794.7nm Brightlock lasers

As per our conversation at JLab last Friday, Oclaro (Newport Spectra-Physics) no longer manufactures the line-narrowed lasers we bought in the past couple/few years. A new company offers a slightly less narrowed replacement: QPC Lasers. Sales Engineer Merrill Apter is a colleague of Rick Frost, formerly from Spectra-Physics.

Forwarded message ----------

Date: Tue, 8 Feb 2011 16:54:18 -0800 From: Merrill Apter <mapter@qpclasers.com> To: "wat4y@virginia.edu" <wat4y@virginia.edu> Subject: Pricing and Lead time for Ultra-50 794.7nm Brightlock lasers

Hi Al,

By way of this email I'd like to formally re-introduce myself to you. I'm now Vice President of Business Development at QPC Lasers <http://www.qpclasers.com/>. The reason for my email is that I've been informed that Oclaro is obsoleting their VBGed 794.7nm Comet laser and to ensure that the many customers who have previously purchased this product have an alternative supply we are coordinating activities with their sales and marketing force in a seamless transition moving the Oclaro customers to us. As you probably know we have a mature, commercial product with enhanced performance when compared to what Oclaro offered.

We commercially offer a 25W Brightlock product where the light is delivered via a 400um diameter, 0.22NA fiber jumper. If you can tolerate a larger aperture (600um diameter, 0.22NA fiber jumper) we can rate the Ultra-50 Brightlock module to 30-watts, CW.

As a proof statement to the performance of our Brightlock product, I've included a final test data sheet from a recently manufactured Ultra-50 Brightlock module. You should also know that both our 25-watt and 30-watt product can be supported by our newly introduced turnkey solution named S-Ultra (commercial data sheet attached).

To ensure that our customers are spending their valuable time with their experiments and less time trying to cool, drive and control these diodes we recently (Photonics West, January 2011)introduced our (System Ultra) S-Ultra turnkey solution. The unit price for either a 25-watt or 30-watt S-Ultra is $15,900. Delivery is 8-10 weeks ARO. The unit price for the Ultra-50 Brightlock @ 794.5nm is as follows: $5000.00 (25-watt version), $5150.00 (30-watt version).

We also have fiber-coupled modules rated up to 150W, CW (see datasheets for Ultra-100 and Ultra-500) which can be sold with stand alone diode drivers and thermal platforms.

As you probably recall the benefits of our Brightlock technology is 4 fold, Brightlock technology is an on-chip Bragg grating which offers these 4 key benefits: 1) Locks the wavelength centroid +/-1nm over a 30 degree C ambient change 2) Has minimal impact to the overall E2O efficiency 3) Spectral width narrowing @ FWHM typically to < 0.5nm 4) The diode laser is highly insensitive to temperature changes, although as opposed to VBGs there is fine tuning capability. As you know a non-VBGed/conventional diode has a wavelength shift as a function of temperature of 0.3nm/C, a VBGed diode laser has no tuning capability while the Brightlock technology has a wavelength shift coefficient of 0.07nm/C.

Finally I've included a publication that will provide more details about our Brightlock technology and how it compares to VBG technology.

If you need more information or pricing about our modules or S-Ultra turnkey solution do not hesitate to contact me.

Best regards,

Merrill M.Apter | Laser Operations LLC - QPC Lasers | Vice President Business Development | Email: mapter@laseroperations.net<mailto:mapter@laseroperations.net> | Direct: +1 818-986-0000 | Cell: +1 650-224-1707

OptiGrate Tunable Spectrally Narrowed Laser


Contact is Igor Ciapurin, e-mail: iciapurin@optigrate.com, phone: 407-381-4115 (ext. 223) and Aleksandr Ryasnyanskiy <aryasnyanskiy@optigrate.com>

This option has a line width 0.05nm FWHM, up to 10 times narrower than the QPC Laser product. Tunability range is about 0.1nm. Uses a water chiller in addition to TECs. The cost is about $55,000 for the 70W system (about 2011 quote), which uses two diode bars @ 35W output each.

Duke Haiyan Gao group has one 70W system

info from vendor in 2017 "We have 35, 65 and 95 W versions. Now we have polarization maintaining rod, so the output of the laser is linearly polarized. We also include the beam expander/polarizer which gives you up to 3 inch beam with circular polarization. The price for 35 W is a little bit more than the half of 65 W system because the same chiller, power supply and many staff in the controller are used for 35 W system anyway. The cheapest in terms of price per W will be 95 W one. We also have 770 nm pump for K, and hybrid systems for Rb/K pumping.

In our new systems we have polarization maintaining fiber rod which is inside the laser box, so the laser output is linearly polarized. You can put a beam expander/polarizer just after the laser box and have 45 mm beam with circular polarization. The beam expender include high power polarization beam-splitter to clean the linear polarization, quarter wave-plates and lenses to expand the beam. Everything is sealed. The price for the systems without chiller is $40,250.00 for 65 W and $52,050.00 for 95 W system. Chiller is $5,000.00."

see File:OptiGrate Laser system.docx pic

Raytum-phonotics Corp 0.3nm width


other company


asked, can't do 0.3nm


spectrometer status

  • USB2000 (SN USB2E4132)
    • working and calibrated ok. it has poor resolution though.
    • According to oceanoptics, Grating #6, about 200nm spectral range, 5um slit (660-930nm); (0.3-0.4nm FWHM)
  • USB4000 (SN USB4C02495)
    • has double peaks, needs service. Oceanoptics fixed it and recalibrate it for about $350
    • According to oceanoptics, Grating #6, about 200nm spectral range, 25um slit (0.4-0.5nm FWHM); 675~850nm)
    • USB400 has distance between two neighboring points ~0.2nm
  • HR4000
    • a copy of Todd's HR4000 (SN HR4C1275), cost about 5k
    • According to oceanoptics, Grating #11, about 60nm spectral range, 5um slit (0.04nm FWHM); 750~800nm)
    • Grating #12 cannot be used above 780nm, so the current configuration is the best we can get
    • HG-1 calibration source
    • has extra peaks, but Oceanoptics say these are 2nd peaks and they are ok.
    • 1 working, 1 maybe not working, 1 seems broken

how to calculate optical resolution http://www.oceanoptics.com/technical/opticalresolution.asp

how to customize a HR4000 http://www.oceanoptics.com/Products/benchoptions_hr.asp

QPC laser lifetime test

1. Start 10:00AM, 06/03/2013