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= Amplifier = = Laser Amplifier =
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For investigating Ponderomotive effects, we may need ~100 kW circulating in the arm cavities. For this, we --are-- were looking at getting an amplifier to boost the 1 W input we have right now. Now we have decided to go with the following setup:
 1. RIO Planex (1064 nm) as master oscillator; output ~ 20 mW, see [[RIO_Laser|datasheets]].
    * Commercial (Thorlabs) temperature controller
    * Thorlabs butterfly package
    * How to package for low acoustic sensitivity?
    * Use the latest version of Johannes/Luis/Rich diode driver for driving the current and locking to the IMC. Make sure to order 2 units from Luis.
    * Need fiber to free space thing with low AR / good polish
    * Fiber based PM for locking to IMC w/ high bandwidth.
    * Fiber based AM for intensity servo
 1. 1-2 stage CW fiber amp to take us to > 20 W
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Some formal quotes / info from talking to sales reps: -----
=== Vendor Info ===
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    * Rana contacted Aug 7 to enquire about 20 W output w/ air-cooling only and 20 mW input.
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* Rana contacted Arturo on June 25; waiting for reply.

 1. NuFern (now Coherent) does not make amplifiers anymore, only MOPA.		     * Rana contacted Arturo on --(June 25)-- Aug 7; waiting for reply.
 1. Nu''''''Fern (now Coherent) does not make amplifiers anymore, only MOPA.
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 1. RPMFC lasers:  1. [[https://www.rpmclasers.com/product-category/laser-amplifiers/|RPMC lasers]]:
    * RPMC is just a distributor. The Amplifiers are made by [[http://www.bktel-photonics.com/product/optical-amplifier-in-module-or-table-top-equipment/|BKtel]]
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    * BKtel webpage [[http://www.bktel-photonics.com/wp-content/uploads/2019/01/DBe-THPOA-1.pdf| claims]] 40W output for 30 mW input. Seems exactly what we want.
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    * Oct 9: No response, crappy webpage
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 * The NeoLase stuff is probably the highest quality, but also expensive?  * The NeoLase stuff is probably the highest quality, but also expensive? Maik should reply by Aug 13.
 * Optical Engines, IPG, NPphotonics, all seem more expensive with little benefit.
 * My reco is that we go for RPMC/BKtel as long as their responses seem OK to us.
 * We'll have to get 3-4 quotes for competitive bidding instead of sole source justification.
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{{https://www.thefoa.org/tech/ref/testing/test/dB-W.jpg}}

Laser Amplifier

Vendor Info

  1. After talking with NeoLase, one candidate is the NeoVan-2S-HP.

    • 25k euro.
    • 30W out for 1W in.

    • Quote and specs: Quote.

    • Paper about this amplifier performance: OL.44.000719

    • Optional air cooling in case we want to avoid water cooling.
    • Need to confirm that the amplifier can be integrated with out Acromag slow control system.
    • Rana contacted Aug 7 to enquire about 20 W output w/ air-cooling only and 20 mW input.

  2. Quote from Optical Engines:

    • Quote_opticalEngines

    • 50k$
    • maybe we can have something cheaper if we supply 1W instead of their spec of 30 mW?

  3. Spoke with rep from NPphotonics - expected quote is <$30,000 for an amplifier only.

    • Re-contacted them on 25 June 2019, waiting for a response.

    • Rana contacted Arturo on June 25 Aug 7; waiting for reply.

  4. NuFern (now Coherent) does not make amplifiers anymore, only MOPA.

  5. IPG Photonics YAR-LP-SF

    • 30 W output for 5 mW input

    • ask them about 500 mW -> 30 W (44 k$)

    • quote: amplifier.pdf

  6. IPG Photonics fiber amplifier for a low power seed:
    • 20W output with 3 mW input
    • Johnny Poon says its $35k

    • YAR-20

  7. RPMC lasers:

    • RPMC is just a distributor. The Amplifiers are made by BKtel

    • $15k for 20 W. 1064 FC amplifiers

    • if we use a 20 mW seed, they add a pre-amp (cost increase by ~2.5k$)
    • contact - Shawn Smith

    • BKtel webpage claims 40W output for 30 mW input. Seems exactly what we want.

  8. Amonics

    • Got in contact with them today (25 June 2019), waiting for a response
    • Oct 9: No response, crappy webpage

Commentary from Rana (Aug 7, 2019):

  • The NeoLase stuff is probably the highest quality, but also expensive? Maik should reply by Aug 13.

  • Optical Engines, IPG, NPphotonics, all seem more expensive with little benefit.
  • My reco is that we go for RPMC/BKtel as long as their responses seem OK to us.
  • We'll have to get 3-4 quotes for competitive bidding instead of sole source justification.

Power Calculation

See Power Calculation page https://www.thefoa.org/tech/ref/testing/test/dB-W.jpg

Why Fiber and not Free Space ?

Because fiber seems to be the way of the future...

What's the price / ease-of-use difference for the free space vs fiber?

If we continue with the 2W NPRO, we would use the free space amplifier, but its possible to use a RIO Planex with a fiber amplifier.

Laser/Amplifier (last edited 2019-10-09 19:36:50 by RanaadhikariATligoDOTorg)