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NuAmp CW Fiber Amplifiers

NuAmp CW Fiber Amplifiers
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NuAmp CW Fiber Amplifiers

Product catalog summary
Overview: The document discusses the development and performance of high-power single-frequency fiber amplifiers at wavelengths of 1mm, 1.5mm, and 2mm. It highlights advancements in amplifier platforms, suppression of Stimulated Brillouin Scattering (SBS), and the use of Yb-doped fibers for extended wavelengths.
Single Frequency PM Amplifier Platform (2-15W): This section covers specifications and performance of single-frequency polarization-maintaining (PM) amplifiers. The practical SBS limit is around 20W at 1mm and 15W at 1.5mm. The platform supports standard wavelengths of 1060-1085nm and 1545-1565nm, with options for isolation and control. Over 50 units have been delivered in the past four years.
Extended Wavelengths Using Yb-doped Fibers: Yb-doped fibers are used to achieve extended wavelengths, focusing on a 5W 1106nm single-frequency amplifier. Performance is evaluated in terms of power and polarization extinction ratio (PER).
High Power Amplifier Platforms (40W and 100W): The 40W platform uses PM large mode area (LMA) fibers to increase the SBS threshold. The 100W platform employs a temperature gradient along the fiber to shift the SBS gain spectrum, achieving high output power with specific optical and mechanical specifications.
SBS Threshold and Linewidth: The SBS threshold depends on the linewidth of the seed source. Broadening the linewidth can be an acceptable compromise to achieve higher output power.
Nufern Turn-key 1kW Amplifier: A multi-stage turn-key amplifier with a 3GHz seed source achieves 88% slope efficiency and linearly polarized output.
High Power Single Frequency 1.5mm PM-LMA Amp: A high-power amplifier using Er:Yb PM LMA fibers achieves significant output power and efficiency.
Advances in Tm-fibers for 2mm Wavelength: Reviews historical and recent advances in Tm-doped fibers, focusing on improvements in efficiency and single-mode beam quality.
Monolithic 20W Single Frequency PM Amp (2040nm): Describes a monolithic 3-stage PM amplifier compatible with semiconductor DFB diodes at 2µm.
High Power Single Frequency at 2µm: Discusses a 600W single-frequency amplifier using Tm-LMA fibers, highlighting its performance and non-SBS limited results.
Introduction: The document discusses advancements in narrow linewidth lasers, focusing on 1um, 1.5um, and 2um wavelengths. These lasers produce narrow linewidth sources in the visible regime through harmonic generation.
RGB Harmonics from Fiber NLLs: Additional wavelengths can be generated using Sum-Frequency Generation (SFG), expanding the range of available laser sources.
Frequency Doubling of High Power Fiber Lasers: Describes coupling of Fiber MOPA (Master Oscillator Power Amplifier) to enhancement cavities to achieve frequency doubling, enhancing power and efficiency.
Conclusion: Significant advancements in fiber design and SBS mitigation techniques have been achieved:
  • 1.0um single frequency amplifiers with up to 100W power and <5kHz linewidth.
  • 1.5um single frequency amplifiers with up to 100W power and <5kHz linewidth.
  • 2um single frequency amplifiers with up to 600W power and 3MHz linewidth.
These developments, combined with improvements in harmonic conversion cavities, enable production of a wide range of narrow linewidth lasers suitable for targeting various atomic transition bands.
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Catalog excerpts

NuAmp CW Fiber Amplifiers -1

□ sa BE Progress on High Power Single Frequency Fiber Amplifiers at 1|mm, 1.5mm and 2|mm www.nufern.com

 Open the catalog to page 1
NuAmp CW Fiber Amplifiers -2

Examples of Single Frequency Platforms at and 1.5mm and Applications

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NuAmp CW Fiber Amplifiers -3

Single Frequency PM Amplifier Platform (2-15W) 5 700 600 500 400 300 200 10 ^4 0 «■►♦ ♦ ♦ ♦ ♦ ♦ 0 5 10 15 20 25 Output Power (W) SBS threshold at 1064nm in 6.5m PLMA-YDF-10125 with 3m PM-DSF-10/125 delivery fiber on output \v flUFERN

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NuAmp CW Fiber Amplifiers -4

Single Frequency PM Amplifier Platform (2-15W) 5 700 600 500 400 300 200 10 ^4 0 «■►♦ ♦ ♦ ♦ ♦ ♦ 0 5 10 15 20 25 Output Power (W) Practical SBS limit in current gnration of PM single mode Yb and Er:Yb multi-stage amplifiers is ~20W (15W) at 1jim (1.5jim) X~\ tlUFERN

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NuAmp CW Fiber Amplifiers -6

Single Frequency PM Amplifier Platform (2-15W) 5 700 600 500 400 300 200 100 ♦ ♦ 0 5 10 15 20 25 Output Power (W) Multiple options available (isolation, control, input power, etc)

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NuAmp CW Fiber Amplifiers -7

Single Frequency PM Amplifier Platform (2-15W) 5 700 600 500 400 300 200 10 ^4 0 «■►♦ ♦ ♦ ♦ ♦ ♦ 0 5 10 15 20 25 Output Power (W) Mature platform, more than 50 amplifiers delivered over last 4 years

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NuAmp CW Fiber Amplifiers -8

Single Frequency PM Amplifier Platform (2-15W) Specially designed Yb doped fibers with increased mode filed diameter but maintaining single mode spatial beam profile were used to alleviate the SBS limitation.

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NuAmp CW Fiber Amplifiers -9

Single Frequency PM Amplifier Platform (2-15W) SBS-suppression fibers were used to further decrease the SBS threshold.

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NuAmp CW Fiber Amplifiers -10

Single Frequency PM Amplifier Platform (2-15W) Optical Specifications NUA-UUUU-PV-0002-YZ NUA-UUUU-PV-0005-YZ Optical Spcification1 Output Power 2.0 W 5.0 W Output Power Adjustment (nominal) 10-100% 10-100% Power Stabi lity2 < 3.0% * 3.0% M Dde TEMa 黙DD Output Type No isolator, FC/APC connector No isolator, FC/APC connector Fiberto fiber Isolator, Fiberto fiber Isolator, FC/APC connector FC/APC connector Fiberto free space isolator Fiber to free space isolator In put Type FC/APC bulkhead FC/APC bulkhead Mode of Opration CW CW Polarisation Linear Linear PER at Rated Power3 > 15 dB &15dB Operating...

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NuAmp CW Fiber Amplifiers -11

Single Frequency PM Amplifier Platform (2-15W) Mechanical, Electrical &Environmental Specifications 1 AU specifications are at RI and proper heasmking is required. 'l Stabiiity is measured over 2-hour period & caicuiaed using (max-min)/Avg. 3 Measured with isoiator 4Custom OEM packaging avaifabie on reues t. qUFERN

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NuAmp CW Fiber Amplifiers -14

Single Frequency PM Amplifier Platform (40W at 1mm) By adopting state of the art PM LMA (25/400) fibers the SBS threshold can be raised to >40W (at 1 mm) with 5kHz seed source 80 > 70 o 60 i 50 0 Cl 40 « 30 O * 4 20 M O 10 m -20/400 ■25/400 1 80 0 M 0 20 40 60 Amplifier Output Power (W) ([UFERN

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NuAmp CW Fiber Amplifiers -18

Single Frequency PM Amplifier Platform (100W at 1mm) Practical SBS limit is increased in these PM LMA based amplifiers by using a temprature gradient along the active fiber length ^ 4UFERN

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NuAmp CW Fiber Amplifiers -19

Single Frequency PM Amplifier Platform (100W at 1mm) Temprature gradient shifts the local SBS gain spectrum along the fiber length flUFERN

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NuAmp CW Fiber Amplifiers -20

Single Frequency PM Amplifier Platform (100W at 1mm) Amp Measured Parameters Property Tested Value Output Power [~5kHz] 105.5 W PER >15.5 dB M2 <1.10 Wavelength 1064.4 nm Input Power ~ 33mW Max Backward Power < 25mW QUFERN

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NuAmp CW Fiber Amplifiers -21

Single Frequency PM Amplifier Platform (100W at 1mm) POWER with Oven Off Isa [A] Isb [A] PSIGNAL [W] Pback [mW] 10 10.4 0.25 20 33.0 0.55 30 61.1 23.0

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NuAmp CW Fiber Amplifiers -24

Single Frequency PM Amplifier Platform (100W at 1mm) Beam Propagation Factor 100W Mx2 = 1.08 MY2 = 1.09 qUFERN

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NuAmp CW Fiber Amplifiers -25

SBS Threshold Dpends on Linewidth of Seed Source SBS Threshold vs. Linewidth 800 700 600 500 JE 400 CL 300 200 100 0 0 1 234 Linewidth [GHz] 5 6 In some applications 1-10GHz linewidth is suitable (this signal linewidth reduces the SBS gain in the amplifier, which has linewidth ~50MHz) V

 Open the catalog to page 25
NuAmp CW Fiber Amplifiers -26

SBS Threshold Dpends on Linewidth of Seed Source SBS Threshold vs. Linewidth 800 700 600 500 JE 400 CL 300 200 100 0 0 1 234 Linewidth [GHz] 5 6 In those cases broadening the linewidth to achieve more output power is an acceptable compromise V

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NuAmp CW Fiber Amplifiers -27

SBS Threshold Dpends on Linewidth Seed Source SBS Threshold vs. Linewidth Linewidth [GHz] this case LMA fibers generate output power >1kW CW

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NuAmp CW Fiber Amplifiers -28

■ ■ ■ ■ (3GHz seed s 1 kW Amplifier 1000 800 a." 600 400 200 0 0 200 400 600 800 1000 1200 "launched pump [w] " 330mm j 390mm~ M2 = 1.1 Measured at 1 kW Multi-stage turn-key packed amplifier (1mW input power) qUFERN

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NuAmp CW Fiber Amplifiers -30

■ ■ ■ ■ (3GHz seed s 1 kW Amplifier 1000 800 a." 600 400 200 0 0 200 400 600 800 1000 1200 "launched pump [w] " 330mm j 390mm~ M2 = 1.1 Measured at 1 kW Linearly polarized option PER~13dB qUFERN

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NuAmp CW Fiber Amplifiers -31

■ ■ ■ ■ (3GHz seed s 1 kW Amplifier 1000 800 a." 600 400 200 0 0 200 400 600 800 1000 1200 "launched pump [w] " 330mm j 390mm~ M2 = 1.1 Measured at 1 kW Multiple units shipped 2008-2009 qUFERN

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NuAmp CW Fiber Amplifiers -32

High Power Single Frequency 1.5mm PM-LMA Amp PLMA-EYDF-25/300 Dichroic filters 300W 940nm bar diode ; 1060nm ASE 1550nm signal 50mW 1550nm single-frequency seed fiber laser, 5kHz linewidth qUFERN

 Open the catalog to page 32
NuAmp CW Fiber Amplifiers -33

High Power Single Frequency 1.5mm PM-LMA Amp PLMA-EYDF-25/300 Dichroic filters 300W 940nm bar diode ; 1060nm ASE 1550nm signal 10W PM single-frequency pre-amp (NuAMP) qUFERN

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NuAmp CW Fiber Amplifiers -34

High Power Single Frequency 1.5mm PM-LMA Amp PLMA-EYDF-25/300 Dichroic filters 300W 940nm bar diode ; 1060nm ASE 1550nm signal Amplified in Er:Yb PM LMA 25/300 fiber, counter pumped at 940nm qUFERN

 Open the catalog to page 34
NuAmp CW Fiber Amplifiers -41

Rcent Advances in Tm-fibers for 2 m m Wavelength

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NuAmp CW Fiber Amplifiers -42

Pump Options forTm-doped Fibers O o d> </) tfl o o ã O "55 LU ˣ O ■Emission Absorption Gain Spectral Rթgion O (0 < 700 1200 1700 Wavelength (nm) 2200 Rsonant pumping around 1560nm is difficult to power scale with direct diode pumping (no high power/brightness pumps) QUFERN

 Open the catalog to page 42
NuAmp CW Fiber Amplifiers -43

Pump Options forTm-doped Fibers O o d> </) tfl o o ã O "55 LU O ■Emission ■Absorption Gain Spectral R룩gion O < 700 1200 1700 Wavelength (nm) 2200 Solution here is to pump with Er:Yb fiber laser which is in turn pumped by 9xx high brightness diodes (>400W output power demonstrated, IPG 2007) QUFERN

 Open the catalog to page 43

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