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KMLabs Femtosecond Amplifiers	Dragon	Dragon-HE	RedDragon
Number of Amplification Stages:	One Stage	One Stage	Two Stage
Repetition Rate:	1kHz to 20kHz	1kHz to 3kHz	1kHz to 20kHz
Energy / Power at 1kHz:	2.5mJ / 2.5W	5.0mJ / 5.0W	18mJ / 18W
Energy / Power at 3kHz:	2.0mJ / 6.0W	2.0mJ / 6.0W	10mJ / 30W
Energy / Power at 5kHz:	1.5mJ / 7.5W	--	6.0mJ / 30W
Energy / Power at 10kHz:	1.0mJ / 10W	--	3.0mJ / 30W
Energy / Power at 20kHz:	0.25mJ / 5W	--	1.0mJ / 20W
Pulse Duration:	<30fs, <25fs [1] , 100fs [1]	<40fs	<25fs
Beam Quality: [2]	M² < 1.5	M² < 1.5	M² < 1.5
ASE Intensity Contrast:	>10,000,000:1	>10,000,000:1	>10,000,000:1
Pre-pulse contrast on ns scale: [3]	>1,000:1	>1,000:1	>1,000:1
Post-pulse contrast on ns scale: [4]	>100:1	>100:1	>100:1
Contrast on sub-ps scale (at ~500fs):	>1,000:1	>1,000:1	>1,000:1
Contrast on sub-ps scale (at ~270fs):	>300:1	>300:1	>300:1
Polarization:	Horizontal "p"	Horizontal "p"	Horizontal "p"
Polarization purity:	>100:1	>100:1	>100:1
Power instability: [5]	<1% RMS	<1% RMS	<1% RMS
Long term instability (8hrs): [5]	<1% RMS	<1% RMS	<1% RMS
Beam pointing instability: [5]	<20urad	<20urad	<20urad
Cryogenic coolant (each crystal): [6]	Closed Loop HE Gas	Closed Loop HE Gas	Closed Loop HE Gas
Beam Diameter (1/e²): [7]	~1cm	~1cm	~2.2cm
Amplifier Footprint (cm):	60 x 180	60 x 180	(60 x 180) + (60 x 120)
Electronics Rack (cm, W x D x H):	54 x 63 x 64	54 x 63 x 64	54 x 89 x 130
Cryo Compressor(s) (cm, W x D x H):	varies	59 x 54 x 66	varies

Not all of these repetition rates and max per pulse energies are achievable with a single pump laser.
[1] = Available option, contact KMLabs for associated energy specifications.
[2] = Lower M2 available with reduced energy specifications.
[3] = >1,000,000:1 available as an option at 10% decrease in energy.
[4] = >100,000:1 available as an option at 10% decrease in energy.
[5] = With approved pump laser.
[6] = Approximately 50 Kelvin.
[7] = Contact KMLabs if alternate diameter is required.

The RedDragon TM is KMLabs' high power, two-stage laser amplifier system, compatible with many different pump lasers operating between 1 and 20kHz.

2w, 3w, and OPA options are now available for the Dragon series of amplifiers. Please contact KMLabs for details.

The RedDragon employs KMLabs' cryogenically-cooled Dragon as the first stage of amplification, as well as cryogenic cooling in the second amplification stage. Employing our patented technology in the first stage of amplification, KMLabs ensures repetition rate flexibility for our multistage systems, as well as our single-stage systems.

By contrast, systems that employ cryogenic cooling only within second and subsequent amplification stages suffer from thermal lensing within the first stage amplification crystal, just as an uncryo-cooled single stage amplifier would. Thermal lensing within the first amplification stage prevents real time changes in repetition rate or pump power.

With complete cryo-cooling, the KMLabs RedDragon laser systems can be used over wide repetition rate ranges, without any optical adjustment required.

For example, KMLabs can provide sub-25fs, RedDragon laser systems producing:

20mJ at 1kHz, and 1mJ at 10kHz, from a single system, with no optical realignment necessary, as you change from 1-10kHz.

KMLabs has also shipped RedDragon systems producing:

3mJ at 10kHz, and 1mJ at 20kHz, from a single system, with no optical realignment necessary, as you change from 10-20kHz.

RedDragon Features:

- Unique, cryogenic cooling of the ti:sapphire crystal (US Patent #: 6,804,287) allows for a compact design that nearly doubles the optical amplification in each crystal.
- Cryogenically cooling each crystal reduces the thermal lens by a factor of 250 at 100W of pump. This makes the optical alignment insensitive to the pump power, and thus allows real-time change of the repetition rate, without optical realignment.
- Closed-loop, helium-gas-based cryogenics are hands-off, fully interlocked, and require minimal user-maintenance.
- Ultrahigh vacuum (1x10-8Torr) protects each crystal using a sealed, internal ion pump that requires minimal user maintenance.
- Comprehensive, fully integrated system diagnostics make the RedDragon a user-friendly amplification system, providing reference data for real time assistance with spatial, spectral, and energy optimization. Extensive data logs allow remote observation of system configuration for diagnostic assistance.
- Available with carrier envelope phase stabilization.
- Repetition rate stabilization is available when seeded with the KMLabs' Halcyon, repetition rate stabilized ti:sapphire oscillator.

RedDragon Options:

•  Motorized separation of the compressor gratings.
•  Motorized translation of the stretcher grating.
•  Motorized rotation of the compressor gratings.
•  Enhanced nanosecond contrast.
•  Repetition rate stabilization.
•  Carrier envelope phase stabilization.

See the KMLabs Dragon, for additional information.