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Group Delay Dispersion

Chameleon-Peak-Power-White-Paper.pdf

Chameleon-Peak-Power-White-Paper.pdf

…becomes in width, the larger the
bandwidth. This is important, because broad
bandwidth pulses display a phenomenon known as
group delay dispersion (GDD), when passed through a
complex optical system such as a multiphoton
microscope. Caused by the differing refractive index…

WP ChameleonPeakPower Final.pdf

WP ChameleonPeakPower Final.pdf

…becomes in width, the larger the
bandwidth. This is important, because broad
bandwidth pulses display a phenomenon known as
group delay dispersion (GDD), when passed through a
complex optical system such as a multiphoton
microscope. Caused by the differing refractive index…

Fidelity HP

Fidelity HP

…neurons, with precise spatial and temporal resolution. Short pulses are delivered directly to the sample plane by way of user adjustable group dispersion delay compensation (GDD). Industrial and commercial applications, such as two-photon polymerization, rapid prototyping and scribing, benefit from…

COHR WP PropagationDispersionMeasurement of sub 10fsPulses 08 29 18.pdf

COHR WP PropagationDispersionMeasurement of sub 10fsPulses 08 29 18.pdf


Group Delay, Group Velocity and Group Velocity Dispersion
Let's start with the Taylor expansion of the k vector to look at the different contributing factors:
() =
+

( -
) +

( -
) +

( -
) +

( -
) +
Group Velocity
The group velocity…

COHR CPC1040 DS 0616 5.pdf

COHR CPC1040 DS 0616 5.pdf

…Typical GDD Step Size (fs2) 3500
Transmission Efficiency (%) >85
Typical Negative GDD range (fs2) 8000 to 20,000
Typical Group Dispersion Delay Setting
GDD (fs2)
-26,000
-24,000
-22,000
-20,000
-18,000
-16,000
-14,000
-12,000

COHR Fidelity-2 DS 0618 4.pdf

COHR Fidelity-2 DS 0618 4.pdf

…1.1
Astigmatism (%) <10
Polarization Horizontal
Group Delay Dispersion (GDD) Pre-compensation Range (fs2) -30,000 to 0
FEATURES
Light-loop Power Stabilization
Integrated and Automated Pre-Chirp Dispersion Compensation
Fast Photodiode Output (trigger signal)

COHR RLScatalog2020 interactive.pdf

COHR RLScatalog2020 interactive.pdf

…±0.2
Beam Divergence (mrad) <1.6
Beam Circularity5 0.9 to 1.1
Astigmatism (%) <10
Polarization Horizontal
Group Delay Dispersion (GDD) Pre-compensation Range (fs2) -30,000 to 0
ELECTRICAL AND COOLING REQUIREMENTS
Voltage (V) 100 to 240
Current Max. (A)…

2016-Ultrafast-Laser-Systems-Catalog.pdf

2016-Ultrafast-Laser-Systems-Catalog.pdf

…±0.2
Beam Divergence5 (mrad) <1.6
Beam Circularity6 0.9 to 1.1
Astigmatism (%) <10
Polarization Horizontal
Group Delay Dispersion (GDD) Pre-compensation Range (fs2) -30,000 to 0
Voltage 100 to 240
Current Max. (A) 3
Line Frequency (Hz) 50 to 60

COHR RLScatalog 2017revA web.pdf

COHR RLScatalog 2017revA web.pdf

…±0.2
Beam Divergence5 (mrad) <1.6
Beam Circularity6 0.9 to 1.1
Astigmatism (%) <10
Polarization Horizontal
Group Delay Dispersion (GDD) Pre-compensation Range (fs2) -30,000 to 0
Voltage 100 to 240
Current Max. (A) 3
Line Frequency (Hz) 50 to 60

COHR WP ChameleonPeakPower 2018-08.pdf

COHR WP ChameleonPeakPower 2018-08.pdf

…a pulse becomes in width, the larger the bandwidth. This is important, because broad
bandwidth pulses display a phenomenon known as group delay dispersion (GDD), when passed
through a complex optical system such as a multiphoton microscope. Caused by the differing
refractive index of…

COHR FidelityHP DS 0117 2.pdf

COHR FidelityHP DS 0117 2.pdf

…neurons, with precise spatial and temporal resolution. Short pulses are delivered directly to the sample plane by way of user adjustable group dispersion delay compensation (GDD). Industrial and commercial applications, such as two photon polymerization, rapid prototyping and scribing, benefit from…

Higher Power Nanosecond Lasers Cut Thicker Films, PCBs, and Flex Substrates

Higher Power Nanosecond Lasers Cut Thicker Films, PCBs, and Flex Substrates

…to enable complex two photon microscope configurations. Short pulse duration is key to high brightness/contrast images and is enabled by a group dispersion delay (GDD) pre-compensator with enhanced dynamic range. It avoids unwanted pulse stretching, even in wide field microscope setups using highly…