Coherence

• Coherence-0.mp3
• Coherence-0.mp4
• Coherence-I.mp3
• Coherence-I.mp4
• Coherence-Interlude-Reprise.mp3
• Coherence-Unplugged-Underground-XIII.mp3
• Coherence-Unplugged-Underground-XIII.mp4
• Coherence-Unplugged.mp3
• Coherence-Unplugged.mp4
• Coherence-intro.mp3

[Intro]
In phase…
(We move together)
Together in a precise direction
Through haze
(In spite of whether)
Together, in phase perfection

[Verse 1]
The eye of I
(With a laser focus)
Can see to we
(Encompass us)

[Chorus]
Coherence
(Stay concentrated)
Coherence
(Say articulated)

[Bridge]
In phase…
(We move together)
Together in a precise direction
Through haze
(In spite of whether)
Together, in phase perfection

[Verse 2]
Is it just a phase
(We’re going through)
Or, can we raise (raise, raise)
(And get into…)

[Chorus]
Coherence
(Stay concentrated)
Coherence
(Say articulated)

[Bridge]
In phase…
(We move together)
Together in a precise direction
Through haze
(In spite of whether)
Together, in phase perfection

[Outro]
Our long distance relationship
Has set sail

A SCIENCE NOTE
A laser can start a fire similarly to a magnifying glass but through a different mechanism. Here’s how a laser focuses light and how it can ignite a material:

How a Laser Focuses Light

1. Monochromatic Light:
   • A laser emits light at a single wavelength (color), unlike sunlight, which contains multiple wavelengths. This makes laser light monochromatic.
2. Coherence:
   • Laser light is coherent, meaning the light waves are in phase and move together in a precise direction. This coherence prevents the light from spreading out and allows it to stay concentrated over long distances.
3. Collimation:
   • Laser beams are highly collimated, meaning the light rays travel nearly parallel to each other. This minimizes divergence and ensures the beam remains focused.
4. Focusing Lens:
   • To ignite a material, a lens or focusing element can concentrate the laser beam into a small spot. This increases the energy density (power per unit area) at the focal point, similar to how a magnifying glass focuses sunlight.

How Lasers Start Fires

1. Energy Intensity:
   • A laser delivers energy in the form of light to a material. The focused spot has a high power density (measured in watts per square millimeter or centimeter).
   • For example, a 1-watt laser focused on a spot 1 mm² can deliver 1 watt per square millimeter—much higher than the diffuse energy of sunlight.
2. Material Absorption:
   • The material must absorb the laser light. Dark, rough materials absorb more energy and heat up faster, just like with a magnifying glass.
   • Lasers tuned to certain wavelengths can target specific materials. For example, a CO₂ laser emits infrared light, which is highly absorbed by organic materials like wood or paper.
3. Heating to Ignition:
   • As the material absorbs energy, its temperature rises. If it reaches its ignition temperature, it combusts, starting a fire.

Key Differences Between a Laser and a Magnifying Glass

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