Laser Focused

• Neon-helium gas
• Silver coating
• Aluminum oxide crystal may sound like the active material, but it is only the rod material. B) Silver coating is not the active material, but rather a component of the laser design. D) Neon-helium gas is a type of continuous wave laser, not the active material in a ruby laser.
• Chromium ions (correct)

• The contents of chromium (correct)
• The contents of neon-helium gas
• The contents of silver coating
• Aluminum oxide is the rod material, not the color determinant. B) Silver coating is not related to the color of the crystal. C) Neon-helium gas is not related to the color of the crystal.

• Continuous wave laser has a shorter wavelength than pulse laser
• Continuous wave laser is only used in medical applications
• Pulse laser emits light in short bursts while continuous wave laser emits light continuously (correct)
• Frequency is not the distinguishing factor between the two types of lasers. B) Continuous wave laser has various applications beyond medical use) D) Wavelength is not the distinguishing factor between the two types of lasers.