Why is it difficult to get a 632 nm red laser diode (but you can get...

Why is it difficult to get a 632 nm red laser diode (but you can get a 637 nm one easily?

Why are red laser diodes cheaper than green ones or blue ones?

Expert Solution

The process to get 632nm red diode laser is too expensive and also its a challenge to get material which has bandgap of this no.

In a 640nm red laser pointer, there's a red-emitting diode and a lens to focus the beam.
In a 532nm green laser, there's a BIG infrared laser diode that generates laser light at 808nm, this is fired into a crystal containing the rare-earth element "neodymium". This crystal takes the 808nm infrared light and lases at 1064nm. This 1064nm laser light comes out of the NdYV04 (neodymium yttrium vanadium oxide) crystal and is then shot into a second crystal (containing potassium, titanium, & phosphorus, usually called KTP) that doubles the frequency to 532nm - the bright green color you see. This light is then focused by a lens and emerges out . Just before the lens, there's a filter that removes any stray infrared rays from the pump diode and the neodymium crystal.This is why green diode lasers are so much more expensive than red

genius_generous answered 2 years ago

6- You have a laser diode operating at 850 nm and capable of coupling 1 m...

6- You have a laser diode operating at 850 nm and capable of coupling 1 m W into a fiber, N sections of cable each of which is 500 m long, has 0.5 dB/km attenuation, and has connectors on both end. Each connector has a connector loss 0f 1.0 dB/connector. Also, you have a PIN photodiode receiver and an avalanche photodiode receiver. Using these components, you wish to construct a 7km link operating at 20Mb/s. If the sensitivities of the...

1. What is diffraction? 2. Diode laser light ( λ = 670 nm) falls on single...

1. What is diffraction? 2. Diode laser light ( λ = 670 nm) falls on single slit with the width of slit 0.04 mm. If a screen is 1.05 m away from the slit, what is Δy1↔1 the distance between the first dark (m=1) above the central bright and the first dark (m=1) below the central bright? 3. What is interference? 4. Diode laser light ( λ = 670 nm) falls on double slits spaced 0.25 mm. If a screen...

Consider a 1550 nm laser diode with a rise time of 0.8 ns, spectral half-width of...

Consider a 1550 nm laser diode with a rise time of 0.8 ns, spectral half-width of 6 nm, that launches 2 mW optical power into a 60 km long single-mode fiber with an attenuation of 0.3 dB/km. The intramodal dispersion is 3 ps/nm.km. An InGaAs APD with a -32 dBm sensitivity is used at 2.5 Gb/s (NRZ coding). A short optical jumper cable at each end of the cable with a loss of 3 dB is used to connect the...

Consider a Fabry–Perot semiconductor laser diode operating at 1550 nm. The active region is a III–V...

Consider a Fabry–Perot semiconductor laser diode operating at 1550 nm. The active region is a III–V quaternary semiconductor alloy of InGaAsP (but quite close to being InGaAs). The LD has a cavity length of 250 μm. The refractive index of InGaAsP is approximately 3.60 and dn/dT = 2.5 * 10^-4 K^-1, the linear thermal expansion coefficient is 5.6 * 10^-6 K^-1. The bandgap of InGaAs follows the Varshi equation Eg = Ego - AT^2>(B + T) with Ego = 0.850...

Red laser light with a wavelength of 633 nm shines on a surface with destructive interference...

Red laser light with a wavelength of 633 nm shines on a surface with destructive interference for that wavelength. The surface will appear: 1. white. 2. violet. 3. red. 4. black.

A double slit experiment is conducted with a red laser with wavelength l = 700 nm....

A double slit experiment is conducted with a red laser with wavelength l = 700 nm. The distance between the slits and the viewing screen is L = 2.00 m. Consider two experiments that have different slit spacings: Experiment A with dA = 2.00 μm and Experiment B with dB = 40.0 μm. For each experiment, calculate the following (be sure to keep at least three significant figures in all your intermediate calculations): a) Using Δr = d sinθ ,...

Why does the laser get a unique wavelength?

Light from a red laser (650 nm) is incident on two slits separated by 0.5 mm....

Light from a red laser (650 nm) is incident on two slits separated by 0.5 mm. Each slit is 0.25 mm wide. Quantitatively sketch the pattern you would observe on a screen that is located 2.0 m from the slits. Your sketch should range from -10 mm to 10 mm and include only the fringes you would observe. (Label the locations of the fringes) PLEASE EXPLAIN THOROUGHLY!!!!

We aim a red (620 nm) laser onto a small screen that has two slits that...

We aim a red (620 nm) laser onto a small screen that has two slits that are 0.1 mm apart. Each slit has a width of 0.03 mm.The light coming out of the two slits is projected onto a big screen a distance X from the slits. In the photo on the right you can see the pattern that’s visible on the big screen.Using a ruler, we determine that the distance between two adjacent bright spots is equal to 12...

A helium neon laser emits red light of wavelength 632.8 nm, which is obtained when neon...

A helium neon laser emits red light of wavelength 632.8 nm, which is obtained when neon atoms move from level 5s to level 3p. Given is a tube that contains 0.25 moles of a helium-neon mix, of which 15% are neon atoms. Also given is that while the laser is active, around 2% of the neon atoms are located at one of the two given energy levels at any time. a) what is the difference in energy between levels 5s...

Question