1. Given that the output power from the laser is cavity length, and Li is the i loss of the cavit...
2. A Q-switched laser uses a cavity with a length of 1m and an average mirror reflectivity of r 0.9 The gain medium is an Nd:YAG crystal, which is pumped by a flashlamp. a) What is the cavity loss time ignoring losses in the gain medium and approximating the refractive index of the cavity as near unity? b) What is the quality factor (Q)? c) Draw the optical configuration in the laser cavity for a quarter wave electro-optical q-switch for...
(a) The optical gain coefficient of a semiconductor laser with 150 μm cavity length is shown in Fig 1. The loss coefficient and the refractive index of the semiconductor laser are 21.6 cm" and 3.5 respectively. Find (i)The minimum gain coefficient required for lasing (ii) The frequency separation between the longitudinal modes of the laser (iii) The number of longitudinal modes emitted (b) This laser is required to produce a single mode output at a wavelength of 1.32 unm If...
2. A Q-switched laser uses a cavity with a length of 1m and an average mirror reflectivity of r = 0.9. The gain medium is an Nd:YAG crystal, which is pumped by a flashlamp. a) What is the cavity loss time ignoring losses in the gain medium and approximating the refractive index of the cavity as near unity? b) What is the quality factor (Q)? c) Draw the optical configuration in the laser cavity for a quarter wave electro-optical q-switch...
13.5. Given the spot size at mirror (w,)and at mirror 2 (w,) for a cavity of len mirror 2 (w,) for a cavity of length (d) and a laser beam of wavelength (). a) Show that the stability parameters of the cavity are given by, and g2- b) Determine the radii of curvature (R, and R,) of the mirrors of an argon laser cavity operating at 514.5 nm and has a length of 1.4 m, if the spot size at...
A laser having an internal loss per round-trip of 0.015, when pumped at three times threshold, has an output power of 4 W. The optical mode in the laser has diameter 1 mm. (a) Determine the output mirror transmission that maximizes the output power of this laser. (b) Determine the saturation intensity of the laser transition.
A semiconductor laser has an optical cavity length of 350 um and an index of refraction of 3.4. (a) At what wavelengths near 1.55 um would you expect this laser to emit optical output power? (2 marks) (b) What is the spacing, in um, between these different modes of the laser output? (1.5 marks)
4. (a)A GaAlAs laser diode has a 500 micron cavity length which has an effective absorption coefficient of 10 cm . For uncoated facets the reflectivities are0.32 at each end. What is the optical gain at the lasing threshold? (b) If one end of the lasers is coated with a dielectric reflector so that its reflectivity is now 90%, what is the optical gain at the lasing threshold? -1 Notice that required gain to overcome the loss can be reduced...
(c) A laser diode operating at 1,064nm has an internal cavity loss (a) of 200 m and facet reflectivities (R1) of 0.5 and (R2) 0.99, as shown in Fig. 4a. The distance between two facets (L) is Imm. Assume that the laser output is well collimated and has a perfect Gaussian profile with a beam diameter of 5 mm. What is the threshold gain coefficient? (4 points) R₂ R1 L Figure 4(a). (d) Brewster windows are transparent thin plates which...
Q5) Optical cavity. Frequency spacing between succesive modes of a cavity is given by JAvl c/(2nL). a. Use c-λν to show that wave length spacing between succesive modes of a cavity is lan-R/(2n L). b. An Argon gas laser has a gain region of 1.0 m length. The light emission by Argon atoms covers a frequency range of 3.3 GHz. The index of refraction of Argon gas is 1. How many modes can lase simultaneously in this Argon laser? c....
What is the length of a Q-switched pulse from a 10-cm long neodymium-glass laser with a 90% reflective output mirror? Assume that the refractive index of glass is 1.5. Answers: A. 20 nanoseconds B. 1 microsecond C. 1 nanosecond D. 5 nanoseconds E. 10 nanoseconds