The radius of curvature of the output coupling mirror M1 100mm

 The sampling inspection plays an important role in predicting the quality of green laser pointer 
Green laser. Shanxi University Optoelectronics Research Changing Period, who designed the V cavity using of Nd: YVO4/LBO crystal combination, when the pump power of 23W, 7W single transverse mode 532nm green laser. Their experimental setup as shown below: primordial pumped by fiber-coupled maximum power output of 25W laser diode, fiber diameter of 200um, laser focusing system of the incident Nd: YVO 4 crystal, the spot diameter of about 600um, laser crystal size 3 x 3 x 8mm front surface plating 1064nm high anti-and 808nm antireflection film, plated 1064 antireflective coatings to reduce the oscillation laser cavity loss. The radius of curvature of the output coupling mirror M1 100mm.
green laser pointer needs to be inspected
The experimental setup is shown below. Pumping light converged after collimation focusing system into a diameter of 400um focused spot is injected into the work material internal radius of curvature of the output mirror M1 is 50 mm, concave-plated 946 nm high reflector (HR) film, 473 nm (AR anti- ) color film, the first two sub-arm all-trans mirror M2 radius of curvature of 200 mm, concave-plated 946 / 473nm the HR membrane. 1, arm length of 72 mm 2, arm length is 29 mm. Experiments in the gain medium Nd: YAG crystal (Φ4mm x 3mm) the left plated the 808 nmAR/946 nm, the HR membrane as an end mirror, plated 946 nm, the other end of the AR film. Multiplier device is Class I critical phase-matched LBO crystal (3 mm x 3 mm x 9 mm).There are not enough working personnel to inspect the quality of green laser pointer one by one
But only light amplification can not form the optical oscillation. As the electronic circuit of the oscillator, only the zoom function can not produce oscillations, must also design a positive feedback circuit, the power losses in the circuit to be compensated by the larger power. Similarly, the laser is also borrow the concept of the electronic circuit of the feedback, the amplified optical feedback part of the back to further enlarge the oscillation, issued by the laser. This used to achieve light amplification feedback instrument called optical resonator. The advantages of semiconductor lasers: small size, high coupling efficiency, fast response, wavelength and the size and fiber size adaptation can be directly modulated coherence.