42results about How to "Increase cavity length" patented technology

An interference display unit with a first electrode, a second electrode and posts located between the two electrodes is provided. The characteristic of the interference display unit is that the second electrode's stress is released through a thermal process. The position of the second electrode is shifted and the distance between the first electrode and the second electrode is therefore defined. A method for fabricating the structure described as follow. A first electrode and a sacrificial layer are sequentially formed on a substrate and at least two openings are formed in the first electrode and the sacrificial layer. A supporter is formed in the opening and the supporter may have at least one arm on the top portion of the supporter. A second electrode is formed on the sacrificial layer and the supporter and a thermal process is performed. Finally, The sacrificial layer is removed.

An interference display unit with a first electrode, a second electrode and posts located between the two electrodes is provided. The characteristic of the interference display unit is that the second electrode's stress is released through a thermal process. The position of the second electrode is shifted and the distance between the first electrode and the second electrode is therefore defined. A method for fabricating the structure described as follow. A first electrode and a sacrificial layer are sequentially formed on a substrate and at least two openings are formed in the first electrode and the sacrificial layer. A supporter is formed in the opening and the supporter may have at least one arm on the top portion of the supporter. A second electrode is formed on the sacrificial layer and the supporter and a thermal process is performed. Finally, The sacrificial layer is removed.

The invention is concerned with stabilized frequency method and equipment of double longitudinal modes laser based on thermoelectric cooler. The stabilized frequency method is piezoelectric ceramics, and so on. Detect the circumstance temperature T0 of laser to confirm heat balance temperature Tset, start electrical source of laser to test current temperature Treal of laser tube at real time. Adjust countercurrent I according to different value between current temperature Treal and heat balance temperature Tset and heat up laser tube to keep temperature arrive to Tset. Detect optical power Pm and Pm+1of m order and m+1order on the mutual vertical polarization direction to laser and count the different valueDeltP of the two powers. When the temperature of laser tube is near to heat balance temperature Tset, afford forward or counter current to thermoelectric cooler according to the forward or counter to the different valueDeltP, keep the symmetry of two longitudinal mode laser frequency and make the different valueDeltP close to zero, by controlling the temperature of laser tube, the length of resonant cavity and laser longitudinal mode frequency. The two longitudinal mode frequencies are steady, and this product is fit for stabilized frequency.

The present invention relates to a laser sensor for self-mixing interferometry. The laser sensor comprises at least one semiconductor laser light source emitting laser radiation and at least one photodetector (6) monitoring the laser radiation of the laser light source. The laser light source is a VECSEL having a gain medium (3) arranged in a layer structure (15) on a front side of a first end mirror (4), said first end mirror (4) forming an external cavity with an external second end mirror (5). The proposed laser sensor provides an increased detection range and can be manufactured in a low-cost production process.

The invention discloses a continuous wave optical parametric oscillator with pumping resonance. The continuous wave optical parametric oscillator with the pumping resonance comprises a single frequency pump laser, a beam collimating unit, a first optical isolator, a pump input coupling mirror, a first concave mirror, a nonlinear crystal, a second concave mirror, a dichroic mirror, an optical band pass wave filter and an OPO signal light output coupling mirror. According to the continuous wave optical parametric oscillator, the non-linear crystal is directly placed between the two concave mirrors, and a smaller signal and a spot area of the pump light can be obtained by selecting the concave mirror with short focal length; the cavity length of the signal cavity and the pumping cavity is increased with a folded resonator. Therefore, the spot area of the signal and pump light in the non-linear crystal can be further reduced, and the extremely low oscillation threshold is realized, wherein the oscillation threshold value can be less than 60 MW, or even less than 30 MW. The continuous wave optical parametric oscillator with a low threshold value has the advantages of reducing the power requirement of the pump laser, being relatively simple in structure, and easy to realize miniaturization and practicability.

The invention relates to an anti-detuning long-pulse-width corner-cone cavity solid-state laser. In the structure of the laser, four corner-cone prisms are used to form a ring resonator. One of the wave plates makes the intracavity oscillating beam repeatedly reflected between the four corner cubes, which can significantly increase the cavity length of the resonator under the same laser volume, and at the same time ensure the anti-detuning characteristics of the laser resonator.

The invention is a novel folded cavity laser with opposed corner cubes, which utilizes the reflection characteristics of the opposed corner cubes to make resonant beams reflect back and forth between the two corner cubes, which can effectively increase the cavity length of the resonant cavity; the invention The laser can significantly increase the cavity length in a small space, while ensuring the anti-offset characteristics of the laser resonator.