Abstract:
PURPOSE:To measure the retardation of a sample readily in a short time by measuring the distance FSR between the peaks of the transmittances of the same polarized light and the distance delta between the peaks of the transmittances of the different polarized lights, and obtaining the retardation of the sample based on the result of the comutation of pi delta/FSR. CONSTITUTION:In this convention, there are following devices. A resonator RS comprises a pair of facing mirrors 4 and 6 having the high reflectivities. Variable means 6,10,11 and 12 can change the length of the optical path between a pair of the mirrors 4 and 6 of the resonator RS. A single-model laser 1 which emits input laser light is provided at one end of the optical axis of the resonator RS. A photodetector 9 detects the output laser light from the other end of the resonator. The distance FSR between the peaks of the transmittances of the same polarized light when a sample 5 is provided at the optical path of the resonator RS and the distance delta between the peaks of the transmittances of the different polarized lights are measured. The retardation of the sample is obtained based on the result of the computation of pi delta/FSR.
Abstract:
PURPOSE:To enable high-precision and wide-range measurement of an optical loss of a sample by a simple construction by determining free spectral ranges and transmission peak widths of a resonator in the cases when the sample is disposed in the optical path of the resonator and when it is not disposed therein. CONSTITUTION:A measuring apparatus is constructed of a resonator RS composed of a pair of mirrors 4 and 6 of high reflectivity facing each other, a variable means composed of a high-voltage amplifier 10 making variable an optical path between the mirrors 4 and 6 of the resonator RS, a function generator 11 and a piezoelectric element 12 fitted on the back of the mirror 6, a single-mode laser 1 applying an input laser light onto one end side on the optical axis of the resonator RS, and a photodetector 9 detecting an output laser light from the other end side of the resonator RS. Free spectral ranges and transmission peak widths of the resonator RS in the cases when a sample 5 is disposed in the optical path of the resonator RS and when it is not disposed therein are obtained from a detection output of the photodetector 9, and an optical loss of the sample is determined from the values thereof.
Abstract:
PURPOSE:To improve coherency by employing as an output laser beam a laser beam component having a frequency of the sum obtained by coupling an oscillation laser beam of a solid laser and a laser beam for converting the wavelength of a semiconductor laser. CONSTITUTION:When a first laser light LA2 obtained from a solid laser 4 and a second laser light LA1 obtained from a semiconductor laser 1 are coupled by a nonlinear optical crystalline element 6, a composite light containing the sum frequency light component of the first laser light LA2 and the second laser light LA1 from the element 6 is obtained. Accordingly, the sum frequency light component is radiated as the output laser light LA3, and a laser beam having substantially similar to the optical characteristic to that the of the solid laser and a wavelength shorter than that of the laser beam LA2 can be easily generated.
Abstract:
PROBLEM TO BE SOLVED: To provide a coupler termination device which can reduce the EMI.SOLUTION: The coupler termination device comprises: a first termination which is connected to a transmitter operating at a first frequency and has a resonant frequency equal to a second frequency; and a second termination which is connected to a receiver operating at the first frequency and has a resonant frequency equal to a third frequency. If the second and/or third frequencies are substantially separated spectrally from the first frequency and the first and second terminations are brought into close proximity to and engaged with each other, then an equivalent resonant frequency is substantially the first frequency.
Abstract:
PROBLEM TO BE SOLVED: To reduce propagation loss at a wide range of frequencies by replacing a microstrip line (MSL), whose loss increases with frequencies, by a dielectric waveguide.SOLUTION: A system for inter-chip RF communication is mounted on a PCB, and has a dielectric waveguide 22 made of a dielectric material. The system has couplers 24, 26 at respective ends 32, 34 of the dielectric waveguide 22. The couplers 24, 26 couple the dielectric waveguide 22 with signal sources 28, 30, respectively. The dielectric waveguide 22 is, on the PCB, printed, embossed, cut or pre-prepared.
Abstract:
PROBLEM TO BE SOLVED: To provide a wavelength conversion device capable of keeping high efficiency of wavelength conversion for a longer time than that in the prior art. SOLUTION: When performing wavelength conversion of a second harmonic wave L2 in a fourth harmonic wave generating part 14, the incident position of the second harmonic wave L2 is relatively displaced in a direction including a projection direction component C1 of +C axis to the incident plane S1 in a BBO crystal 142 in the incident plane S1. Thereby, for example, when the BBO crystal 142 is deteriorated due to absorption of a fourth harmonic wave L4 in a deep ultraviolet area, the efficiency of wavelength conversion in the fourth harmonic wave generating part 14 is efficiently recovered. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To solve problems of correct setting of resonator length and parallelism between a reflection plane and an output coupler, in an unstable resonator in which at least one of the reflection plane and the output coupler has a flat surface or a very gentle curvature surface. SOLUTION: The unstable resonator is provided with a parallelism adjusting device 10 which adjusts optical parallelism between the reflection plane 7 and the output coupler 6. The parallelism adjusting device 10 is constituted by a holding member 11 which holds the output coupler 6, and a holding member 12 which holds the reflection plane 7. Wherein, on the holding members 11 and 12, a first fitting surface 11A and a second fitting surface 12A are formed respectively, so as to be abutted each other by one and the other of a concave spherical surface and a convex spherical surface having the same curvature, or one and the other of a concave conical surface and the convex spherical surface, and by mutually sliding and swinging both fitting surfaces while abutting them, the resonator length is accurately set, and the parallelism between the reflection plane and the output coupler is adjusted. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a laser beam generator capable of generating a laser beam of substantially continuous wave stably and efficiently, without complicating the structure or increasing the size. SOLUTION: A first laser oscillator 10 generates a pulsed light Pul of repetition frequency fp. A second laser oscillator 20 is pumped by the pulsed light Pul from the first laser oscillator 10. More specifically, the first laser oscillator 10 generates a pulsed light Pul of repetition frequency fp which is higher than the relaxed oscillation frequency fr of the second laser oscillator 20 which is pumped by the pulsed light Pul to deliver a laser beam CW of substantially continuous wave having a pulse duty ratio higher than that of the pulsed light. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To realize stable locking and to evade accompaniment of rise of cost and increase of power consumption for the purpose in a laser light generator having a plurality of resonators. SOLUTION: In the laser light generator 1, a laser light source 2, a phase modulator 3 and a signal generator 7 to impress a modulation signal on it and the resonators 5- X (X=1, 2, etc.), are provided. And nonlinear optical elements 8 are provided in a resonator 5- 1 and an optical path length varying means 9 to vary length of optical paths of the respective resonators is provided. A control circuit 11 of negative feedback structure regarding control of length of the resonators is formed by obtaining error signals by using detection signals of photodetectors 6- X (X=1, 2, etc.), to receive light from the respective resonators and controlling the optical path length varying means 9 according to an FM side band method. The laser light generator is constituted so that laser light is made incident on the resonator 5- 1 after phase modulation is given to it, light to be generated by the nonlinear optical element 8 is made incident on a resonator 5- 2 and the plurality of resonators are simultaneously held as a resonated state.
Abstract:
PROBLEM TO BE SOLVED: To prolong the life of a semiconductor exposure device, etc., by obtaining laser light of high repetitive frequency and