Laser light source and photoelectron microscope

Abstract

The invention provides a laser light source with high energy and high output and a photoelectron microscope using the laser light source. A laser light source (2) for a photoelectron microscope for emitting quasi-continuous wave laser light (7) is provided with: a first laser light source (100) for emitting continuous wave coherent light (100a); an optical resonator (110) having an optical path for circulating the continuous wave coherent light (100a) and a nonlinear optical element (114) disposed on the optical path; and a quasi-continuous-wave light source (120) that emits quasi-continuous-wave coherent light (120a) having a shorter wavelength than the continuous-wave coherent light (100a) and an approximately rectangular output waveform, and when the quasi-continuous-wave coherent light (120a) is incident on the nonlinear optical element (114) from outside the optical resonator (110) in a state in which the continuous-wave coherent light (100a) is incident on the optical resonator (110) and circulates in an optical path, the quasi-continuous-wave light source (120) emits quasi-continuous-wave coherent light (120a). Quasi-continuous wave laser light (7) having a shorter wavelength than the quasi-continuous wave coherent light (120a) is emitted from the nonlinear optical element (114).

Description

technical field [0001] The invention relates to a laser light source and a photoelectron microscope. Background technique [0002] There is known a photoelectron microscope that irradiates a sample with high-energy laser light as excitation light, detects photoelectrons released from the sample, and forms an image. A photoelectron microscope is an electron projection type microscope that magnifies and images photoelectrons released from a substance by irradiating excitation light. The technique is used for chemical mapping and magnetic imaging of materials, resulting in a spatial resolution of about 20 nm. In particular, if excitation light with photon energy greater than the work function is used as the excitation light, a contrast strongly dependent on the magnitude of the work function can be obtained, and conductivity, valence, crystallinity, magnetism, etc. can be visualized. [0003] In this way, the photoelectron microscope is a device capable of two-dimensionally v...

AI Technical Summary

Problems solved by technology

As a result, there is a problem that the resonator cannot oscillate and emit the second laser light, causing the laser device to stop

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