WO2022124197A1 - 半導体レーザ素子、半導体レーザ装置、半導体レーザ装置の製造方法及びガス分析装置 - Google Patents
半導体レーザ素子、半導体レーザ装置、半導体レーザ装置の製造方法及びガス分析装置 Download PDFInfo
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Definitions
- the present invention relates to a semiconductor laser device, a semiconductor laser device, a method for manufacturing a semiconductor laser device, and a gas analyzer.
- This QCL-IR gas analyzer irradiates a sample containing a measurement target component with laser light from a quantum cascade laser, detects the laser light intensity transmitted through the sample with an optical detector, and detects the detection signal. It is used to analyze the component to be measured.
- the quantum cascade laser needs to control the oscillation wavelength to a wavelength suitable for the component to be measured and efficiently extract a single light at a desired oscillation wavelength, as shown in Patent Document 1, for example. Is used.
- a periodic diffraction grating corresponding to the oscillation wavelength is formed on the waveguide in order to extract a single light at a desired oscillation wavelength.
- the width dimension of the waveguide is made small (about twice or less of the oscillation wavelength) in order to improve the single mode of the laser light, the output (gain) of the laser light becomes small.
- the width dimension or the longitudinal direction of the waveguide is increased in order to increase the intensity of the laser beam, there is a problem that the single mode property of the laser beam is deteriorated. That is, in the width dimension of the waveguide, there is a trade-off relationship between the single mode of the laser beam and the optical output (gain).
- the width dimension or the longitudinal dimension of the waveguide is increased in order to increase the intensity of the laser beam, the power consumption required for the laser oscillation increases. Then, the temperature rise of the semiconductor laser element becomes large, the chirp ratio of the oscillation wavelength of the laser becomes large, and the resolution in gas analysis deteriorates.
- the inventor of the present application forms a diffraction grating portion in which the diffraction grating is formed and a flat portion in which the diffraction grating is not formed in the waveguide having the diffraction grating, as shown in FIG. By doing so, it was examined to increase the output (gain) of the laser beam by increasing the width dimension of the flat portion while improving the single mode property by reducing the width dimension of the diffraction grating portion.
- the present invention has been made to solve the above-mentioned problems, and its main problem is to increase the light output (gain) of a semiconductor laser device while stably outputting light in a single mode. Is to be.
- the semiconductor laser element according to the present invention is a semiconductor laser element having a diffraction grating formed on a waveguide, and the waveguide is formed with a diffraction grating portion on which the diffraction grating is formed and the diffraction grating.
- It has a connecting portion, and a high-reflection film is provided on the end surface of the flat portion opposite to the connection portion, and a low-reflection film is provided on the end surface of the diffraction grating portion on the side opposite to the connection portion. It is characterized by being.
- Such a semiconductor laser device has a diffraction grating portion having a small width and a flat portion having a large width, it is possible to increase the output (gain) of the laser light while improving the single mode property. .. Further, since the flat portion has a connection portion whose width changes continuously toward the connection portion with the diffraction grating portion, unintended reflection can be reduced and light in a single mode can be stabilized. Can be output. Further, since the high reflection film is provided on the end surface of the flat portion opposite to the connection portion and the low reflection film is provided on the end surface of the diffraction grating portion on the side opposite to the connection portion, the end surface of the diffraction grating portion is provided. It is possible to stably output single mode light from. As described above, since the end surface of the diffraction grating portion on the side opposite to the connecting portion serves as the light emitting surface, the single mode property can be further improved.
- connection portion is continuously narrowed toward the connection portion with the diffraction grating portion.
- the maximum width of the connection portion is equal to or less than the maximum width of the portion other than the connection portion in the flat portion, and the minimum width of the connection portion is equal to or more than the maximum width of the diffraction grating portion. Can be considered.
- the flat portion has a rectangular portion having a rectangular shape and the connection portion.
- connection portion between the diffraction grating portion and the connection portion in order to reduce unintended reflection between the diffraction grating portion and the connection portion or between the flat portion and the connection portion, the connection portion between the diffraction grating portion and the connection portion, and / Alternatively, it is desirable that the connection portion between the flat portion and the connection portion has an R shape.
- the connecting portion includes a tapered portion whose width is continuously narrowed toward the connection portion with the diffraction grating portion, the tapered portion, and the diffraction grating portion. It may have a narrow portion to be connected.
- the width dimension of the light emitting end of the waveguide is 1 to 2 times the oscillation wavelength.
- the area of the region where the diffraction grating is not formed is the region where the diffraction grating is formed. It is desirable that the area is equal to or larger than the area of.
- a first electrode for supplying a current to the diffraction grating portion and a second electrode provided separately from the first electrode for supplying a current to the flat portion can be controlled independently.
- the current flowing through the circuit grating can be reduced, the charp rate, which is the rate at which the oscillation wavelength changes when the current is passed in a pulse shape, is reduced, and the resolution when used in a gas analyzer is improved. Can be made to.
- connection portion When a diffraction grating is formed at the connection portion, the width of the region where the diffraction grating is formed changes, so that the light in the single mode may become unstable. Therefore, it is desirable that the connection portion is a region in which the diffraction grating is not formed. With this configuration, the single mode property can be further improved.
- the method for manufacturing a semiconductor laser element according to the present invention is a method for manufacturing a semiconductor laser element in which a diffraction grating is formed on a waveguide, and the diffraction grating region in which the diffraction grating is formed and the diffraction on the substrate.
- It includes a flat portion which is a region and has a region wider than the diffraction grating portion, and the flat portion has a region whose width changes continuously toward a connection point with the diffraction grating portion. It is characterized by comprising a waveguide forming step of forming a waveguide having a connecting portion.
- the semiconductor laser device is a semiconductor laser device including a substrate and a semiconductor laser element provided on the substrate, and the semiconductor laser element has a distribution in which a diffraction grating is formed on a waveguide.
- the waveguide is of a feedback type, and the waveguide has a diffraction grating portion in which the diffraction grating is formed and a flat portion having a region in which the diffraction grating is not formed and wider than the diffraction grating portion.
- the flat portion is characterized by having a connecting portion having a region whose width changes continuously toward a connecting portion with the diffraction grating portion.
- a gas analyzer that analyzes the component to be measured contained in the gas, the measurement cell into which the gas is introduced, the semiconductor laser device that irradiates the measurement cell with a laser beam, and the measurement cell. It is characterized by having an optical detector that detects the passed laser beam and an analysis unit that analyzes the component to be measured by using the detection signal of the optical detector.
- the semiconductor laser device it is possible to increase the light output (gain) while stably outputting the light in a single mode.
- FIG. 3 is a sectional view taken along line AA of the semiconductor laser device of the same embodiment. It is a top view which shows the waveguide of the semiconductor laser element of the same embodiment. It is a schematic diagram which shows the manufacturing method of the semiconductor laser apparatus of the same embodiment. It is a top view which shows the waveguide of the semiconductor laser element of a modification embodiment. It is a top view which shows the waveguide of the semiconductor laser element of a modification embodiment. It is a top view which shows the waveguide of the semiconductor laser element which is a comparative example of this invention.
- the semiconductor laser device 100 of the present embodiment is used for, for example, a gas analyzer 10 that analyzes a component to be measured in an exhaust gas discharged from an internal combustion engine.
- the gas analyzer 10 includes a multiple reflection type measurement cell 11 into which exhaust gas is introduced, a semiconductor laser device 100 that irradiates the measurement cell 11 with laser light, and light that detects laser light that has passed through the measurement cell 11. It has a detector 12 and an analysis unit 13 that analyzes a component to be measured by using the detection signal of the optical detector 12.
- the semiconductor laser device 100 emits a laser beam having an oscillation wavelength of ⁇ 1 cm -1 with respect to the absorption wavelength of the component to be measured, and as shown in FIGS. 2 and 3, a semiconductor such as an InP substrate is used. It has a substrate 2 and a semiconductor laser element 3 formed on the semiconductor substrate 2.
- the semiconductor substrate 2 provided with the semiconductor laser element 3 is housed in an airtight container 5 such as a butterfly package.
- a light guiding portion 51 for guiding the laser beam to the outside is formed at a portion of the semiconductor laser element 3 facing the light emitting surface 3x.
- the optical window member 6 is provided in the optical lead-out unit 51, and the optical window member 6 is slightly (for example, 2) so that the laser light reflected by the optical window member 6 does not return to the semiconductor laser element 3 again. Degree) Inclined.
- a cooling module 7 for cooling the semiconductor laser element 3 and the like are also housed in the airtight container 5.
- the semiconductor laser device 3 is of a distributed feedback type (DFB: Distributed Feedback), and is a waveguide composed of a clad layer and a core layer provided on the semiconductor substrate 2. It has 3L. In this waveguide 3L, light passes through the core layer due to the difference between the refractive index of the clad layer and the refractive index of the core layer.
- DFB Distributed Feedback
- the semiconductor laser device 3 has a buffer layer 31, a core layer 32, an upper clad layer 33, and a cap layer 34 formed on the upper surface of the semiconductor substrate 2 in this order. Further, all of these layers 31 to 34 extend in the same direction. Further, all of these layers 31 to 34 extend in the same direction, and the side surface in the width direction thereof is covered with the protective film 35 to form a waveguide 3L extending in one direction.
- the protective film 35 is an inorganic film, and may be, for example, a combination of SiO 2 or SiO 2 and Si 3 N 4 .
- the buffer layer 31 and the upper clad layer 33 are both layers made of InP.
- a lower clad layer made of InP may be provided between the buffer layer 31 and the core layer 32, or the buffer layer 31 may function as a clad layer.
- the cap layer 34 is a layer made of InGaAs, and a part of the upper surface thereof (central portion in the width direction) is covered with the upper electrode 91.
- the core layer 32 has a lower guide layer 321 made of InGaAs, an active layer 322 that emits light when an electric current is injected, and an upper guide layer 323 made of InGaAs.
- the active layer 322 has a multiple quantum well structure having a plurality of well layers, and is configured by alternately stacking a predetermined number of semiconductor layers serving as a light emitting region and semiconductor layers serving as an injection region.
- the semiconductor layer in the light emitting region is configured by alternately laminating InGaAs and InAlAs
- the semiconductor layer in the injection region is configured by alternately laminating InGaAs and InAlAs.
- a plurality of well layers are connected in multiple stages, and a quantum cascade that emits light by optical transition between subbands formed in the quantum wells. It is a laser.
- a diffraction grating 3M is formed between the core layer 32 and the upper clad layer 33, that is, on the upper guide layer 323 (see FIG. 4).
- the diffraction grating 3M is composed of concave portions and convex portions alternately formed in the upper guide layer 323, and the concave portions and convex portions extend in the width direction of the upper guide layer 323.
- the diffraction grating 3M intensifies light having a predetermined oscillation wavelength and selectively amplifies it.
- the predetermined oscillation wavelength is defined by the pitch of the diffraction grating 3M.
- a lower electrode 92 is provided on the lower surface of the semiconductor substrate 2 at a portion located below the semiconductor laser element 3. Then, by applying a current (or voltage) for laser oscillation to the upper electrode 91 and the lower electrode 92, a predetermined oscillation wavelength defined by the diffraction grating 3M is emitted.
- a current source (or voltage source) is connected to the upper electrode 91 and the lower electrode 92 for laser oscillation, and the laser control device 8 controls the current source (or voltage source) (see FIG. 2).
- the diffraction grating portion 301 in which the diffraction grating 3M is formed and the flatness in which the diffraction grating 3M is not formed are formed in the waveguide 3L. It has a unit 302.
- the diffraction grating portion 301 is for obtaining the predetermined oscillation wavelength, extends in a straight line along the longitudinal direction in a plan view, and has substantially the same width in the width direction orthogonal to the longitudinal direction. be.
- the diffraction grating 3M formed in the diffraction grating portion 301 is composed of concave portions and convex portions alternately formed between the core layer 32 and the upper clad layer 33, that is, the upper guide layer 323. ing.
- the width dimension of the diffraction grating portion 301 is configured to be 1 to 2 times the predetermined oscillation wavelength. With this configuration, the width dimension of the light emitting end of the waveguide 3L becomes 1 to 2 times the oscillation wavelength, and it is possible to efficiently emit single-mode light while suppressing transverse-mode oscillation.
- the flat portion 302 is for increasing the light output (gain), and is a region in which the above-mentioned diffraction grating 3M is not formed and is wider than the diffraction grating portion 301.
- the flat portion 302 of the present embodiment has a rectangular portion 302 m that is substantially rectangular in a plan view, and a connecting portion 303 whose width continuously changes toward the connection portion CP1 with the diffraction grating portion 301. is doing.
- the flat portion 302 is formed between the core layer 32 and the upper clad layer 33 by not forming concave portions and convex portions in the upper guide layer 323.
- the flat portion 302 has a connecting portion 303 whose width continuously changes toward the connection portion with the diffraction grating portion 301.
- the connecting portion 303 has a portion whose width gradually increases from the diffraction grating portion 301 toward the rectangular portion 302m, and in the present embodiment, the entire connecting portion 303 is formed from the diffraction grating portion 301 to the rectangular portion 302m.
- the composition is such that the width gradually widens toward. That is, the connecting portion 303 has a tapered shape from the rectangular portion 302 m toward the diffraction grating portion 301.
- the connection portion 303 has a configuration in which the width is continuously narrowed toward the connection portion with the diffraction grating portion 301.
- the width dimension of the connection portion 303 on the diffraction grating portion 301 side is the same as the width dimension of the diffraction grating portion 301, and the sides 303a on both ends in the width direction of the connection portion 303 are the sides on both sides in the width direction of the rectangular portion 302m. It is continuous with.
- the width dimension of the connecting portion 303 on the rectangular portion 302m side is the same as the width dimension of the rectangular portion 302m, and the sides 303a on both ends in the width direction of the connecting portion 303 are on both sides in the width direction of the diffraction grating portion 301. It is continuous.
- the maximum width of the connecting portion 303 is equal to or less than the maximum width of the portion of the flat portion 302 other than the connecting portion 303, and the minimum width of the connecting portion 303 is equal to or greater than the maximum width of the diffraction grating portion 301. It becomes. Further, the sides 303a on both ends of the connecting portion 303 in the width direction have a linear shape. Further, the connection portion 303 of the present embodiment is a region in which the diffraction grating 3M is not formed.
- connection point CP1 between the diffraction grating portion 301 and the connection portion 303 and / or the connection point CP2 between the rectangular portion 302m and the connection portion 303 may be R-shaped.
- the sides of the diffraction grating 301 on both sides in the width direction and the sides 303a on both sides of the connecting portion 303 in the width direction are connected in an arc shape
- the sides of the rectangular portion 302m on both sides in the width direction and the connecting portion 303 are connected in an arc shape.
- the sides 303a on both sides in the width direction of the above are connected in an arc shape.
- the area of the region where the diffraction grating 3M is not formed is configured to be equal to or larger than the area of the region where the diffraction grating 3M is formed. good.
- the end surface of the diffraction grating portion 301 on the opposite side to the connecting portion 303 is the light emitting surface 3x.
- a high-reflection film HR is provided on the end surface of the flat portion 302 (rectangular portion 302m) opposite to the connection portion 303
- a low-reflection film AR is provided on the end surface of the diffraction grating portion 301 on the side opposite to the connection portion 303.
- the light emission surface 3x is formed by providing the low reflection film AR on the end surface of the diffraction grating portion 301 opposite to the connection portion 303.
- the upper electrode 91 of the semiconductor laser element 3 is provided separately from the first electrode 91a for supplying a current to the diffraction grid portion 301 and the first electrode 91a, and is provided on the flat portion 302. It has a second electrode 91b for supplying an electric current.
- an InP layer to be a buffer layer 31 On the upper surface of the semiconductor substrate 2, an InP layer to be a buffer layer 31, an InGaAs layer to be a lower guide layer 321 and an InGaAs layer and an InAlAs layer to be an active layer 322, and an InGaAs layer to be an upper guide layer 323 are formed by an organic metal vapor phase growth method. Laminate by (MOVPE method).
- a diffraction grating region 323x in which the diffraction grating 3M is formed by photolithography and wet etching, and a flat region 323y in which the diffraction grating 3M is not formed are formed on the upper surface of the upper guide layer 323.
- the InP layer to be the upper clad layer 33 and the InGaAs layer to be the cap layer 34 are laminated on the upper part of the upper guide layer 323 by the organic metal vapor phase growth method (MOVPE method).
- a laminated structure having a diffraction grating region 323x on which the diffraction grating 3M is formed and a flat region 323y on which the diffraction grating 3M is not formed is formed (structure forming step).
- Etching is performed on the laminated structure thus formed to form a waveguide 3L.
- it has a diffraction grating portion 301 in which the laminated structure is etched to form the diffraction grating 3M, and a region in which the diffraction grating 3M is not formed and wider than the diffraction grating portion 301.
- the flat portion 302 is provided with the flat portion 302, and the flat portion 302 forms a waveguide 3L having a connecting portion 303 whose width changes continuously toward the connection portion with the diffraction grating portion 301 (waveviding path forming step).
- a protective film 35 of SiO 2 is formed so as to cover both sides of the waveguide 3L in the width direction.
- the semiconductor laser device 3 is formed. It is conceivable to form a plurality of semiconductor laser elements 3 on one semiconductor substrate 2.
- the upper electrodes 91 (91a, 91b) and the lower electrodes 92 for laser oscillation are formed on the semiconductor laser element 3. Further, the low reflection film AR is formed on one end surface of the diffraction grating portion 301, and the high reflection film HR is formed on one end surface of the flat portion.
- the semiconductor laser chip is formed by cutting the semiconductor substrate 2 for each region having the semiconductor laser element 3. This semiconductor laser chip is provided in the airtight container 5 in a state of being mounted on the cooling module 7.
- the high-reflection film HR is provided on the end surface of the flat portion 302 opposite to the connection portion 303
- the low-reflection film AR is provided on the end surface of the diffraction grating portion 301 on the side opposite to the connection portion 303.
- Light in a single mode can be stably output from the end face of the diffraction grating portion 301.
- the single mode property can be further improved.
- the first electrode 91a and the flat portion 302 for supplying a current to the diffraction grating portion 301 Since it has a second electrode 91b for supplying current, even if the total current (I flat + I DBF ) increases in order to obtain a high light output (gain), the current flowing through the region where the diffraction grating 3M is provided.
- the I DBF can be small. As a result, the temperature rise of the diffraction grating portion 301 can be suppressed, the chirp ratio can be reduced, and the resolution when used in the gas analyzer 10 can be improved.
- the plan view shape of the semiconductor laser element 3 is not limited to the above-described embodiment, and as shown in FIG. 7, both sides of the connecting portion 303 in the width direction may not be continuous with both sides of the rectangular portion 302s in the width direction. Specifically, both sides of the connecting portion 303 in the width direction are continuous with the end side 302a on the diffraction grating portion side of the rectangular portion 302s. Even in this case, it is desirable that the connection portion CP1 between the diffraction grating portion 301 and the connection portion 303 and / or the connection portion CP2 between the rectangular portion 302s and the connection portion 303 have an R shape.
- the shape of the connecting portion 303 is not limited to one having both sides in the width direction linear, and may be curved.
- the connection portion 303 has a configuration having a portion whose width gradually increases from the diffraction grating portion 301 toward the flat portion 302, the connection portion 303 has a constricted shape and the like, and the connection portion 303 faces the flat portion 302 from the diffraction grating portion 301. It may have a portion where the width is temporarily narrowed.
- the connecting portion 303 includes a tapered portion 303 m whose width is continuously narrowed toward the connection portion CP1 with the diffraction grating portion 301, and the tapered portion 303 m and the diffraction grating portion 301. It may be configured to have a narrow portion 303n to be connected.
- the upper electrode 91 has a two-electrode configuration of an electrode 91a for the diffraction grating portion and an electrode 91b for the flat portion, but it can also be used as a single electrode common to the diffraction grating portion 301 and the flat portion 302. good.
- the diffraction grating portion 301 and the flat portion 302 each have the same width, but at least one of the diffraction grating portion 301 or the flat portion 302 may have a configuration in which the width changes in the longitudinal direction. good.
- the flat portion 302 may have a configuration that does not have the rectangular portion 302s, and in this case, the flat portion 302 may have a tapered configuration in which the width continuously changes from one end to the other end.
- the drive method of the semiconductor laser element 3 may be a continuous oscillation (CW) method, a pseudo continuous oscillation (pseudo CW) method, or a pulse oscillation method.
- CW continuous oscillation
- pseudo CW pseudo continuous oscillation
- the distributed feedback type (DFB) semiconductor laser device has been described, but the present invention can also be applied to the distributed reflection type (DBR) semiconductor laser device.
- DBR distributed reflection type
- the semiconductor laser device 100 is applied to the gas analyzer 10
- it may be applied to other optical analyzers or may be used for optical communication applications.
- the analysis target is not limited to exhaust gas, but may be various gases such as gas generated in the semiconductor manufacturing process, gas of by-products in a material production plant, exhaled breath, gas generated from a battery, and the atmosphere. It may be a liquid or it may be a liquid.
Abstract
Description
この構成であれば、回折格子部に流れる電流と、平坦部に流れる電流とを独立して制御することができる。その結果、回路格子部に流れる電流を小さくすることができ、電流をパルス状に流した場合において発振波長が変化する割合であるチャープ率を小さくし、ガス分析装置に用いた場合の分解能を向上させることができる。
本実施形態の半導体レーザ装置100は、図1に示すように、例えば内燃機関から排出される排ガス中の測定対象成分を分析するガス分析装置10に用いられるものである。ここで、ガス分析装置10は、排ガスが導入される多重反射型の測定セル11と、測定セル11にレーザ光を照射する半導体レーザ装置100と、測定セル11を通過したレーザ光を検出する光検出器12と、光検出器12の検出信号を用いて測定対象成分を分析する分析部13とを有している。
しかして、本実施形態の半導体レーザ素子3において導波路3Lには、図4及び図5に示すように、回折格子3Mが形成された回折格子部301と、回折格子3Mが形成されていない平坦部302とを有している。
次に半導体レーザ装置100の製造方法について図6を参照して説明する。
このような半導体レーザ装置100であれば、幅の小さい回折格子部301と、幅の大きい平坦部302とを有するので、単一モード性を向上させつつ、レーザ光の光出力(利得)を大きくすることができる。また、平坦部302は、回折格子部301との接続箇所に向かうに連れて連続的に幅が変化する接続部303を有するので、意図しない反射を低減することができ、単一モードの光を安定して出力することができる。また、平坦部302における接続部303とは反対側の端面に高反射膜HRが設けられ、回折格子部301における接続部303とは反対側の端面に低反射膜ARが設けられているので、回折格子部301の端面から安定して単一モードの光を出力することができる。このように回折格子部301における接続部303とは反対側の端面が光射出面となることから、単一モード性をより一層向上することができる。
なお、本発明は前記実施形態に限られるものではない。
11・・・測定セル
12・・・光検出器
13・・・分析部
100・・・半導体レーザ装置
3L・・・導波路
3M・・・回折格子
2・・・半導体基板
3・・・半導体レーザ素子
301・・・回折格子部
302・・・平坦部
302s・・・矩形部
303・・・接続部
303m・・・テーパ部
303n・・・幅狭部
CP1・・・回折格子部と接続部との接続箇所
CP2・・・平坦部と接続部との接続箇所
3x・・・光射出面
HR・・・高反射膜
AR・・・低反射膜
91a・・・第1電極
91b・・・第2電極
Claims (12)
- 導波路上に回折格子を形成した半導体レーザ素子であって、
前記導波路は、
前記回折格子が形成された回折格子部と、
前記回折格子が形成されていない領域であって前記回折格子部よりも幅の広い領域を有する平坦部とを備え、
前記平坦部は、前記回折格子部との接続箇所に向かうに連れて連続的に幅が変化する領域を有する接続部を有しており、
前記平坦部における前記接続部とは反対側の端面に高反射膜が設けられ、前記回折格子部における前記接続部とは反対側の端面に低反射膜が設けられている、半導体レーザ素子。 - 前記接続部は、前記回折格子部との接続箇所に向かうに連れて連続的に幅が狭くなる、請求項1に記載の半導体レーザ素子。
- 前記接続部の最大の幅は、前記平坦部における前記接続部以外の部分の最大の幅以下であり、前記接続部の最小の幅は、前記回折格子部の最大の幅以上である、請求項1又は2に記載の半導体レーザ素子。
- 前記平坦部は、矩形状をなす矩形部と、前記接続部とを有する、請求項1乃至3の何れか一項に記載の半導体レーザ素子。
- 前記回折格子部と前記接続部との接続箇所、及び/又は、前記矩形部と前記接続部との接続箇所がR形状とされている、請求項4に記載の半導体レーザ素子。
- 前記接続部は、前記回折格子部との接続箇所に向かうに連れて連続的に幅が狭くなるテーパ部と、当該テーパ部及び前記回折格子部を繋げる幅狭部とを有する、請求項1乃至5の何れか一項に記載の半導体レーザ素子。
- 前記導波路の光出射端の幅寸法は、発振波長の1~2倍である、請求項1乃至6の何れか一項に記載の半導体レーザ素子。
- 前記回折格子が形成されていない領域の面積は、前記回折格子が形成された領域の面積以上である、請求項1乃至7の何れか一項に記載の半導体レーザ素子。
- 前記回折格子部に電流を供給するための第1電極と、
前記第1電極とは別に設けられ、前記平坦部に電流を供給するための第2電極とを有する、請求項1乃至8の何れか一項に記載の半導体レーザ素子。 - 基板と、前記基板上に設けられた半導体レーザ素子とを備える半導体レーザ装置であって、
前記半導体レーザ素子は、請求項1乃至9の何れか一項に記載のものである、半導体レーザ装置。 - 導波路上に回折格子を形成した半導体レーザ装置の製造方法であって、
基板上に、前記回折格子が形成された回折格子領域と前記回折格子が形成されない平坦領域とを有する積層構造体を形成する構造体形成工程と、
前記積層構造体をエッチングして、前記回折格子が形成された回折格子部と、前記回折格子が形成されていない領域であって前記回折格子部よりも幅の広い領域を有する平坦部とを備え、前記平坦部は、前記回折格子部との接続箇所に向かうに連れて連続的に幅が変化する領域を有する接続部を有する導波路を形成する導波路形成工程とを備える、半導体レーザ装置の製造方法。 - サンプルに含まれる測定対象成分を分析する分析装置であって、
前記サンプルが導入される測定セルと、
前記測定セルにレーザ光を照射する請求項10記載の半導体レーザ装置と、
前記測定セルを通過したレーザ光を検出する光検出器と、
前記光検出器の検出信号を用いて前記測定対象成分を分析する分析部とを有する、分析装置。
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- 2021-12-02 WO PCT/JP2021/044328 patent/WO2022124197A1/ja active Application Filing
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